Interface and Hardware Component Configuration Guide, Cisco IOS Release 15M&T
Lossless Compression R1 ATM Cell Switching and External BITS Clocking Source
Downloads: This chapterpdf (PDF - 1.41MB) The complete bookPDF (PDF - 5.86MB) | The complete bookePub (ePub - 1.28MB) | Feedback

Lossless Compression R1 ATM Cell Switching and External BITS Clocking Source

Contents

Lossless Compression R1 ATM Cell Switching and External BITS Clocking Source

The Lossless Compression R1, ATM Cell Switching, and External BITS Clocking Source features introduce a new compression technique in DSP firmware and add enhancements to Cisco IOS that include cell switching on ATM segmentation and reassembly (SAR), and the use of an external BITS clocking source. These features enable Cisco multiservice routers to be used to transparently groom and compress traffic in a wireless service provider network and enable a service provider to optimize the bandwidth used to backhaul the traffic from a cell site to the mobile central office for more efficient use of existing T1 and E1 lines.

Feature Specifications for Cisco Lossless Compression R1, ATM Cell Switching, and External BITS Clocking Source

Feature History

Release

Modification

12.3(4)XD

These features were introduced.

12.3(7)T

These features were integrated into Cisco IOS Release 12.3(7)T.

Supported Platforms

Cisco 3660, Cisco 3745

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Prerequisites for Cisco Lossless Compression R1 ATM Cell Switching and External BITS Clocking Source

The Lossless Compression R1, ATM Cell Switching, and External BITS Clocking Source features require a Cisco 3660 or Cisco 3745 with the following components installed:

Table 1 Supported Network Modules

Feature

Cisco 3660

Cisco 3745

Lossless compression R1

NM-HDV

NM-HDV

ATM cell switching

AIM-ATM or AIM-ATM-VOICE-30

NM-x FE2W with VWIC-x MFT-T1/E1

AIM-ATM or AIM-ATM-VOICE-30

NM-x FE2W with VWIC-x MFT-T1/E1

VWIC-x MFT-T1/E1 (on-board WIC slot)

BITS clocking

NM-HDV

NM-x FE2W with VWIC-x MFT-T1/E1

NM-HDV

NM-x FE2W with VWIC-x MFT-T1/E1

VWIC-x MFT-T1/E1 (on-board WIC slot)

Restrictions for Cisco Lossless Compression R1 ATM Cell Switching and External BITS Clocking Source

  • Operations, administration, and maintenance (OAM) cell insertion is not supported on cell-switched PVCs.

  • AIM-ATM and AIM-ATM-VOICE-30 modules support a maximum of four T1/E1s. This can consist of two incoming and two outgoing, or three incoming and one outgoing T1/E1s. An IMA group cannot be split between multiple AIMs.

  • Certain combinations of AIM modules can become inoperable when installed in a Cisco 3745. This problem only affects Cisco 3745 routers manufactured before June 11, 2003. See the following field notice for detailed information about this problem:

http://www-tac.cisco.com/Support_Library/field_alerts/fn25194.html

  • Voice activity detection (VAD) and echo cancellation are disabled when lossless compression is enabled.

  • Lossless compression R1 is supported for VoATM calls with AAL2 and subcell multiplexing. VoIP calls are not supported at this time.

  • ATM cell switching is limited to a maximum of 25 connections per AIM-ATM.

  • Do not configure more than 29 LLCC channels per NM-HDV module. Configuring more than 29 LLCC channels can cause unreliable operation.

  • J1 controller is not supported.

  • Traffic policing is not supported.

  • For Cisco 3660 routers with two NM-HDV modules installed, do not install the modules in the following slot combinations:
    • Slot 1 and Slot 3
    • Slot 2 and Slot 4
    • Slot 5 and Slot 6

Using these slot combinations can result in packet loss.

