Configuring the 2-Port and 4-Port T3/E3 Serial SPA

This chapter provides information about configuring the 2-Port, 4-Port, and 8-Port Clear-Channel T3/E3 Serial SPAs on the Cisco ASR 1000 Series Routers.

Configuration Tasks

This section describes how to configure the 2-Port, 4-Port, and 8-Port Clear-Channel T3/E3 Serial SPAs for the Cisco ASR 1000 Series Routers and verify the configuration. For information about managing your system images and configuration files, refer to the following:

Required Configuration Tasks

This section lists the required configuration steps to configure the 2-Port and 4-Port T3/E3 Serial SPA. Some of the required configuration commands implement default values that might be appropriate for your network. If the default value is correct for your network, then you do not need to configure the command.


Note
To better understand the address format used to specify the physical location of the SIP, SPA, and interfaces, see the Specifying the Interface Address on a SPA.

Setting the Card Type

The SPA is not functional until the card type is set. Information about the SPA is not indicated in the output of any show commands until the card type has been set. There is no default card type.


Note
The card type command is not required to set the serial mode for the 8-Port Clear-Channel T3/E3 SPA. Therefore, this command is not supported in the 8-Port Clear-Channel T3/E3 SPA. This SPA supports both T3 and E3 configurations at the port level, which can be changed without reloading the SPA. The framing type that is configured determines whether a port is in the T3 mode or E3 mode. During first time initialization, by default, all the ports of the 8-Port Clear Channel T3/E3 SPA come up in the T3 mode and C-bit framing. For subsequent reloads, the ports come up in the modes they were configured and saved in. For more information on mixed interface types, see the Configuring Framing.

To set the card type for the 2-Port and 4-Port T3/E3 Clear-Channel Serial SPAs, complete these steps:

SUMMARY STEPS

    1.    Router# configure terminal

    2.    Router(config)# card type {t3 | e3} slot subslot

    3.    Router(config)# exit


DETAILED STEPS
     Command or ActionPurpose
    Step 1 Router# configure terminal 

    Enters global configuration mode.

     
    Step 2 Router(config)# card type {t3 | e3} slot subslot  

    Sets the serial mode for the SPA:

    • t3—Specifies T3 connectivity of 44210 kbps through the network, using B3ZS coding.
    • e3—Specifies a wide-area digital transmission scheme used predominantly in Europe that carries data at a rate of 34010 kbps.
    • slot subslot —Specifies the location of the SPA. See the Specifying the Interface Address on a SPA.
     
    Step 3 Router(config)# exit 

    Exits configuration mode and returns to the EXEC command interpreter prompt.

     

    Setting the IP Address

    To set the IP address for the 2-Port and 4-Port T3/E3 Serial SPA, complete these steps:

    SUMMARY STEPS

      1.    Router(config)# interface serial slot/subslot/port

      2.    Router(config-if)# ip address address mask

      3.    Router(config-if)# clock source {internal | line}

      4.    Router(config-if)# no shut

      5.    Router(config)# exit


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 Router(config)# interface serial slot/subslot/port  

      Selects the interface to configure and enters interface configuration mode.

       
      Step 2 Router(config-if)# ip address address mask 

      Sets the IP address and subnet mask.

      • address—IP address.
      • mask—Subnet mask.
       
      Step 3 Router(config-if)# clock source {internal | line} 

      Sets the clock source.

      • internal—Specifies that the internal clock source is used.
      • line—Specifies that the network clock source is used. This is the default.
       
      Step 4 Router(config-if)# no shut 

      Enables the interface.

       
      Step 5 Router(config)# exit 

      Exits interface configuration mode and returns to the EXEC command interpreter prompt.

       

      Verifying Controller Configuration

      Use the show controllers command to verify the controller configuration:

      Router# show controllers serial 2/0/0
Serial2/0/0 - 
   Framing is c-bit, Clock Source is Line
   Bandwidth limit is 44210, DSU mode 0, Cable length is 10
   rx FEBE since last clear counter 2, since reset 0
   Data in current interval (546 seconds elapsed):
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
  Data in Interval 1:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
Data in Interval 44:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     560 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
   Total Data (last 44 15 minute intervals):
     0 Line Code Violations, 0 P-bit Coding Violation, 
     0 C-bit Coding Violation,
     0 P-bit Err Secs, 0 P-bit Sev Err Secs,
     0 Sev Err Framing Secs, 0 Unavailable Secs,
     24750 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
   Transmitter is sending AIS.
   Receiver has loss of signal.
    40434 Sev Err Line Secs, 0 Far-End Err Secs, 0 Far-End Sev Err Secs
    0 P-bit Unavailable Secs, 0 CP-bit Unavailable Secs
    0 CP-bit Far-end Unavailable Secs
    0 Near-end path failures, 0 Far-end path failures
   No FEAC code is being received
  MDL transmission is disabled

