Lucent Technologies Definity Enterprise Communication Server 8.2 User Manual

Page of 1707
DEFINITY ECS Release 8.2
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. 
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