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

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

Finding Feature Information

Contents

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

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

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

Lossless Compression Codec on NM-HDV

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

BITS Clocking on the Cisco 3660 and Cisco 3745

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

Configuring the Cell Site Router for BITS Clocking

Configuring ATM Cell Switching

Configuring the Lossless Compression Codec

Disabling Connection Admission Control

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

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

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


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 feature information and caveats, see 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 for <Phrase Based on Module Title>" section on page 7.

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

Contents

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

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

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

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

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

•Additional References

•Command Reference, page 15

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-xFE2W with VWIC-xMFT-T1/E1

AIM-ATM or AIM-ATM-VOICE-30

NM-xFE2W with VWIC-xMFT-T1/E1

VWIC-xMFT-T1/E1 (on-board WIC slot)

BITS clocking

NM-HDV

NM-xFE2W with VWIC-xMFT-T1/E1

NM-HDV

NM-xFE2W with VWIC-xMFT-T1/E1

VWIC-xMFT-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. Figure 1 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:

•Configuring the Cell Site Router for BITS Clocking

•Configuring ATM Cell Switching

•Configuring the Lossless Compression Codec

•Disabling Connection Admission Control

The instructions that follow refer to the sample configuration shown in Figure 2. 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

 
Command or Action
Purpose

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

 
Command or Action
Purpose

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


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

 
Command or Action
Purpose

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.


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

 
Command or Action
Purpose

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

•show voice dsp

•show voice call port-id

•show voice trunk supervisory summary

•show interfaces

show connection all

The following example shows output from the show connection all command. 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 call command 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

RFCs1
Title

No new RFCs are supported by this feature.

 

1 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

Table 2 lists the release history for this feature.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 2 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.

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.


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