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Table Of Contents
Persistent TDM Switched Circuits
Restrictions for Persistent TDM Switched Circuits
Information About Persistent TDM Switched Circuits
Benefits of Persistent TDM Switched Circuits
How to Configure Persistent TDM Switched Circuits
Configuring Persistent TDM Switched Circuits
Verifying Persistent TDM Switched Circuits Configuration
Configuration Examples for Persistent TDM Switched Circuits
Configuring Persistent TDM Switched Circuits Example
Verifying Persistent TDM Switched Circuits Example
Persistent TDM Switched Circuits
The Persistent Time-Division Multiplexing (TDM) Switched Circuits feature enables the Cisco AS5850 universal gateway to connect one or more DS0s from one or more E1s or T1s to another set of E1s or T1s.
Feature History for Persistent TDM Switched Circuits
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.
Contents
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Restrictions for Persistent TDM Switched Circuits
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Restrictions for Persistent TDM Switched Circuits
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Information About Persistent TDM Switched Circuits
The Persistent TDM Switched Circuits feature enables the Cisco AS5850 to connect one or more DS0s from one or more E1s or T1s to another set of E1s or T1s. Using the existing tdm-group command and the connect command, this feature is configured in the same way SS7-links are configured on the Cisco AS5850: the tdm-group command is used to define the timeslots within a trunk that will be hairpinned, and the connect command is then used to connect two TDM groups together. When defining the timeslots that will be hairpinned, any set of timeslots may be selected, and it is possible to have multiple TDM groups defined for a controller. Moreover, any type of data can be carried on persistent TDM switched circuits; it is passed transparently through the system without any type of processing. For more information on configuring SS7-links or to see how this feature can be used to configure SS7 F-links, refer to "Chapter 5: Provisioning" in the Cisco AS5850 Universal Gateway Operations, Administration, Maintenance, and Provisioning Guide.
Benefits of Persistent TDM Switched Circuits
Benefits of the Persistent TDM Switched Circuits feature include:
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How to Configure Persistent TDM Switched Circuits
See the following sections for configuration tasks for this feature. Each task in the list is identified as either optional or required:
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Configuring Persistent TDM Switched Circuits
To configure the Persistent TDM Switched Circuits feature, perform the following steps:
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DETAILED STEPS
Verifying Persistent TDM Switched Circuits Configuration
To verify Persistent TDM Switched Circuits configuration and the connections on the gateway, use the show connection all command or the show tdm connections command.
Router# show connection allID Name Segment 1 Segment 2 State======================================================================1 tdm1 T1 13/6 00 T1 12/0:2 00 UP2 tdm2 T1 13/5 00 T1 8/0:2 00 UPRouter# show tdm connectionsConn Type -----First FB------ -Bp- -----Second FB----- -Bp- -----ThirdDS0-DS0 DS0 13/05:0 7168 DS0 8/02:0DS0-DS0 DS0 13/05:22 7169 DS0 8/02:22DS0-DS0 DS0 13/05:23 7170 DS0 8/02:23DS0-DS0 DS0 13/06:0 7171 DS0 12/02:0DS0-DS0 DS0 13/06:22 7172 DS0 12/02:22DS0-DS0 DS0 13/06:23 7173 DS0 12/02:23DS0-HDLC DS0 13/01:23 0-0,1DS0-HDLC DS0 13/04:23 0-0,2Total number of connections: 8Troubleshooting Tips
Troubleshooting and debugging can be performed using the following commands:
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For more information on these and other debug commands, refer to the Cisco IOS Debug Command Reference, Release 12.3.
Configuration Examples for Persistent TDM Switched Circuits
This section provides the following configuration examples:
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Configuring Persistent TDM Switched Circuits Example
The following sample output shows tdm-group 0 defined on T1 controllers 8/0:2, 12/0:2, 13/5, and 13/6 and shows each controller's timeslots (1,23-24) designated for hairpinning. Group tdm1 is defined, connecting T1 13/6's timeslots to T1 12/0:2's timeslots, and group tdm2 is defined, connecting T1 13/5's timeslots to T1 8/0:2's timeslots.
controller T1 8/0:2framing sftdm-group 0 timeslots 1,23-24!controller T1 12/0:2framing sftdm-group 0 timeslots 1,23-24!....!controller T1 13/5framing sflinecode amitdm-group 0 timeslots 1,23-24!controller T1 13/6framing sflinecode amitdm-group 0 timeslots 1,23-24!....!connect tdm1 T1 13/6 0 T1 12/0:2 0!connect tdm2 T1 13/5 0 T1 8/0:2 0....For an example of how the Persistent TDM Switched Circuits feature can be used to configure SS7 F-links, refer to "Chapter 5: Provisioning" in the Cisco AS5850 Universal Gateway Operations, Administration, Maintenance, and Provisioning Guide.
Verifying Persistent TDM Switched Circuits Example
The following example is output from the show connection all command and provides information about all of the configured connections on the gateway:
Router# show connection allID Name Segment 1 Segment 2 State======================================================================1 tdm1 T1 13/6 00 T1 12/0:2 00 UP2 tdm2 T1 13/5 00 T1 8/0:2 00 UPIn this example, the output from the show tdm connections command shows all of the defined TDM group connections on the gateway:
Router# show tdm connectionsConn Type -----First FB------ -Bp- -----Second FB----- -Bp- -----ThirdDS0-DS0 DS0 13/05:0 7168 DS0 8/02:0DS0-DS0 DS0 13/05:22 7169 DS0 8/02:22DS0-DS0 DS0 13/05:23 7170 DS0 8/02:23DS0-DS0 DS0 13/06:0 7171 DS0 12/02:0DS0-DS0 DS0 13/06:22 7172 DS0 12/02:22DS0-DS0 DS0 13/06:23 7173 DS0 12/02:23DS0-HDLC DS0 13/01:23 0-0,1DS0-HDLC DS0 13/04:23 0-0,2Total number of connections: 8Additional References
The following sections provide references related to the Persistent TDM Switched Circuits feature.
Related Documents
Cisco AS5850
Debug command reference
Voice command reference
Voice configuration
Standards
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.
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MIBs
RFCs
No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.
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Technical Assistance
Command Reference
This feature uses no new or modified commands. All commands used with this feature are documented in the Cisco IOS Release 12.3 command reference publications.
Glossary
DS0—Digital Signal level 0. Framing specification used in transmitting digital signals over a single channel at 64-kbps.
DS1—Digital Signal level 1. Framing specification used in transmitting digital signals at 1.544-Mbps on a T1 facility (in the United States) or at 2.108-Mbps on an E1 facility (in Europe).
MGCP— Media Gateway Control Protocol. A merging of the IPDC and SGCP protocols.
PRI— Primary Rate Interface. ISDN interface to primary rate access. Primary rate access consists of a single 64-kbps D channel plus 23 (T1) or 30 (E1) B channels for voice or data.
SS7— Signaling System 7. Standard CCS system used with BISDN and ISDN.
TDM—Time-Division Multiplexing.Technique in which information from multiple channels can be allocated bandwidth on a single wire based on preassigned timeslots. Bandwidth is allocated to each channel regardless of whether the station has data to transmit.
Note
Copyright © 2003 Cisco Systems, Inc. All rights reserved.