Information About Lossless Compression R1 ATM Cell Switching and External BITS Clocking Source

The Lossless Compression R1, ATM Cell Switching, and External BITS Clocking Source features work together to groom and compress T1 and E1 traffic between cell sites and a mobile central office. These features require a Cisco 3660 or Cisco 3745 router to be installed at the base transceiver station (BTS). This cell site router performs ATM switching and compression of cell site traffic for transport to the base station controller (BSC). A Cisco MGX 8850 with AUSM and VISM-PR terminates the T1/E1 lines that carry lossless compression codec (LLCC) traffic, converting the traffic back to PCM before passing it to the BSC. The figure below shows a sample topology that makes use of the Lossless Compression R1, ATM Cell Switching, and External BITS Clocking Source features.

Figure 1. Lossless Compression R1, ATM Cell Switching, and External BITS Clocking Source Features

Lossless Compression Codec on NM-HDV

The Lossless Compression R1 feature introduces a new compression technique in DSP firmware and the VISM card-- the lossless compression codec (LLCC). LLCC operates in a similar fashion to the existing clear channel codec: the decoded 64kbps PCM stream is a bit-exact replica of the PCM stream provided on the TDM side of the encoding DSP. However, rather than simply packetizing the PCM stream, the LLCC encoder applies a lossless data compression scheme. This results in a net reduction in the data transmission rate, yielding a reduction in the packet transmission rate.

ATM Cell Switching on AIM-ATM and AIM-ATM-VOICE-30

The Cisco ATM Cell Switching feature enables the router to perform cell switching between two ATM connections on AIM-ATM and AIM-ATM-VOICE-30 cards, giving the router the ability to receive ATM traffic from the BTS and backhaul it to the mobile central office.

BITS Clocking on the Cisco 3660 and Cisco 3745

BITS (Building Integrated Timing Supply) network clocking enables a Cisco 3660 or Cisco 3745 router to derive network timing from the central office. BITS must be configured on the cell site router to support this feature.

How to Configure Lossless Compression R1 ATM Cell Switching and External BITS Clocking Source

The procedures for configuring the Lossless Compression R1, ATM Cell Switching, and External BITS Clocking Source features require the following tasks:

The instructions that follow refer to the sample configuration shown in the figure below. With this configuration, the cell site router supports three E1 connections to the BTS. Compressed cellular traffic is transported to the BSC (by way of the Cisco MGX 8850) over the E1 1/0 and E1 1/1 interfaces. Additionally, BITS clocking is derived from E1 1/1.

Figure 2. Sample Configuration

Configuring the Cell Site Router for BITS Clocking

BITS clocking enables the router at a cell site to derive timing from the mobile central office. BITS clocking ensures that data flows to a single network clock source, preventing mismatches and data slips in traffic between the BTS and the BSC. The procedure that follows configures the AIM to receive BITS clocking from E1 1/1 controller.

Summary Steps

  1. enable

  2. configure terminal

  3. network-clock-participate slot number

  4. network-clock-select priority slot number

  5. controller e1 slot/port

  6. clock source {line [primary | bits] | internal}

Detailed Steps

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    network-clock-participate slot number

    4.    network-clock-select priority slot number

    5.    controller t1 | e1 slot/port

    6.    clock source { line [primary | bits] | internal}


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Router> enable
     

    Enables privileged EXEC mode. Enter your password when prompted.

     
    Step 2 configure terminal


    Example:
    Router# configure terminal
     

    Enters global configuration mode.

     
    Step 3 network-clock-participate slot number


    Example:
    Router(config)# network-clock-participate slot 1
     

    Allows the network module in the specified slot to use the network clock for its timing.

     
    Step 4 network-clock-select priority slot number


    Example:
    Router(config)# network-clock-select 1 E1 1/1
     

    Specifies a port to be used as a timing source for the network clock, and the priority level for the use of that port. The source that is given the highest priority is used first; if it becomes unavailable, the source with the second-highest priority is used, and so forth.

