Cisco IOS Interface and Hardware Component Configuration Guide, Release 12.4
PA-MC-2T3+ Phase-II (T3 subrate)
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Table Of Contents

PA-MC-2T3+ Phase-II (T3 subrate)

Feature Overview

Benefits

Restrictions

Related Features and Technologies

Related Documents

Supported Platforms

Supported Standards, MIBs, and RFCs

Configuration Tasks

Configuring the T3 Controller

Configuring the Serial Interface

Verifying the Configuration

Troubleshooting Tips

Monitoring and Maintaining the PA-MC-2T3+

Configuration Examples

Configuring a T3 Controller Example

Configuring a Full-Rate T3 Interface Example

Configuring a Subrate T3 Interface Example

Command Reference


PA-MC-2T3+ Phase-II (T3 subrate)

Feature History

Release
Modification

12.1(5a)E

This feature was introduced.

12.2(13)T

This feature was integrated into Cisco IOS Release 12.2(13)T.

12.2(14)S

This feature was integrated into Cisco IOS Release 12.2(14)S.


This feature module describes the availability of clear channel (T3 subrate) on the two-port enhanced multichannel T3 port adapter (PA-MC-2T3+). It includes information on the benefits of this new feature, supported platforms, configuration examples, and a command reference.

This document contains the following sections:

•Feature Overview

•Supported Platforms

•Supported Standards, MIBs, and RFCs

•Configuration Tasks

•Monitoring and Maintaining the PA-MC-2T3+

•Configuration Examples

•Command Reference

Feature Overview

The PA-MC-2T3+ is a single-width port adapter that provides two T3 interface connections. Each T3 interface can now be independently configured to be either channelized or unchannelized. A channelized T3 provides 28 T1 lines multiplexed into the T3. Each T1 line can be configured into one or more serial interface data channels.

Using the no channelized command, you can configure the T3 as a single, unchannelized serial interface data channel. You can configure this data channel to use all of the T3 bandwidth or a portion of it.

Benefits

The PA-MC-2T3+ now provides the following benefits:

•Two T3 ports each with integrated CSU/DSUs

•Two T3 ports on one single-wide port adapter

•Up to 256 logical, T1 n x 56K and n x 64K channels

•28 T1 ports multiplexed into a single T3 connection

•Channelized T1, fractional T1, and full-rate T1 support

•Subrate and full rate T3 support

•Line and payload loopback capabilities

•Full bit error rate testing on any T1 or any unchannelized T3

•DSX-3 level interface

•Full duplex and connectivity at DS3 rate (44.736 Mbps)

•T3 Scrambling and subrate can be independently or simultaneously enabled in each DSU mode

•C-bit or M13 framing

•B3ZS line coding

•DS3 FEAC channel support

•Support for Frame Relay, PPP, HDLC, SMDS DXI, and X.25

Restrictions

The PA-MC-2T3+ does not support the following:

•More than 128 channels per T3

•Use of unused channels of one T3 by the other T3

Related Features and Technologies

•PA-MC-T3

•PA-2T3+

•PA-MC-2T3+ Phase I

Related Documents

PA-MC-2T3+ Multi-Channel T3 Port Adapter Installation and Configuration

Supported Platforms

•Cisco 7200 series

•Cisco 7500 series

Determining Platform Support Through Cisco Feature Navigator

Cisco IOS software is packaged in feature sets that are supported on specific platforms. To get updated information regarding platform support for this feature, access Cisco Feature Navigator. Cisco Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.

Cisco Feature Navigator is a web-based tool that enables you to determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or release. Under the release section, you can compare releases side by side to display both the features unique to each software release and the features in common.

To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:

http://www.cisco.com/register

Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Cisco Feature Navigator home page at the following URL:

http://www.cisco.com/go/fn

Availability of Cisco IOS Software Images

Platform support for particular Cisco IOS software releases is dependent on the availability of the software images for those platforms. Software images for some platforms may be deferred, delayed, or changed without prior notice. For updated information about platform support and availability of software images for each Cisco IOS software release, refer to the online release notes or, if supported, Cisco Feature Navigator.

Supported Standards, MIBs, and RFCs

Standards

•ANSI T1.102

•ANSI T1.107

•ANSI T1.403

•ANSI T1.404

•AT&T 62411

•AT&T 54016

•AT&T 54014

•AT&T TR-NWO-00499

•FCC Part 68

•FCC Part 15, Class A

•UL1950 3rd Edition/CSA C22.2, No. 950

MIBs

No new or modified MIBs are supported by this feature.

