Справочник Пользователя для Lucent Technologies 8.2
DEFINITY ECS Release 8.2
Administrator’s Guide
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1318
DS1 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.
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
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
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