     
    Step 5 controller t1 | e1 slot/port


    Example:
    Router(config)# controller e1 1/1
     

    Enters controller configuration mode for the selected T1 or E1.

     
    Step 6 clock source { line [primary | bits] | internal}


    Example:
    Router(config-controller)# clock source line bits
     

    Specifies that the clock is generated from the T1 or E1 BITS source.

     

    Configuring ATM Cell Switching

    The procedure that follows configures the cell site router to switch ATM traffic with the Cisco MGX 8850 at the BSC. This procedure configures ATM switching between E1 3/0 and E1 1/0, using the AIM installed in Slot 1.

    Summary Steps

    1. enable

    2. configure terminal

    3. network-clock-participate slot number

    4. network-clock-participate slot number

    5. network-clock-participate aim number

    6. controller t1 | e1 slot /port

    7. mode atm aim aim-slot

    8. controller t1 | e1 slot/port

    9. mode atm aim aim-slot

    10. interface atm interface-number /subinterface-number

    11. pvc vpi /vci l2transport

    12. interface atm interface-number /subinterface-number

    13. pvc vpi /vci l2transport

    14. connect id atm slot /port-1 atm slot/port-2

    Detailed Steps

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    network-clock-participate slot number

      4.    network-clock-participate slot number

      5.    network-clock-participate aim number

      6.    controller t1 | e1 slot/port

      7.    mode atm aim aim-slot:

      8.    controller t1 | e1 slot/port

      9.    mode atm aim aim-slot

      10.    interface atm interface-number /subinterface-number

      11.    pvc vpi /vci l2transport

      12.    interface atm interface-number /subinterface-number

      13.    pvc vpi /vci l2transport

      14.    connect id atm slot /port-1 atm slot/port-2


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example:
      Router> enable
       

      Enables privileged EXEC mode. Enter your password when prompted.

       
      Step 2 configure terminal


      Example:
      Router# configure terminal
       

      Enters global configuration mode.

       
      Step 3 network-clock-participate slot number


      Example:
      Router(config)# network-clock-participate slot 1
       

      Enables the network module in the specified slot to use the network clock for its timing.

       
      Step 4 network-clock-participate slot number


      Example:
      Router(config)# network-clock-participate slot 3
       

      Enables the network module in the specified slot to use the network clock for its timing.

       
      Step 5 network-clock-participate aim number


      Example:
      Router(config)# network-clock-participate aim 0
       

      Specifies that the AIM in Slot 0 will derive clocking from the network source.

       
      Step 6 controller t1 | e1 slot/port


      Example:
      Router(config)# controller e1 1/0
       

      Enters controller configuration mode for the selected T1 or E1.

       
      Step 7 mode atm aim aim-slot:


      Example:
      Router(config-controller)# mode atm aim 0
       

      Sets the mode of the T1 or E1 controller in AIM Slot 0.

       
      Step 8 controller t1 | e1 slot/port


      Example:
      Router(config)# controller e1 3/0
       

      Enters controller configuration mode for the selected T1 or E1.

       
      Step 9 mode atm aim aim-slot


      Example:
      Router(config-controller)# mode atm aim 0
       

      Sets the mode of the T1 or E1 controller in AIM Slot 0.

       
      Step 10 interface atm interface-number /subinterface-number


      Example:
      Router(config) # interface atm 1/0
       

      Enters configuration mode for the selected ATM interface.

       
      Step 11 pvc vpi /vci l2transport


      Example:
      Router(config-if)# pvc 10/110 l2transport 
       

      Creates a PVC for the virtual path identifier (VPI) and virtual channel identifier (VCI) and specifies that the PVC is switched, not terminated.

       
      Step 12 interface atm interface-number /subinterface-number


      Example:
      Router (config) # interface atm 3/0
       

      Enters configuration mode for the selected ATM interface.