      Use the show controllers brief command to view a subset of the show controllers output:

      Router# show controllers serial 2/0/2 brief
Serial2/0/2 - 
   Framing is c-bit, Clock Source is Internal
   Bandwidth limit is 44210, DSU mode 0, Cable length is 10
   rx FEBE since last clear counter 0, since reset 22
   No alarms detected.
   No FEAC code is being received
  MDL transmission is disabled

      Verifying the Interface Configuration

      Use the show interfaces command to verify the interface configuration:

      Router# show interfaces serial 2/0/0
Serial2/0/0 is up, line protocol is up 
  Hardware is SPA-4T3E3
  MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, 
     reliability 255/255, txload 12/255, rxload 56/255
  Encapsulation FRAME-RELAY, crc 16, loopback not set
  Keepalive set (10 sec)
  LMI enq sent  13477, LMI stat recvd 13424, LMI upd recvd 0, DTE LMI up
  LMI enq recvd 19, LMI stat sent  0, LMI upd sent  0
  LMI DLCI 1023  LMI type is CISCO  frame relay DTE
  FR SVC disabled, LAPF state down
  Broadcast queue 0/256, broadcasts sent/dropped 0/0, interface broadcasts 0
  Last input 00:00:09, output 00:00:09, output hang never
  Last clearing of "show interface" counters 1d13h
  Input queue: 0/75/3/3891 (size/max/drops/flushes); Total output drops: 5140348
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 9716000 bits/sec, 28149 packets/sec
  5 minute output rate 2121000 bits/sec, 4466 packets/sec
     14675957334 packets input, 645694448563 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicast)
     0 runts, 0 giants, 0 throttles
              0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     14562482078 packets output, 640892196653 bytes, 0 underruns
     0 output errors, 0 applique, 4 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
   rxLOS inactive, rxLOF inactive, rxAIS inactive
   txAIS inactive, rxRAI inactive, txRAI inactive
Serial2/0/0.16 is up, line protocol is up 
  Hardware is SPA-4T3E3
  Internet address is 110.1.1.2/24
  MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, 
     reliability 255/255, txload 11/255, rxload 53/255
  Encapsulation FRAME-RELAY

      Specifying the Interface Address on a SPA

      SPA interface ports begin numbering with “0” from left to right. Single-port SPAs use only the port number 0. To configure or monitor SPA interfaces, you need to specify the physical location of the SIP, SPA, and interface in the CLI. The interface address format is slot/subslot/port, where:

      • slot—Specifies the chassis slot number in the Cisco ASR 1000 Series Aggregation Services Routers where the SIP is installed.
      • subslot—Specifies the slot of the SIP where the SPA is installed.
      • port—Specifies the number of the individual interface port on a SPA.

      The following example shows how to specify the first interface (0) on a SPA installed in the first subslot of a SIP (0) installed in chassis slot 2:

      Router(config)# interface serial 2/0/0

      This command shows a serial SPA as a representative example, however the same slot/subslot/port format is similarly used for other SPAs (such as ATM and POS) and other non-channelized SPAs.

      For more information about identifying slots and subslots, see the Required Configuration Tasks.

      Optional Configurations

      There are several standard, but optional configurations, that might be necessary to complete the configuration of your serial SPA.

      Configuring Data Service Unit Mode

      Configure the SPA to connect with customer premises Data Service Units (DSUs) by setting the DSU mode. Subrating a T3 or E3 interface reduces the peak access rate by limiting the data transfer rate.

      To configure the DSU mode and bandwidth, use the following commands:

      Command

      Purpose

      Router# configure terminal

      Enters global configuration mode.

      Router(config)# interface serial slot/subslot/port

      Selects the interface to configure and enters interface configuration mode.

      T3

      Router(config-if)# dsu mode {0 | 1 | 2 | 3 | 4}

      E3

      Router(config-if)# dsu mode {0 | 1}

      Specifies the interoperability mode used by a T3 controller.