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://tools.cisco.com/ITDIT/MIBS/servlet/index

If Cisco MIB Locator does not support the MIB information that you need, you can also obtain a list of supported MIBs and download MIBs from the Cisco MIBs page at the following URL:

http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml

To access Cisco MIB Locator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:

http://www.cisco.com/register

RFCs

•RFC 1406, Definitions of Managed Objects for the DS1 and E1 Interface Types

•RFC 1407, Definitions of Managed Objects for the DS3/E3 Interface Type

Configuration Tasks

See the following sections for configuration tasks for the T3 subrate feature. Each task in the list is identified as either required or optional.

•Configuring the T3 Controller (required)

•Configuring the Serial Interface (required)

•Verifying the Configuration (optional)

Configuring the T3 Controller

 
Command
Purpose

Step 1 

Cisco 7200 series routers 

Router(config)# controller T3 chassis-slot/T3-port

Cisco 7500 series routers

Router(config)# controller T3 interface-processor-slot/port-adapter-slot/T3-port

Select the T3 controller you want to configure.

Step 2 

Router(config-controller)# no channelized 


Change to subrate mode will cause cbus complex reset. 
Proceed? [yes/no]: Y

Configures unchannelized mode for the T3 controller.

When the PA-MC-2T3+ is configured for unchannelized T3 mode, the default MTU size is set to 4470 for compatibility with other T3 equipment and port adapters.

The change in MTU sizes will cause a memory recarve and CBus complex to occur, disrupting all traffic on the router for several minutes. (This occurs only on Cisco 7500 series routers.)

Type Y for "yes" at the end of the warning. At the prompt, type ^Z to exit. You will exit configuration mode, and enter unchannelized mode.

Step 3  

Router(config-controller)# bert pattern pattern 
interval time

Sends a BERT pattern on the T3 line to test cable and signal problems in the field.

•pattern:

–0s, repetitive test pattern of all zeros (00000)

–1s, repetitive test pattern of all ones (11111)

–2^15, pseudorandom 0.151 test pattern (32,768 bits long)

–2^20, pseudorandom 0.151 test pattern (1,046,575 bits long)

–2^23, pseudorandom 0.151 test pattern (8,388,607 bits long)

–alt-0-1, repetitive alternating test pattern of zeros (0s) and ones (1s), (01010101)

•time—1-14400 minutes

Step 4  

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

Configures Maintenance Data Link (MDL) messages on the PA-MC-2T3+.

Note MDL messages are only supported when the T3 framing is set for C-bit.

•transmit path—Enables transmission of the MDL path message

•transmit idle-signal—Enables transmission of the MDL idle-signal message

•eic—Equipment identification code (up to 10 characters)

•lic—Location identification code (up to 11 characters)

•fic—Frame identification code (up to 10 characters)

•unit—Unit identification code (up to 6 characters)

•pfi—Facility identification code to send in the MDL path message (up to 38 characters)

•port—Equipment port, which initiates the idle signal, to send in the MDL idle signal message (up to 38 characters)

•generator—Generator number to send in the MDL test signal message (up to 38 characters)

Use the no form of this command to remove MDL messages. The default is that no MDL message is configured.

Configuring the Serial Interface

 
Command
Purpose

Step 1 

Cisco 7200 series routers:

Router# configuration terminal 

Router(config)# controller T3 chassis-slot/T3-port

or

Cisco 7500 series routers:

Router# configuration terminal

Router(config)# interface serial interface-processor-slot/port-adapter-slot/T3-port


Enables interface configuration mode and selects a serial interface to configure.

Step 2 

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

Specifies the T3 framing on the serial interface.

•c-bit—C-bit parity DS3 framing

•m13—M13 Multiplex DS3 framing

The default is C-bit framing.

Step 3 

Router(config-if)# cablelength feet

Specifies the cable length.

•feet—A numeral from 0 to 450

Step 4 

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

Sets the clock source for the selected T3 interface.

•line—Selects a network clock source

•internal—Selects an internal clock source

Step 5 

Router(config-if)# dsu mode [ 0 | 1 |2 | 3 | 4 ]

Configures the PA-MC-2T3+ to emulate a proprietary DSU subrate scheme.

•0—Digital Link or Cisco—300-44210 Kbps

•1—ADC Kentrox T3/E3 IDSU—1500-35000, 44210 Kbps

•2—Larscom Access T45—3100-44210 Kbps

•3—Adtran T3SU 300—75-44210 Kbps

•4—Verilink HDM 2182—1500-44210 Kbps

Default is 0.

