TSC-ADM (Administered temporary signaling connections)

Last Updated : Jul 07, 2015 |
Prolog information
Metadata
Keywords:
MO name in log
Alarm level
Initial command to run
Full name of MO
TSC-ADM
None
None
Administered Temporary Signaling Connections (TSC-ADM, also called ADM TSCs)
No alarms are generated for TSC-ADM or ADM TSCs.
Administered temporary signaling connections (TSC) provide a path through ISDN-PRI networks for supplementary D-channel messages. ISDN-PRI applications such as the Distributed Communications System (DCS) use temporary signaling connections to exchange user information across an ISDN-PRI network. What makes administered TSCs unique is that these particular TSCs stay active for an extended period of time, similar to a permanent data connection. These ADM TSCs are used for DCS features that require Non-Call Associated (NCA) TSCs, and the ADM TSC provides the logical channel function in a DCS network.
An NCA TSC is a virtual connection established within a D-channel without associating any B-channel connections. The connection provides user-to-user service by exchanging user information messages without associated B-channel connections.
An administered TSC is a special NCA TSC defined for the DCS over the ISDN-PRI D-channel. The ADM TSC has an administratively defined endpoint and is established for an extended period of time.
There are two types of ADM TSCs:
  • Permanent: these are established by the originating PBX, near-end ADM TSC or by the terminating PBX, far-end ADM TSC. Once these ADM TSCs are established, they remain active.
  • As needed: these are established only when needed.
ADM TSC maintenance provides a strategy to verify that a far end can respond to an ISDN-PRI User information TSC heartbeat message, thereby indicating that user-user signaling is functioning. In addition, maintenance can retrieve the status of the ADM TSC’s connection state.
Since ADM TSCs are administered on a per signaling-group basis, the health of an ADM TSC also depends on the state of the D-channel or D-channel pair administered per signaling group. See ISDN-SGR (ISDN-PRI Signaling Group) documentation for details on ISDN-PRI NFAS and D-channel backup maintenance.
The two administration commands for ADM TSCs are as follows:
  • add signaling-group number
  • change signaling-group number
The two maintenance commands for ADM TSCs are:
  • test tsc-administered signaling-group-number/tsc-index
  • status tsc-administered signaling-group-number/tsc-index