AT&T MERLIN LEGEND Communications System PBX System Planning Manual page 90

Trunks
DS1 Facilities Ordering
Discussion
See your AT&T representative or
authorized dealer for the current release
and version numbers of the system
After the contract is signed, your AT&T representative or authorized dealer
contacts the DS1 facility vendor to discuss the T1/lSDN-PRl service order. The
vendor needs information about the communications system as well as
customer identification.
Table 3-6 describes the kind of information the facilities vendor requires. Review
this table with your network representative or dealer so that you will be familiar
with the details of the DS1 facilities order.
Table 3-6 Guide to DS1 Facilities
Communication System
Manufacturer
Model
Type (Mode)
Jack Type
Facility interface Code
Digital PBX
Has the EIA standard CISA transmission path
Is slenderized
Is the equipment that must be timed
Has an internal stratum clock level of 4
Provides automatic call distribution through Group Calling feature
Provides Ioopback (keep signal alive) through CSU
Channel Service Unit
Manufacturer AT&T
Model 551-T1 L1
Reg. Number GI 472-
26819-DE-N
Facility Interface Codes:
Standard CSU jacks and test points provided
Audible Ringing Source
Digital PBX
AT&T
Testing Service
If a CSU other than those listed above is used, AT&T will not accept the
responsibility for its installation, connection, or testing.
Echo Control Device —
Ordering
AT&T
MERLIN LEGEND
digital PBX
RJ48C or RJ48X
Digital D4 Framing 04 DU9-B
Digital ESF Framing 04DU9-C
Digital ESF and B8ZS 4DU95
AT&T
ESF-T1
GIC 472-
16544-DE-N
Digital D4 Framing 04DU9-B
Digital ESF Framing 04 DU9-C
Digital ESF and B82S 4DU95
Channel Service
not used
Other
Trunk Options 3-35