      • 0—Connects a T3/E3 controller to another T3/E3 controller or to a Digital Link DSU (DL3100 in T3 mode and DL3100E in E3 mode). This is the default.
      • 1—Connects a T3/E3 controller to a Kentrox DataSMART T3/E3 IDSU.
      • 2—Connects a T3 controller to a Larscom Access-T45 DS3 DSU.
      • 3—Connects a T3 controller to an Adtran T3SU 300.
      • 4—Connects a T3 controller to a Verilink HDM 2182.

      Router(config-if)# dsu bandwidth kbps

      Specifies the allowable bandwidth.

      • kbps—The bandwidth range and increment values are based on the specific DSU. Default for T3 mode is 44010 kbps and 34010 kbps for E3 mode.
        • Digital Link DL3100 bandwidth range is 300 to 44210 kbps.
        • Digital Link DL3100E bandwidth range is 358 to 34010 kbps.
        • Kentrox DataSMART T3/E3 IDSU bandwidth range is 1000 to 34000 kbps for E3 mode and 1500 to 44210 kbps for T3 mode.
        • Larscom Access-T45 DS3 bandwidth range is 3100 to 44210 kbps.
        • Adtran T3SU 300 bandwidth range is 80 to 44210 kbps.
        • Verilink HDM 2182 bandwidth range is 1600 to 31600 kbps.

      Router(config-if)# remote {accept | fullrate}

      Specifies where the DSU bandwidth is set.

      • accept—Accepts incoming remote requests to reset the DSU bandwidth.
      • fullrate—Sets far end DSU to its fullrate bandwidth.
      Verifying DSU Mode

      Use the show controllers serial command to display the DSU mode of the controller:

      Router# show controllers serial 2/0/0
Serial2/0/0 - 
   Framing is c-bit, Clock Source is Line
   Bandwidth limit is 44210, DSU mode 0, Cable length is 10
   rx FEBE since last clear counter 2, since reset 0
   Data in current interval (546 seconds elapsed):
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
  Data in Interval 1:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs

      Configuring Maintenance Data Link

      MDL messages are used to communicate identification information between local and remote ports. The type of information included in MDL messages includes the equipment identification code (EIC), location identification code (LIC), frame identification code (FIC), unit, Path Facility Identification (PFI), port number, and Generator Identification numbers.


      Note
      C-bit framing must be enabled in order to transport MDL messages between source and destination T3 ports.

      To configure Maintenance Data Link (MDL), use the following commands.

      Command

      Purpose

      Router# configure terminal

      Enters global configuration mode.

      Router(config)# interface serial slot/subslot/port

      Selects the interface to configure.

      Router(config-if)# mdl [string {eic | fic | generator | lic | pfi | port | unit} string}] | [transmit {idle-signal | path | test-signal}]

      Configures the Maintenance Data Link (MDL) message.

      • eic string—Specifies the Equipment Identification Code (up to 10 characters), which is a value used to describe a specific piece of equipment according to ANSI T1.107-1995.
      • fic string—Specifies the Frame Identification Code (up to 10 characters), which is a value used to identify where the equipment is located within a building at a given location according to ANSI T1.107-1995.
      • generator string—Specifies the Generator number string sent in the MDL Test Signal message; can be up to 38 characters.
      • lic string—Specifies the Location Identification Code (up to 11 characters), which is a value used to describe a specific location according to ANSI T1.107-1995.
      • pfi string—Specifies the Path Facility Identification Code sent in the MDL Path message; can be up to 38 characters.
      • port string—Specifies the port number string sent in the MDL Idle Signal message; can be up to 38 characters.
      • unit string—Specifies the Unit Identification Code (up to 6 characters), which is a value that identifies the equipment location within a subslot according to ANSI T1.107-1995.
      • transmit idle-signal—Enables transmission of the MDL Idle-Signal message. An MDL Idle-Signal message, as defined by ANSI T1.107, is distinguished from path and test signal messages in that it contains a port number as its final data element.
      • transmit path—Enables transmission of the MDL Path message. An MDL Path message, as defined by ANSI T1.107, is distinguished from idle and test signal messages in that it contains a facility identification code as its final data element.
      • transmit test-signal—Enables transmission of the MDL Test-Signal message. An MDL Test-Signal message, as defined by ANSI T1.107, is distinguished from path and idle signal messages in that it contains a generator number as its final data element.
      Verifying MDL

