DS0 loop-around test call

Last Updated : Apr 28, 2014 |
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The DS0 loop-around feature provides a loop-around connection for incoming non-ISDN DS1 trunk data calls. This feature is similar to the far-end loop-around connection provided for the ISDN test call feature. Using this DS0 loop around, a network service provider can perform facility testing at the DS0 level before video teleconferencing terminals are installed at the PBX.
The feature is activated on a call-by-call basis by dialing a test call extension specified on the System Parameters Maintenance screen. No special hardware is required. When the test call extension is received by the PBX, a non inverting 64-kbps connection is set up on the PBX's time division multiplexed bus. More than one loop-around call can be active at the same time.
For calls routed over the public network using the ACCUNET Switched Digital Service (SDS) or Software-Defined Data Network (SDDN), the data-transmission rate is 56 kbps since robbed bit signaling is used. For calls established over a private network using common-channel signaling, the full 64-kbps data rate is available.
On the Trunk Group screen:
  • You can set the communications type to data when the incoming trunk group is used only for data calls (SDS).
  • You can set the communications type to rbavd (robbed bit alternate voice data) when the incoming trunk group is used for robbed bit alternate voice and/or data (SDN/SDDN).
  • You can set the communications type to avd for private network trunks using common channel signaling.