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 si ngle 1.54 4-Mbps da ta
stream. E1 trunk service multiplexes 32 channels into a single 2.048-Mbps s tream.
Both T1 and E1 provide a digital interface for trunk groups.
For information about how to administer DS1 with enhanced administr ation, 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