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Contents

AAL1 CES on AIM-ATM

Last Updated: December 4, 2012

The AAL1 CES on AIM-ATM feature adds circuit emulation service (CES) over ATM AAL1 to Cisco 3660 and Cisco 3745 routers.

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 AAL1 CES on AIM-ATM

The AAL1 CES on AIM-ATM feature requires a Cisco 3660 or Cisco 3745 with an AIM-ATM or AIM-ATM-VOICE-30 installed.

Restrictions for AAL1 CES on AIM-ATM

  • AIM-ATM and AIM-ATM-VOICE-30 network 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.
  • You cannot install two AIM-ATM modules in a cellular site router. If two AIMs are needed, install one AIM-ATM and one AIM-ATM-VOICE-30.
  • This feature supports only synchronous clocking. SRTS and adaptive clocking are not supported.
  • This feature supports only structured CES without CAS.
  • ATM subinterfaces do not support AAL1 CES.

Information About AAL1 CES on AIM-ATM

The AAL1 CES on AIM-ATM feature, along with the ATM Cell Switching and Lossless Compression R1 feature, enables wireless service providers 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.

CES

CES is a technique specified by the ATM Forum for carrying constant bit-rate traffic over an ATM network. CES is a cell-based technology where voice traffic is adapted for an ATM network using AAL1, and the circuit is emulated across an ATM network.

How to Configure AAL1 CES on AIM-ATM

The sample configuration in this section is based on the figure below.

Figure 1AAL1 CES on AIM-ATM Sample Configuration


Configuring AAL1 CES on AIM-ATM

To configure AAL1 CES on AIM-ATM, perform the steps in this section.

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.    tdm-group tdm-group-no timeslots timeslot-list

10.    tdm-group tdm-group-no timeslots timeslot-list

11.    interface atm interface-number /subinterface-number

12.    pvc vpi / vci [ces]

13.    ces-cdv time

14.    exit

15.    pvc vpi / vci ces

16.    ces-cdv time

17.    exit

18.    exit

19.    connect connection-name atm slot/port [name of PVC/SVC | vpi/vci] T1 slot/port TDM-group-number

20.    connect connection-name atm slot/port [name of PVC/SVC | vpi/vci] T1 slot/port TDM-group-number


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 2

 

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 1

 

Sets the mode of the T1 or E1 controller in AIM Slot 1.

 
Step 8
controller t1 | e1 slot / port


Example:

Router(config)# controller e1 2/0

 

Enters controller configuration mode for the selected T1 or E1.

 
Step 9
tdm-group tdm-group-no timeslots timeslot-list


Example:

Router(config-controller)# tdm-group 1 timeslots 1

 

Configure a TDM channel group for the T1 or E1 interface.

tdm-group-no is a value from 0 to 23 for T1 and from 0 to 30 for E1; it identifies the group.

timeslot-list is a single number, numbers separated by commas, or a pair of numbers separated by a hyphen to indicate a range of timeslots. The valid range is from 1 to 24 for T1. For E1, the range is from 1 to 31.

 
Step 10
tdm-group tdm-group-no timeslots timeslot-list


Example:

Router(config-controller)# tdm-group 2 timeslots 17-31

 

Configure a TDM channel group for the T1 or E1 interface.

 
Step 11
interface atm interface-number /subinterface-number


Example:

Router(config) # interface atm 1/0

 

Enters configuration mode for the selected ATM interface.

 
Step 12
pvc vpi / vci [ces]


Example:

Router(config-if)# pvc 4/44 ces

 

Creates a PVC for the virtual path identifier (VPI) and virtual channel identifier (VCI) and specifies CES encapsulation. Enters interface-ATM-VC configuration mode.

 
Step 13
ces-cdv time


Example:

Router(config-if-ces -vc)# ces-cdv 500

 

Configures the cell delay variation (CDV). The configuration command has the format ces-cdv <time> where the time is the maximum tolerable cell arrival jitter with a range of 1 to 65535 microseconds.

 
Step 14
exit


Example:

Router(config-if-ces-v c)# exit

 

Exits back to interface configuration mode.

 
Step 15
pvc vpi / vci ces


Example:

Router(config-if)# pvc 8/88 ces

 

Creates a second PVC and enters interface-ATM-VC configuration mode.

 
Step 16
ces-cdv time


Example:

Router(config-if-ces -vc)# ces-cdv 1000

 

Configures the CDV for 1000 microseconds.

