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T1/E1 Interface Module with VComp Bundles Overview

You can use both full and fractional T1 and E1 interface modules with voice compression modules to interconnect PBX voice switches over the IP/MPLS network.

T1 interfaces use channel-associated signaling (CAS). You can enable or disable CAS on T1 interfaces. E1 interfaces can use either CAS or common channel signaling (CCS).

  • With CCS, signaling information is transmitted on a separate channel from the data, and the signaling channel controls multiple data channels.

  • With CAS, also known as per-trunk signaling (PTS), routing information is used to direct the payload of voice or data to its destination. The routing information is encoded and transmitted in the same channel as the payload itself.

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