      Use the show controllers serial command to display the MDL settings:

      Router# show controllers serial 2/0/0
Serial2/0/0 - 
   Framing is c-bit, Clock Source is Line
   Bandwidth limit is 44210, DSU mode 0, Cable length is 10
   rx FEBE since last clear counter 2, since reset 0
   Data in current interval (546 seconds elapsed):
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
  Data in Interval 1:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
  Data in Interval 96:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
   Total Data (last 24 hours)
     0 Line Code Violations, 0 P-bit Coding Violation, 
     0 C-bit Coding Violation,
     0 P-bit Err Secs, 0 P-bit Sev Err Secs,
     0 Sev Err Framing Secs, 0 Unavailable Secs,
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
   No alarms detected.
    0 Sev Err Line Secs, 1 Far-End Err Secs, 0 Far-End Sev Err Secs
    0 P-bit Unavailable Secs, 0 CP-bit Unavailable Secs
    0 CP-bit Far-end Unavailable Secs
    0 Near-end path failures, 0 Far-end path failures
No FEAC code is being received
  MDL transmission is enabled
     EIC: tst, LIC: 67, 
     Test Signal GEN_NO: test
  Far-End MDL Information Received
     EIC: tst, LIC: 67, 
     Test Signal GEN_NO: test

      Configuring Scramble

      T3/E3 scrambling is used to assist clock recovery on the receiving end. Scrambling is designed to randomize the pattern of 1s and 0s carried in the physical layer frame. Randomizing the digital bits can prevent continuous, nonvariable bit patterns—in other words, long strings of all 1s or all 0s. Several physical layer protocols rely on transitions between 1s and 0s to maintain clocking.

      Scrambling can prevent some bit patterns from being mistakenly interpreted as alarms by switches placed between the Data Service Units (DSUs).

      To configure scrambling, use the following commands:

      Command

      Purpose

      Router# configure terminal

      Enters global configuration mode.

      Router(config)# interface serial slot/subslot/port

      Selects the interface to configure and enters interface configuration mode.

      Router(config-if)# [no] scramble

      Enables scrambling. Scrambling is disabled by default.

      • scramble—Enables scramble.
      • no scramble—Disables scramble.
      Note    When using framing bypass, no scrambling must be configured.
      Verifying Scramble Configuration

      Use the show controllers serial command to display the scrambling setting:

      Router# show controllers serial 2/0/0
Serial2/0/0 - 
   Framing is c-bit, Clock Source is Line
   Bandwidth limit is 44210, DSU mode 0, Cable length is 10
   rx FEBE since last clear counter 2, since reset 0
   Scrambling is enabled
   Data in current interval (356 seconds elapsed):
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
  Data in Interval 1:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs

      Configuring Framing

      Framing is used to synchronize data transmission on the line. Framing allows the hardware to determine when each packet starts and ends. To configure framing, use the following commands:

      Command

      Purpose

      Router# configure terminal

      Enters global configuration mode.

      Router(config)# interface serial slot/subslot/port

      Selects the interface to configure and enters interface configuration mode.

      T3

      Router(config-if)# framing {bypass | c-bit | m13}

      E3

      Router(config-if)# framing {bypass | g751| g832}

      8-Port Clear-Channel T3/E3 SPA

      Router(config-if)# framing {bypass-ds3 | bypass-e3 | c-bit | m13 | g751 | g832}

      Sets the framing on the interface.

      • bypass—Configures framing bypass to use the full T3 or E3 bandwidth.
      • bypass-ds3—Configures framing bypass to use the full T3 bandwidth.
      • bypass-e3—Configures framing bypass to use the full E3 bandwidth.
      • c-bit—Specifies C-bit parity framing. This is the default for T3.
      • m13—Specifies M13 framing.
      • g751— Specifies G751 framing. This is the default for E3.
      • g832—Specifies G832 framing.

