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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1318DS1 Trunk Service
20
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, refer
to ‘‘
Signaling modes’’ on page 1320.
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
■ 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