       
      Step 13 pvc vpi /vci l2transport


      Example:
      Router(config-if)# pvc 30/130 l2transport 
       

      Creates a PVC for the VPI and VCI and specifies that the PVC is switched.

       
      Step 14 connect id atm slot /port-1 atm slot/port-2


      Example:
      
      
              


      Example:
      Router(config)# connect Switched-Conn atm 1/0 10/110 atm 3/0 30/130
       

      Defines connections between T1 or E1 controller ports and the ATM interface.

       

      Configuring the Lossless Compression Codec

      The procedure that follows configures an LLCC voice channel on E1 4/0 and sends it over the ATM network using E1 1/0 and the AIM installed in Slot 1.

      Summary Steps

      1. enable

      2. configure terminal

      3. network-clock-participate slot number

      4. network-clock-participate slot number

      5. network-clock-participate aim number

      6. voice service {pots | voatm | vofr | voip}

      7. session protocol aal2

      8. subcell-mux

      9. codec aal2-profile custom profile-number codec

      10. controller t1 | e1 slot/port

      11. mode atm aim aim-slot

      12. controller t1 | e1 slot/port

      13. ds0-group ds0-group-number timeslots timeslot-list type signaling method

      14. interface atm interface-number /subinterface-number

      15. pvc vpi /vci

      16. vbr-rt peak-rate average-rate burst

      17. encapsulation aal2

      18. dial-peer voice tag voatm

      19. destination-pattern string

      20. session protocol aal2-trunk

      21. session target interface pvc vpi/vci

      22. signal-type cas | cept | ext-signal | transparent

      23. codec aal2-profile custom profile-number codec

      24. voice-port {slot-number/subunit-number/port | slot/port:ds0-group-no}

      25. playout-delay {fax | maximum | nominal} milliseconds

      26. connection {plar | tie-line | plar-opx} digits |{trunk digits [answer-mode]}

      Detailed Steps

      SUMMARY STEPS

        1.    enable

        2.    configure terminal

        3.    network-clock-participate slot number

        4.    network-clock-participate slot number

        5.    network-clock-participate aim number

        6.    voice service {pots | voatm | vofr | voip}

        7.    session protocol aal2

        8.    subcell-mux

        9.    codec aal2-profile custom profile-number codec

        10.    controller t1 | e1 slot/port

        11.    mode atm aim aim-slot

        12.    controller t1 | e1 slot/port

        13.    ds0-group ds0-group-number timeslots timeslot-list type signaling method

        14.    interface atm interface-number /subinterface-number

        15.    pvc vpi /vci

        16.    vbr-rt peak-rate average-rate burst

        17.    encapsulation aal2

        18.    dial-peer voice tag voatm

        19.    destination-pattern string

        20.    session protocol aal2-trunk

        21.    session target interface pvc vpi/vci

        22.    signal-type cas | cept | ext-signal | transparent

        23.    codec aal2-profile custom profile-number codec

        24.    voice-port {slot-number/subunit-number/port | slot/port:ds0-group-no}

        25.    playout-delay {fax | maximum | nominal} milliseconds

        26.    connection {plar | tie-line | plar-opx} digits | {trunk digits [answer-mode]}


      DETAILED STEPS
         Command or ActionPurpose
        Step 1 enable


        Example:
        Router> enable
         

        Enables privileged EXEC mode. Enter your password when prompted.

         
        Step 2 configure terminal


        Example:
        Router# configure terminal
         

        Enters global configuration mode.

         
        Step 3 network-clock-participate slot number


        Example:
        Router(config)# network-clock-participate slot 1
         

        Enables the network module in the specified slot to use the network clock for its timing.

         
        Step 4 network-clock-participate slot number


        Example:
        Router(config)# network-clock-participate slot 4
         

        Enables the network module in the specified slot to use the network clock for its timing.