      The following table determines the T3 or E3 mode of the interface based on the framing type configured:

      Table 1 Framing Type and the Interface T3/E3 Mode

      Framing Type

      Interface T3/E3 Mode

      bypass-ds3

      T3

      c-bit

      T3

      m13

      T3

      bypass-e3

      E3

      g751

      E3

      g832

      E3
      Verifying Framing Configuration

      Use the show controllers serial command to display the framing method:

      Router# show controllers serial 2/0/0
Serial2/0/0 - 
   Framing is c-bit, Clock Source is Line
   Bandwidth limit is 44210, DSU mode 0, Cable length is 10
   rx FEBE since last clear counter 2, since reset 0
   Data in current interval (546 seconds elapsed):
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
  Data in Interval 1:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs

      Configuring Encapsulation

      When traffic crosses a WAN link, the connection needs a Layer 2 protocol to encapsulate traffic. To set the encapsulation method, use the following commands:

      Command

      Purpose

      Router# configure terminal

      Enters global configuration mode.

      Router(config)# interface serial slot/subslot/port:channel-group

      Selects the interface to configure.

      Router(config-if)# encapsulation encapsulation-type {hdlc | ppp | frame-relay}

      Sets an encapsulation type on the interface:

      • hdlc—High-Level Data Link Control (HDLC) protocol for serial interface. This encapsulation method provides the synchronous framing and error detection functions of HDLC without windowing or retransmission. This is the default for synchronous serial interfaces.
      • ppp—PPP (for serial interface).
      • frame-relay—Frame Relay (for serial interface).
      Verifying Encapsulation

      Use the show interfaces serial command to verify encapsulation on the interface: 

      Router# show interfaces serial 2/0/0:0
Serial2/0/0:0 is down, line protocol is down 
  Hardware is SPA-8XCHT1/E1
  MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, crc 32, loopback not set
  Keepalive set (10 sec)
  LCP Closed, multilink Closed
  Last input 1w0d, output 1w0d, output hang never
  Last clearing of show interfaceunters 6d23h
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops) 
     Conversations  0/0/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1152 kilobits/sec
  30 second input rate 0 bits/sec, 0 packets/sec
  30 second output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions alarm present
  Timeslot(s) Used:1-24, subrate: 64Kb/s, transmit delay is 0 flags

      Configuring Cable Length

      The cablelength command compensates for the loss in decibels based on the distance from the device to the first repeater in the circuit. A longer distance from the device to the repeater requires that the signal strength on the circuit be boosted to compensate for loss over that distance. To configure cable length, use the following commands:

      Command

      Purpose

      Router# configure terminal

      Enters global configuration mode.

      Router(config)# interface serial slot/subslot/port

      Selects the interface to configure and enters interface configuration mode.

      Router(config-if)# cablelength length

      Sets the cable length.

      • length—Range is 0 to 450 feet. The default is 10 feet.
      Verifying Cable Length Setting

      Use the show interfaces serial command to verify the cable length setting:

      Router# show interfaces serial 2/0/0
Serial2/0/0 - 
   Framing is c-bit, Clock Source is Internal
   Bandwidth limit is 44210, DSU mode 0, Cable length is 200
   rx FEBE since last clear counter 0, since reset 22
   Data in current interval (446 seconds elapsed):
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
  Data in Interval 1:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
  Data in Interval 2:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs

      Configuring Invert Data

      Delays between the terminal equipment (TE) clock and data transmission indicate that the transmit clock signal might not be appropriate for the interface rate and length of cable being used. Different ends of the wire may have variances that differ slightly. Invert the clock signal to compensate for these factors. To configure invert data, use the following commands:

      Command

      Purpose

      Router# configure terminal

      Enters global configuration mode.

      Router(config)# interface serial slot/subslot/port

      Selects the interface to configure and enters interface configuration mode.

      Router(config-if)# invert data

      Inverts the data stream.
      Verifying Invert Data Setting

      Use the show running configuration command to verify that invert data was set on the interface:

      Router# show running configuration
interface Serial2/0/0
 ip address 51.1.1.1 255.255.255.0
 logging event link-status
 dsu bandwidth 44210
 framing c-bit
 cablelength 10
 clock source internal
 invert data
 mdl string eic tst
 mdl string lic 67
 mdl string generator test
 mdl transmit path
 mdl transmit test-signal
 no cdp enable
!

      Configuring the Trace Trail Buffer

      Configure Trace Trail Buffer (TTB) to send messages to the remote device. The TTB messages check for the continued presence of the transmitter. To configure TTB, use the following commands:

      Command

      Purpose

      Router# configure terminal

      Enters global configuration mode.

      Router(config)# interface serial slot/subslot/port

      Selects the interface to configure and enters interface configuration mode.

