Instruction manual

Networking and connectivity
555-233-767136 Issue 4 May 2003
DS1 trunk service
Bit-oriented signaling that multiplexes 24 channels into a single 1.544-Mbps
stream. DS1 can be used for voice or voice-grade data and for data-transmission
protocols. E1 trunk service is bit-oriented signaling that multiplexes 32 channels
into a single 2.048-Mbps stream. Both DS1 and E1 provide a digital interface for
trunk groups. Digital Service 1 (DS1) trunks can be used to provide T1 or ISDN
Primary Rate Interface (PRI) service.
Echo cancellation — with UDS1 circuit pack
The universal DS-1 (UDS1) circuit pack (TN464GP/TN2464BP) available for all
Communication Manager platforms has echo cancellation circuitry. The echo
cancellation capability of the circuit pack is intended only for channels supporting
voice communication. It is not desirable to provide echo cancellation over
channels supporting data communication.
The TN464GP/TN2464BP is intended for Communication Manager customers
who are likely to encounter echo over circuits connected to the public network.
The occurrence of echo is likely if Communication Manager is configured for
complex services such as ATM or IP. In addition, echo is likely to occur if
Communication Manager interfaces to local service providers who do not
routinely install echo cancellation equipment in all their circuits.
E1
Communication Manager also supports E1 connections. T1/E1 access and
conversion allows simultaneous connection to both T1 (1.544 Mbps) and E1
(2.048 Mbps) facilities (using separate circuit packs).
T1
When planning your networking requirements, one of the options you should
consider is multiplexing over digital services 1 (DS1) facilities.
Flexible billing
See ‘‘Flexible billing’’ on page 55.