         
        Step 5 network-clock-participate aim number


        Example:
        Router(config)# network-clock-participate aim 0
         

        Specifies that the AIM in Slot 0 will derive clocking from the network source.

         
        Step 6 voice service {pots | voatm | vofr | voip}


        Example:
        Router(config)# voice service voatm
         

        Enters voice service configuration mode and specifies VoATM as the encapsulation type.

         
        Step 7 session protocol aal2


        Example:
        Router(config-voi-serv)# session protocol aal2
         

        Enters voice-service-session configuration mode and specifies ATM adaptation layer 2 (AAL2) trunking.

         
        Step 8 subcell-mux


        Example:
        Router(conf-voi-serv-sess)# subcell-mux
         

        Enables AAL2 common part sublayer (CPS) subcell multiplexing.

         
        Step 9 codec aal2-profile custom profile-number codec


        Example:
        Router# codec aal2-profile custom 51 0 0 llcc 40 0 15
         

        Sets the codec profile for the DSP on a per-call basis and specifies the lossless compression codec.

         
        Step 10 controller t1 | e1 slot/port


        Example:
        Router(config)# controller e1 1/0
         

        Enters controller configuration mode for the selected T1 or E1.

         
        Step 11 mode atm aim aim-slot


        Example:
        Router(config-controller)# mode atm aim 0
         

        Sets the mode of the T1 or E1 controller in AIM Slot 0.

         
        Step 12 controller t1 | e1 slot/port


        Example:
        Router(config)# controller e1 4/0
         

        Enters controller configuration mode for the selected T1 or E1.

         
        Step 13 ds0-group ds0-group-number timeslots timeslot-list type signaling method


        Example:
        Router(config-controller)# ds0-group 0 timeslots 1 type ext-sig
         

        Specifies the DS0 time slots that make up a logical voice port on a T1 or E1 controller and specifies the signaling type used by the router.

         
        Step 14 interface atm interface-number /subinterface-number


        Example:
        Router(config) # interface atm 1/0
         

        Enters configuration mode for the selected ATM interface.

         
        Step 15 pvc vpi /vci


        Example:
        Router(config-if-atm)# pvc 10/110
         

        Enters configuration mode for the selected PVC.

         
        Step 16 vbr-rt peak-rate average-rate burst


        Example:
        Router(config-if-atm-pvc)# vbr-rt 1920 1920 255 
         

        Configures real-time variable bit rate (VBR) for VoATM voice connections.

         
        Step 17 encapsulation aal2


        Example:
        Router(config-if-atm-pvc)# encapsulation aal2
         

        Configures the encapsulation type for the ATM virtual circuit.

         
        Step 18 dial-peer voice tag voatm


        Example:
        Router(config)# dial-peer voice 1001 voatm
         

        Defines a dial-peer and specifies the method of voice encapsulation as VoATM.

         
        Step 19 destination-pattern string


        Example:
        Router(config-dial-peer)# destination-pattern 1001
         

        Specifies the prefix to be used by the dial peer.

         
        Step 20 session protocol aal2-trunk


        Example:
        Router(config-dial-peer)# session protocol aal2-trunk
         

        Specifies the dial peer uses AAL2 nonswitched trunk session protocol.

         
        Step 21 session target interface pvc vpi/vci


        Example:
        Router(config-dial-peer)# session target atm 1/0 pvc 10/100 9
         

        Specifies the network-specific address for the VoATM dial peer.

         
        Step 22 signal-type cas | cept | ext-signal | transparent


        Example:
        Router(config-dial-peer)# signal-type ext-signal
         

        Specifies that external signaling is used when connecting to the dial peer. The DSP does not generate any signaling frames.

         
        Step 23 codec aal2-profile custom profile-number codec


        Example:
        Router(config-dial-peer)# codec aal2-profile custom 51 llcc
         

        Sets the codec profile for the DSP on a per-call basis and specifies the lossless compression codec.

