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Feature Reference
DS1 trunk service
1514
Administrator’s Guide for Avaya Communication Manager
November 2003
DS1 trunk service
Digital Signal Level 1 (DS1) trunk service uses bit-oriented signaling (BOS) and multiplexes 24 channels
(T1 service) or 32 channels (E1 service) into a single data stream. DS1 can be used for voice or
voice-grade data and for data-transmission protocols. T1 trunk service multiplexes 24 channels into a
single 1.544-Mbps data stream. E1 trunk service multiplexes 32 channels into a single 2.048-Mbps
stream. Both T1 and E1 provide a digital interface for trunk groups.
For information about how to administer DS1 with enhanced administration, see
Signaling modes
on
page 1516.
Brief description
DS1 trunk service provides a digital interface for the following trunks.
•
Voice-grade DS1 tie trunks
•
Alternate voice/data (AVD) DS1 tie trunks
•
Robbed-bit AVD (RBAVD) DS1 tie trunks
•
Digital Multiplexed Interface (DMI) tie trunks
•
Integrated Services Digital Network-Primary Rate Interface (ISDN-PRI) trunks
•
Central Office (CO) trunks
•
Foreign Exchange (FX) trunks
•
Remote-access trunks
•
Wide Area Telecommunications Service (WATS) trunks
•
Direct Inward Dialing (DID) trunks
•
Main/Satellite tie trunks
•
Tie trunks that link Common-Control Switching Arrangement (CCSA) or Enhanced Private
Switched Communications Service (EPSCS) networks
•
Release-link trunks for Centralized Attendant Service (CAS)
•
Access trunks
•
Off-premises stations (also known as station-side DS1)
•
Access endpoints
DS1 also provides the following functions in public and private networks:
•
Electronic tandem networks (ETN) or tandem tie-trunk networks (TTTN)
•
Direct access to local exchange carriers
DS1 operational and signaling parameters
The table below provides the recommended combination of parameters for each DS1 interface.