Step 6 

Router(config-if)# dsu bandwidth bandwidth

Configures the bandwidth for an unchannelized subrate T3 interface.

•bandwidth—A Numeric value between 1 and 44210

The default bandwidth is 44210.

Verifying the Configuration

After configuring a new T3 controller, you can verify the configuration by using show commands. To display the status of any a new T3 controller or newly configured interface, complete any of the following tasks in EXEC mode:

Step 1 Display the status of the T3 controller on a Cisco 7200 series router using the show controllers t3 port-adapter/t3-port [brief | tabular] command.

or

Display the status of the T3 controller on a Cisco 7500 series router using the show controllers t3 slot/port-adapter/t3-port [brief | tabular] command: 

Router# show controllers t3 0/1/0 brief

T3 0/1/0 is up.  Hardware is 2CT3+ single wide port adapter

  CT3 H/W Version: 0.1.1, CT3 ROM Version: 0.95, CT3 F/W Version: 2.4.0

  FREEDM version: 1, reset 0

  Applique type is Subrate T3

  No alarms detected.

  MDL transmission is disabled

  FEAC code received: No code is being received

  Framing is C-BIT Parity, Line Code is B3ZS, Clock Source is Line

  Rx throttle total 0, equipment customer loopback

Router# show controllers t3 0/1/0 tabular

T3 0/1/0 is up.  Hardware is 2CT3+ single wide port adapter

  CT3 H/W Version: 0.1.1, CT3 ROM Version: 0.95, CT3 F/W Version: 2.4.0

  FREEDM version: 1, reset 0

  Applique type is Subrate T3

  No alarms detected.

  MDL transmission is disabled

  FEAC code received: No code is being received

  Framing is C-BIT Parity, Line Code is B3ZS, Clock Source is Line

  Rx throttle total 0, equipment customer loopback

  INTERVAL      LCV   PCV   CCV   PES  PSES  SEFS   UAS   LES   CES  CSES

  06:17-06:24     0     0     0     0     0     1     0     0     0     0

  06:02-06:17     4     2     1     1     0     0     1     0     0     0

  05:47-06:02     0     0     0     0     0     0     0     0     0     0

  05:32-05:47     0     0     0     0     0     0     0     0     0     0

  05:17-05:32     0     0     0     0     0     0     0     0     0     0

  05:02-05:17     0     0     0     0     0     0     0     0     0     0

  04:47-05:02     0     0     0     0     0     0     0     0     0     0

  04:32-04:47     0     0     0     0     0     0     0     0     0     0

  04:17-04:32     0     0     0     0     0     0     0     0     0     0

  04:02-04:17     0     0     0     0     0     0     0     0     0     0

  03:47-04:02     0     0     0     0     0     0     0     0     0     0

  03:32-03:47     0     0     0     0     0     0     0     0     0     0

  03:17-03:32     0     0     0     0     0     0     0     0     0     0

[additional command output omitted]


 

Use the show interfaces serial port-adapter/t3-port command to display statistics about the serial interface for a specific T3 line on a Cisco 7200 series router: 

Router# show interfaces serial 5/0

Serial5/0 is up, line protocol is down 

  Hardware is PA-MC-2T3+

  MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, 

     reliability 128/255, txload 1/255, rxload 1/255

  Encapsulation HDLC, crc 16, loopback not set

  Keepalive set (10 sec)

  Last input never, output never, output hang never

  Last clearing of "show interface" counters never

  Queueing strategy: fifo

  Output queue 0/40, 0 drops; input queue 0/75, 0 drops

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     0 packets input, 0 bytes, 0 no buffer

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

              0 parity

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

     5823 packets output, 140669 bytes, 0 underruns

     0 output errors, 0 applique, 0 interface resets

     0 output buffer failures, 0 output buffers swapped out

     1 carrier transitions

 DSU mode 0, bandwidth 44210, scramble 0


or

Display statistics about the serial interface for a specific T3 line on a Cisco 7500 series router using the show interfaces serial slot/port-adapter/t3-port command: 

Router# show interfaces serial 1/0/0

Serial1/0/0 is up, line protocol is up 

  Hardware is cyBus 2CT3+ Serial

  MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, 

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation HDLC, crc 16, loopback not set

  Keepalive set (10 sec)

  Last input 00:00:09, output 00:00:07, output hang never

  Last clearing of "show interface" counters never

  Queueing strategy: fifo

  Output queue 0/40, 4 drops; input queue 0/75, 0 drops

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     4 packets input, 402 bytes, 0 no buffer

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

              0 parity

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 1 abort

     5 packets output, 1008 bytes, 0 underruns

     0 output errors, 0 applique, 1 interface resets

     0 output buffer failures, 0 output buffers swapped out

     0 carrier transitions

 DSU mode 0, bandwidth 44210, scramble 0

Troubleshooting Tips

Set loopbacks to troubleshoot the PA-MC-2T3+.