         
        Step 24 voice-port {slot-number/subunit-number/port | slot/port:ds0-group-no}


        Example:
        Router(config)# voice-port 2/0:0
         

        Enters voice-port configuration mode.

         
        Step 25 playout-delay {fax | maximum | nominal} milliseconds


        Example:
        Router(config-voice-port)# playout-delay nominal 25
         

        Tunes the playout buffer to accommodate packet jitter caused by switches in the WAN. The nominal keyword specifies the initial (and minimum allowed) delay time that the DSP inserts before playing out voice packets, in milliseconds.

         
        Step 26 connection {plar | tie-line | plar-opx} digits | {trunk digits [answer-mode]}


        Example:
        Router(config-voice-port)# connection trunk 1001 
         

        Associates this voice-port to destination-pattern 1001.

         
        What to Do Next


        Note


        To ensure that the voice-port configuration takes affect, issue the shutdown command, followed by no shutdown to enable it again.


        Disabling Connection Admission Control

        Connection admission control (CAC) is a set of actions taken by each ATM switch during connection setup to determine whether the requested QoS will violate the QoS guarantees for established connections. CAC reserves bandwidth for voice calls, however, the bandwidth required when LLCC is used is dynamic and usually less than what is generally reserved by CAC. Disabling CAC may help in better utilization of bandwidth when LLCC is used. The procedure that follows disables CAC.

        Summary Steps

        1. enable

        2. configure terminal

        3. interface atm interface-number/subinterface-number

        4. pvc vpi/vci

        5. cac_off

        Detailed Steps

        SUMMARY STEPS

          1.    enable

          2.    configure terminal

          3.    interface atm interface-number /subinterface-number

          4.    pvc vpi /vci

          5.    cac_off


        DETAILED STEPS
           Command or ActionPurpose
          Step 1 enable


          Example:
          Router> enable
           

          Enables privileged EXEC mode. Enter your password when prompted.

           
          Step 2 configure terminal


          Example:
          Router# configure terminal
           

          Enters global configuration mode.

           
          Step 3 interface atm interface-number /subinterface-number


          Example:
          Router(config) # interface atm 1/0
           

          Enters configuration mode for the selected ATM interface.

           
          Step 4 pvc vpi /vci


          Example:
          Router(config-if-atm)# pvc 10/110
           

          Enters configuration mode for the selected PVC.

           
          Step 5 cac_off


          Example:
          Router# (config-if-atm-vc)# cac_off 
           

          Disables call admission control.

           

          Verifying Lossless Compression R1 ATM Cell Switching and External BITS Clocking Source Configuration

          This section provides a set of show commands you can use to verify the configuration of the Lossless Compression R1, ATM Cell Switching, and External BITS Clocking Source features. It includes the following commands:

          show connection all

          The following example shows output from the show connection allcommand. In this example, Switched-Conn is a cell-switched connection established between PVC 10/110 and PVC 30/130, which are configured under ATM1/0 and ATM3/0 respectively.

          Router# show connection all
          ID    Name             Segment 1             Segment 2           State
          ========================================================================
          3     V-100-700        E1 1/0(VOICE) 00      DSP 07/00/00        UP
          4     V-120-700        E1 1/2(VOICE) 00      DSP 07/00/00        UP
          5     Switched-Conn    ATM1/0 10/110         ATM3/0 30/130       UP
          

          The show connection all command displays the state of Switched-Conn. If it is in the UP state, then it means the ATM cell switching connection is operational.

          show voice dsp

          The following example shows output from the show voice dsp command:

          Router# show voice dsp
          DSP  DSP             DSPWARE CURR  BOOT                         PAK  TX/RX
          TYPE NUM CH CODEC    VERSION STATE STATE   RST AI VOICEPORT TS ABORT PACK COUNT
          ==== === == ======== ======= ===== ======= === == ========= == ===== ==========
          C549 000 04 llcc     4.3.392 busy  idle         0 4/0:0     04     0 1752/1752
          

          The show voice dsp command shows if the LLCC codec has been applied to the voice port. Additionally, the TX/RX COUNT indicates if packet exchange is occurring. If LLCC is operational, then TX/RX COUNT will display similar values.

          show voice call port-id

          The show voice callcommand gives detailed information about the lossless compression codec. The following example shows output from the show voice call command:


          Note


          The show voice call command has a limitation that causes it to display invalid values. To ensure that accurate values are reported, invoke this command twice and look at the second output.


