Lucent Technologies MERLIN LEGEND Release 7.0 System Planning Manual page 87

MERLIN LEGEND Communications System Release 7.0
System Planning 555-670-112
2 Control Unit Configuration
Planning Module Placement
NOTES:
— (All modes) Current 012 (T/R), 008 OPT, and 016 (T/R)
modules have built-in ring generators and are compatible
with earlier releases. The 012 (T/R) module [517J13 (28)]
has a ring equivalency number (REN) of 2.2 and rings only
four ports at a time, although eight jacks can be used for
applications. The 016 T/R module (517C34) has a REN of
4, can ring 16 ports at a time, and has no restriction on the
number of jacks that can be used for applications. The 412
LS-ID-ETR and 016 ETR modules (Release 7.0 and later
systems) have a REN of 3 and can ring all tip/ring ports at the
same time.
— Group all 800 DID, 100D, 800 NI-BRI, and 400EM modules
together according to type; this helps save time in system
programming.
Due to limitations in the 391A, 391A1, and 391A2 power supplies, the
number of 800 NI-BRI modules plus 100D modules in a single carrier
cannot exceed three. If you have more than three modules, you must
install the additional modules in an expansion carrier. This restriction
does not apply to the 391C1 or 391A3 power supply.
The 391C1 power supply has a maximum rating of 96 unit loads; the
391A3 power supply has a maximum rating of 72 unit loads. If your
system contains a 391A1 or 391A2 power supply module, and the unit
loads for that carrier will exceed 48, a 391C1 or 391A3 power supply
should be installed in the system.
Due to power supply limitations, the maximum number of MLX
telephones per carrier can vary, as shown in
April 1999
Table 2-1.
Issue 1
2-5