 
Step 17
exit


Example:

Router(config-if-ces -vc)# exit

 

Exits back to interface configuration mode.

 
Step 18
exit


Example:

Router(config-i f)# exit

 

Exits back to configuration mode.

 
Step 19
connect connection-name atm slot/port [name of PVC/SVC | vpi/vci] T1 slot/port TDM-group-number


Example:

Router(config)# connect alpha ATM 1/0 4/44 E1 2/0 1

 

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

 
Step 20
connect connection-name atm slot/port [name of PVC/SVC | vpi/vci] T1 slot/port TDM-group-number


Example:

Router(config)# connect alpha ATM 1/0 8/88 E1 2/0 2

 

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

 

Configuring IMA Groups

To configure IMA groups, perform the steps in this section.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    network-clock-participate slot number

4.    network-clock-participate aim number

5.    controller t1 | e1 slot/port

6.    mode atm aim aim-slot

7.    interface atm interface-number /subinterface-number

8.    ima-group group-number

9.    exit

10.    Repeat Step 7 through Step 9 to add ATM 2/3 to IMA group 0.

11.    interface atm slot /imagroup-number

12.    pvc vpi /vci [ces]

13.    partial-fill octet

14.    exit

15.    pvc vpi /vci [ces]

16.    ces-cdv time

17.    exit

18.    exit

19.    connect connection-name atm slot/port [name of PVC/SVC|vpi/vci] E1 slot/port TDM-group-number


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 2

 

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

 
Step 4
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 5
controller t1 | e1 slot/port


Example:

Router(config)# controller e1 1/0

 

Enters controller configuration mode for the selected T1 or E1.

 
Step 6
mode atm aim aim-slot


Example:

Router(config-controller)# mode atm aim 1

 

Sets the mode of the T1 or E1 controller in AIM Slot 1.

 
Step 7
interface atm interface-number /subinterface-number


Example:

Router(config)# interface atm 2/1

 

Enters configuration mode for the selected ATM interface.

 
Step 8
ima-group group-number

Example:

Router(config-if)# ima-group 0

 

Specifies that the link is included in an IMA group. Enter an IMA group number from 0 to 3.

 
Step 9
exit

Example:

Router(config-if)# exit

 

Exits interface configuration mode.

 
Step 10
Repeat Step 7 through Step 9 to add ATM 2/3 to IMA group 0.  

 
Step 11
interface atm slot /imagroup-number


Example:

Router(config)# interface atm 0/ima0

 

Enter interface configuration mode for the IMA group.

 
Step 12
pvc vpi /vci [ces]


Example:

Router(config-if)# pvc 5/55 ces

 

Creates a PVC for the virtual path identifier (VPI) and virtual channel identifier (VCI) and specifies CES encapsulation. Enters interface-ATM-VC configuration mode.

 
Step 13
partial-fill octet


Example:

Router(config-if-ces-vc)# partial-fill 35

 

Configures the number of AAL1 user octets per cell for CES. The range of values is 1-46 for T1 and 20-47 for E1.

Note    Partial fill and CDV cannot be modified under a CES PVC that is part of any connection. Do not establish the connection until after you enter the partial-fill and CDV values.
 
Step 14
exit

Example:

Router(config-if-ces-vc)# exit

 

Exits back to interface configuration mode.

 
Step 15
pvc vpi /vci [ces]


Example:

Router(config-if)# pvc 6/66 ces

 

Creates a PVC for the virtual path identifier (VPI) and virtual channel identifier (VCI) and specifies CES encapsulation. Enters interface-ATM-VC configuration mode.

 
Step 16
ces-cdv time


Example:

Router(config-if-ces-vc)# ces-cdv 1000

 

Configures the CDV for 1000 microseconds.

 
Step 17
exit

Example:

Router(config-if-ces-vc)# exit

 

Exits back to interface configuration mode.

 
Step 18
exit

Example:

Router(config-if)# exit

 

Exits back to configuration mode.

 
Step 19
connect connection-name atm slot/port [name of PVC/SVC|vpi/vci] E1 slot/port TDM-group-number


Example:

Router(config)# connect alpha-IMA atm0/ima0 5/55 E1 2/0 1

 

Establishes the connection between the T1 or E1 controller ports and the IMA group.