          Router# show voice call 4/0:0
          4/0:0 1
                vtsp level 0 state = S_CONNECTvpm level 1 state = S_TRUNKED
          vpm level 0 state = S_UP
          lossless compression summary:
              average compression ratio since reset       = 50
              current compression ratio                   = 50
              max buffer size (ms)                        = 41
              nominal buffer size (ms)                    = 25
              current buffer size (ms)                    = 26
              total encoder input frame count             = 5534
              total encoder output frame count            = 2767
              encoded tx front-end compressed frame count = 2767
              encoded tx back-end compressed frame count  = 0
              encoded tx frame count (no compression)     = 0
              underflow error count                       = 0
              overflow error count                        = 0
              decode error count                          = 0
              tx signalling frame count                   = 11
              rx signalling frame count                   = 10
              rx bad checksum frame count                 = 0
              rx good checksum frame count                = 2777

          show voice trunk supervisory summary

          The following example shows output from the show voice trunk supervisory summary command:

          Router# show voice trunk supervisory summary
          SLOW SCAN
          4/0:0(1) : state : TRUNK_SC_CCS_CONNECT, master

          show interfaces

          The following example shows output from the show interfaces command:

          Router# show interfaces atm1/0
          ATM1/0 is up, line protocol is up 
            Hardware is ATM AIM E1
            MTU 4470 bytes, sub MTU 4470, BW 1920 Kbit, DLY 20000 usec, 
               reliability 0/255, txload 1/255, rxload 1/255
            Encapsulation ATM, loopback not set
            Encapsulation(s): AAL5 
            255 maximum active VCs, 256 VCs per VP, 0 current VCCs
            VC Auto Creation Disabled.
            VC idle disconnect time: 300 seconds
            Last input never, output never, 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: Per VC Queueing
            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 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, 1 interface resets
               0 output buffer failures, 0 output buffers swapped out

          Additional References

          Related Documents

          Related Topic

          Document Title

          Configuring voice features

          Cisco IOS Voice Configuration Library

          Configuring ATM advanced integration modules

          AIM-ATM and AIM-ATM-VOICE-30 on the Cisco 2600 Series, Cisco 3660, and Cisco 3700 Series

          Configuring high-density voice network modules

          Digital E1 Packet Voice Trunk Network Module Interfaces

          Standards

          Standards1

          Title

          No new standards are supported by this feature.

          1 Not all supported standards are listed.

          MIBs

          MIBs

          MIBs Link

          • No new MIBs are supported by this feature.

          • CISCO-VOICE-COMMON-DIAL-CONTROL-MIBwas modified.

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

          http:/​/​www.cisco.com/​go/​mibs

          RFCs

          RFCs2

          Title

          No new RFCs are supported by this feature.

          2 Not all supported RFCs are listed.

          Technical Assistance

          Description

          Link

          The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

          http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

          Feature Information for Lossless Compression R1 ATM Cell Switching and External BITS Clocking Source

          The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

          Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

          Table 2 Feature Information for Phrase Based on Module Title

          Feature Name

          Releases

          Feature Information

          Lossless Compression R1, ATM Cell Switching, and External BITS Clocking Source

          12.3(4)XD

          These features were introduced.

          Lossless Compression R1, ATM Cell Switching, and External BITS Clocking Source

          12.3(7)T

          These features were integrated into Cisco IOS Release 12.3(7)T.