      Router(config-if)# ttb {country | rnode | serial | snode | soperator | x} string

      Sends a Trace Trail Buffer message in E3 g.832 framing mode.

      • country—Two character country code.
      • rnode—Receive node code.
      • serial—M.1400 serial.
      • snode—Sending location/Node ID code.
      • soperator—Sending operator code (must be numeric).
      • x—X0.
      • string—TTB message.
      Verifying TTB Settings

      Use the show controllers serial command to display the TTB settings for the interface:

      Router# show controllers serial 2/0/0
Serial2/0/0 - 
   Framing is c-bit, Clock Source is Line
   Bandwidth limit is 44210, DSU mode 0, Cable length is 10
   rx FEBE since last clear counter 2, since reset 0
   Data in current interval (546 seconds elapsed):
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
  Data in Interval 1:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
No alarms detected. 
TTB transmission is disabled
TTB Rx: country: us soperator: s snode: sn rnode: rn x: x serial: 1

      Configuring QoS Features on Serial SPAs

      The SIPs and SPAs support many QoS features using modular QoS CLI (MQC) configuration. Since there are no serial SPA-specific QoS features, refer to your network processor documentation for QoS configuration information.

      Saving the Configuration

      To save your running configuration to nonvolatile random-access memory (NVRAM), use the following command in privileged EXEC configuration mode:

      Command

      Purpose

      Router# copy running-config startup-config

      Writes the new configuration to NVRAM.

      For information about managing your system images and configuration files, refer to the Cisco IOS Configuration Fundamentals Configuration Guide and Cisco IOS Configuration Fundamentals Command Reference publications for your Cisco IOS software release.

      Verifying the Interface Configuration

      Besides using the show running-configuration command to display the configuration settings of your Cisco ASR 1000 Series Routers, use the show interfaces serial command and the show controllers serial command to get detailed information on a per-port basis for your 2-Port and 4-Port T3/E3 Serial SPA.

      Verifying the Per-Port Interface Status

      To find detailed interface information on a per-port basis for the 2-Port and 4-Port T3/E3 Serial SPA, use the show interfaces serial command.

      The following example provides sample output for interface port 1 on the SPA located in the first subslot of the SIP installed in slot 2 of a Cisco ASR 1000 Series Routers: 

      Router# show interface serial 2/0/1

Serial2/0/1 is up, line protocol is up 
  Hardware is SPA-4T3E3
  Internet address is 120.1.1.1/24
  MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, 
     reliability 255/255, txload 234/255, rxload 234/255
  Encapsulation HDLC, crc 16, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:00, output 00:00:01, output hang never
  Last clearing of show interface counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 40685000 bits/sec, 115627 packets/sec
  5 minute output rate 40685000 bits/sec, 115624 packets/sec
     4652915554 packets input, 204728203496 bytes, 0 no buffer
     Received 4044 broadcasts (0 IP multicast)
     130 runts, 0 giants, 0 throttles
              0 parity
     1595 input errors, 543 CRC, 0 frame, 0 overrun, 0 ignored, 922 abort
     4653081242 packets output, 204735493748 bytes, 0 underruns
     0 output errors, 0 applique, 4 interface resets
     0 output buffer failures, 0 output buffers swapped out
     2 carrier transitions

      Monitoring the Per-Port Interface Statistics

      To find detailed status and statistical information on a per-port basis for the 2-Port and 4-Port T3/E3 Serial SPA, use the show controllers serial command.

      The following example provides sample output for interface port 1 on the SPA located in the first subslot of the SIP that is installed in slot 2 of the Cisco ASR 1000 Series Routers:

      Router# show controllers serial 2/0/2
Serial2/0/2 - 
   Framing is c-bit, Clock Source is Line
   Bandwidth limit is 44210, DSU mode 0, Cable length is 10
   rx FEBE since last clear counter 0, since reset 0
   Data in current interval (807 seconds elapsed):
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 306 Unavailable Secs
     500 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
  Data in Interval 1:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     564 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
  Data in Interval 2:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     564 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
  Data in Interval 3:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     562 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
  Data in Interval 4:
     0 Line Code Violations, 0 P-bit Coding Violation
     0 C-bit Coding Violation
     0 P-bit Err Secs, 0 P-bit Sev Err Secs
     0 Sev Err Framing Secs, 0 Unavailable Secs
     560 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
Total Data (last 44 15 minute intervals):
     0 Line Code Violations, 0 P-bit Coding Violation, 
     0 C-bit Coding Violation,
     0 P-bit Err Secs, 0 P-bit Sev Err Secs,
     0 Sev Err Framing Secs, 0 Unavailable Secs,
     24750 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
   Transmitter is sending AIS.
   Receiver has loss of signal.
    40434 Sev Err Line Secs, 0 Far-End Err Secs, 0 Far-End Sev Err Secs
    0 P-bit Unavailable Secs, 0 CP-bit Unavailable Secs
    0 CP-bit Far-end Unavailable Secs
    0 Near-end path failures, 0 Far-end path failures
   No FEAC code is being received
  MDL transmission is disabled