 

Configuration Examples for AAL1 CES on AIM-ATM

Configuring AAL1 CES on AIM-ATM Example

The following is a sample configuration for the AAL1 CES on AIM-ATM feature. 

network-clock-participate slot 1 
network-clock-participate slot 2 
network-clock-participate aim 1
controller E1 2/0
 framing NO-CRC4 
 clock source internal
 tdm-group 1 timeslots 1

Note
TDM-group defined for 1 timeslot.
 tdm-group 2 timeslots 17-31

Note
TDM-group defined for 15 timeslots.
interface ATM2/2
 scrambling-payload
 no atm ilmi-keepalive
 pvc 4/44 ces

Note
Default CDV value set to 5 microseconds.
 pvc 8/88 ces
  ces-cdv 1000

Note
Default CDV value set to 1 second.
connect alpha-tim ATM2/2 4/44 E1 2/0 1
connect beta-tim ATM2/2 8/88 E1 2/0 2

Note
CES connections for TDM-AAL1 CES PVCs. 
interface ATM2/1
 ima-group 0
 scrambling-payload
 no atm ilmi-keepalive
 
interface ATM2/3
 ima-group 0
 scrambling-payload
 no atm ilmi-keepalive
 
int atm0/ima0
pvc 5/55 ces

Note
Default CDV value set to 5 microseconds.
 partial-fill 35

Note
Range of partial-fill 1-46 for T1 or 20-47 for E1.
 pvc 6/66 ces
  ces-cdv 1000             
connect alpha-IMA atm0/ima0 5/55 E1 2/0 1

Verifying the AAL1 CES on AIM-ATM Feature Example

The following shows sample output from the show connection all command. This command displays all ATM-TDM connections:

Router# show connection all
ID   Name               Segment 1            Segment 2           State       
========================================================================
.
.
2    V-220-800          E1 2/2(VOICE) 00     DSP 08/00/00        UP          
4    1ds0               ATM2/2 pvc 4/44      E1 2/0 01           UP          
5    V-201-801          E1 2/0(VOICE) 01     DSP 08/00/01        UP          
6    seimens            ATM2/2 pvc 8/88      E1 2/0 02           UP          
.
.

The following example shows sample output from the show connection name command. This command displays segments used, CDV, and partial fill values for CES connections. Default CDV is set for 5 milliseconds. 

Router# show connection name 1ds0
Connection: 4 - 1ds0
 Current State: UP
 Segment 1:  ATM2/2 pvc 4/44
 Segment 2:  E1 2/0 01
  TDM timeslots in use: 1 (1 total)
 Internal Switching Elements: VPD
 CES-CDV: 5000 usec, Partial Fill: 0 bytes

The following example shows sample output from the show atm pvc command. This command displays all PVCs in use. It also displays the Allocated Peak Value for each connection.

Router# show atm pvc
           VCD /                                        Peak  Avg/Min Burst
Interface  Name         VPI   VCI  Type   Encaps   SC   Kbps   Kbps   Cells Sts
2/3        TDM10         15   150  PVC    CES-AAL1 CBR     723               UP
2/3        TDM11         20   200  PVC    CES-AAL1 CBR     795               UP

Note
Only synchronous clocking is supported.

Additional References

The following sections provide references related to the AAL1 CES on AIM-ATM feature.

Related Documents

Related Topic

Document Title

ATM commands

Cisco IOS Asynchronous Transfer Mode Command Reference

Configuring voice features

Cisco IOS Voice Configuration Library, Release 12.4T

Configuring ATM advanced integration modules

"AIM-ATM, AIM-VOICE-30, 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

Standard

Title

None

--

MIBs

MIB

MIBs Link

None

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

RFC

Title

No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.

--

Technical Assistance

Description

Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/techsupport

Feature Information for AAL1 CES on AIM-ATM

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 1Feature Information for AAL1 CES on AIM-ATM

Feature Name

Releases

Feature Information

AAL1 CES on AIM-ATM

12.3(8)T

The AAL1 CES on AIM-ATM feature adds circuit emulation service (CES) over ATM AAL1 to Cisco 3660 and Cisco 3745 routers. CES is a technique specified by the ATM Forum for carrying constant bit-rate traffic over an ATM network. It is a cell-based technology where voice traffic is adapted for an ATM network using AAL1, and the circuit is emulated across an ATM network. This feature, along with the ATM Cell Switching and Lossless Compression R1 feature, enables wireless service providers 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.

In 12.3(8)T, this feature was introduced on the Cisco 3660 and Cisco 3745 routers.

The following commands were introduced or modified: pvc.

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

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