Setting Loopbacks

You can configure the T3 controller for loopback modes using the serial interface loopback command. The default is no loopback. The three main loopback modes are: local, network, and remote. The T3 local loopback simultaneously loops the T3 port toward the router and loops the T3 link back toward the network.

The T3 network loopback loops the T3 line or payload back toward the network. A T3 remote loopback loops the T3 line at the remote end. Use T3 loopbacks to diagnose problems with cables between the port adapter and the central switching office at the T3 line level. You can also use the loopback modes with bit error rate (BER) tests.

To set a loopback on the T3 controller or T3 lines, perform the following optional tasks beginning in global configuration mode:

 
Command
Task

Step 1  

Router(config)# interface serial 
slot/port-adapter/port

(Cisco 7500 series and Cisco 7000 series routers with RSP) 

Router(config)# interface serial slot/port

(Cisco 7200 series)

Select the T3 serial interface and enter interface configuration mode.

Step 2 

Router(config-controller)# loopback {local | network | remote}

Set a loopback on the T3 controller.

Monitoring and Maintaining the PA-MC-2T3+

Command
Purpose

Cisco 7200 series routers: 

Router# show controllers T3 slot/t3-port

Cisco 7500 series routers:

Router# show controllers T3 slot/port-adapter/t3-port


Displays the configuration, including the results of BER tests, for a specified T3 controller.

Cisco 7200 series routers:

Router# show interface serial slot/t3-port

Cisco 7500 series routers:

Router# show interface serial slot/port-adapter/t3-port

Displays the interface configuration of a specified serial interface.


Configuration Examples

This section provides the following configuration examples:

•Configuring a T3 Controller Example

•Configuring a Full-Rate T3 Interface Example

•Configuring a Subrate T3 Interface Example

Configuring a T3 Controller Example

The following example configures the T3 controller of a PA-MC-2T3+ in slot 1 of a Cisco 7200 series router: 

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)# controller T3 1/0

Router(config-controller)# no channelized

Router(config-controller)# exit

Router(config)# interface serial 1/0/0

Router(config-if)# framing c-bit

Router(config-if)# cablelength 40

Router(config-if)# clock source line

Router(config-if)# mdl transmit path


The following example configures the T3 controller of a PA-MC-2T3+ on a VIP2 or VIP4 in 
interface processor slot 1 on a Cisco 7500 series router:


Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)# controller T3 1/0/0

Router(config-controller)# no channelized

 
Change to subrate mode will cause cbus complex reset. Proceed? [yes/no]:Y

Router(config-controller)# exit

Router(config)# interface serial 1/0/0

Router(config-if)# framing c-bit

Router(config-if)# cablelength 40

Router(config-if)# clock source line

Router(config-if)# mdl transmit path

Configuring a Full-Rate T3 Interface Example

The following example configures a full-rate T3 interface on a Cisco 7500 series router by using the no channelized command: 

Router(config)# controller t3 2/0/0

Router(config-controller)# no channelized

Change to subrate mode will cause cbus complex reset. Proceed? [yes/no]: Y

Router(config-controller)# exit

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

Router(config-if)# encapsulation ppp

Router(config-if)# ip address 10.10.10.10 255.255.255.255

Router(config-if)# no shutdown

Configuring a Subrate T3 Interface Example

In order to configure a subrate T3 interface, you must first configure the interface as a full-rate T3 using the no channelized configuration controller command. After the full-rate T3 interface is configured, use the dsu bandwidth command to create a subrate T3 interface.The following example configures a subrate T3 interface on a Cisco 7200 series router: 

Router(config)# controller t3 2/0

Router(config-controller# no channelized

Router(config-controller)# exit

Router(config)# interface serial 2/0

Router(config-if)# dsu bandwidth 16000

Router(config-if)# encapsulation frame-relay

Router(config-if)# ip address 10.10.10.10 255.255.255.255

Router(config-if)# no shutdown

Command Reference

The following command is pertinent to this feature. To see the command pages for this command and other commands used with this feature, go to the Cisco IOS Master Commands List, Release 12.4, at http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124mindx/124index.htm.

•no channelized

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