      Configuration Examples

      This section includes the following configuration examples:

      DSU Configuration Example

      The following example configures DSU on interface port 0 on slot 2, subslot:

      ! Specify the serial interface and enter interface configuration mode
! 
Router(config)# interface serial 2/1/0
!
! Specify the DSU mode
!
Router(config-if)# dsu mode 0
!
! Specify the DSU bandwidth
!
Router(config-if)# dsu bandwidth 10000
!
! Set the DSU bandwidth to accept or reject the incoming remote requests
!
Router(config-if)# dsu remote accept

      MDL Configuration Example

      The following example configures the MDL strings on interface port 0 on slot 2, subslot 1:

      ! Specify the serial interface and enter interface configuration mode
!
Router(config)# interface serial 2/1/0
!
! Specify the MDL strings
!
Router(config-if)# mdl string eic beic
Router(config-if)# mdl string lic beic
Router(config-if)# mdl string fic bfix
Router(config-if)# mdl string unit bunit
Router(config-if)# mdl string pfi bpfi
Router(config-if)# mdl string port bport
Router(config-if)# mdl string generator bgen
Router(config-if)# mdl transmit path
Router(config-if)# mdl transmit idle-signal
Router(config-if)# mdl transmit test-signal

      Scrambling Configuration Example

      The following example shows how to configure scrambling on the T3/E3 interface:

      ! Enter global configuration mode
!
Router# configure terminal
!
! Specify the serial interface and enter interface configuration mode
!
Router(config)# interface serial 2/1/3
!
! Enable scrambling
!
Router(config-if)# scramble

      Framing Configuration Example

      The following example shows how to configure framing on interface port 1 on slot 2, subslot 1:

      Specify the serial interface and enter interface configuration mode
!
Router(config)# interface serial 2/1/1
!
Specify the framing method
!
Router(config-if)# framing m13

      The following example shows how to configure the Port 0 of the 8-Port Clear-Channel T3/E3 SPA to be a T3 port with m13 framing:

      Router(config)# interface serial 2/1/0
Router(config-if)# framing m13

      The following example shows how to configure the Port 1 of the 8-Port Clear-Channel T3/E3 SPA to be a E3 port with g832 framing:

      Router(config)# interface serial 2/1/1
Router(config-if)# framing g832

      Encapsulation Configuration Example

      The following example shows how to configure encapsulation on interface port 1 on slot 2, subslot 1:

      ! Specify the serial interface and enter interface configuration mode
!
Router(config)# interface serial 2/1/1
!
! Specify the encapsulation method
!
Router(config-if)# encapsulation PPP

      Cable Length Configuration Example

      The following example shows how to set the cable length to 200 feet:

      ! Enter global configuration mode
!
Router# configure terminal
!
! Specify the serial interface and enter interface configuration mode
!
Router(config)# interface serial 2/1/3
!
! Specify the cable length
!
Router(config-if)# cablelength 200

      Invert Data Configuration Example

      The following example shows how to enable invert data:

      ! Enter global configuration mode
!
Router# configure terminal
!
! Specify the serial interface and enter interface configuration mode
!
Router(config)# interface serial 2/1/3
!
! Enable invert data
!
Router(config-if)# invert data

      Trace Trail Buffer Configuration Example

      The following example shows how to configure the TTB attributes:

      ! Enter global configuration mode
!
Router# configure terminal
!
! Specify the serial interface and enter interface configuration mode
!
Router(config)# interface serial 2/1/3
!
! Specify the TTB attributes
!
Router(config-if)# ttb country abRouter(config-if)# ttb soperator 56Router(config-if)# ttb snode 34Router(config-if)# ttb rnode cdRouter(config-if)# ttb x 7Router(config-if)# ttb serial 12