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THE DIGITAL LOSS PLAN
4-3
TABLE 4-1. Digital Loss Plan Encodes
Encode
0
1
2
3
4
5
6
7
8
Loss-Plan Function
ANSI/EIA/TIA-464-A-1989
Designator
The digital fixed-loss plan pad loss is determined
—
by the trunk type administered in procedure 100, word 1
ISL tie trunk S/DTT
EIA tie trunk (recommended for ISDN)
D/TT
ISL digital CO
D/CO -3/3 loss
EIA digital CO
D/CO 0/6 loss
digital toll office
D/TO
analog toll office
A/TO
N12A (AUTOPLEX™ NETWORK Interface V)
—
N12B (AUTOPLEX NETWORK Interface Y)
—
Although the digital loss plan provides for the assignment of a loss-pad group independent of port
type (analog or digital), there are certain restrictions. Administration does not provide for alternate
port appearance on DS1 port circuit packs for the following labeled pad groups: analog tie trunk,
analog CO trunk (terminal balanced), analog CO trunk (not balanced).
For System 85 R2, the digital loss plan may be implemented in phases, dependent on the switch
version and software issue. The digital fixed-loss plan is implemented in System 85 R2V3 with issue
1.0 software. System 85 R2V3 issue 1.1 software provides for administering the ISL tie-trunk pad
group. The complete digital low-loss plan is initially available with R2V4 1.0 generic. It is planned
(as a class AC change) to provide the complete plan with System 85 R2V2 issue 1.4 software and
System 85 R2V3 issue 1.2 software.
The TSI arithmetic logic unit (ALU) under module processor control actually inserts (digitally) the
administered quantity of loss in the connection. The TN380D module processor (or later) is required
for providing the full digital low loss plan. Therefore, to implement any portion of the low loss plan,
it is essential to have both the appropriate hardware (TN380D) and software issue. A network
consisting of some nodes that implement the fixed-loss plan and other nodes that implement the low
loss plan are permitted. However, their transmission performance is the same as for an all fixed-loss
network.
Generic 1
Generic 1 implements the full digital loss plan (excluding the two AUTOPLEX
®
pad groups) when
configured with either System 75 R1V2 issue 1.4, R1V3 issue 1.1, or R1V4 issue 1.0 software. The
appropriate loss value is administered, for the particular trunk group, by entering T# in the NAME
field for screens on pages 2 though 5 of the trunk-group member assignments. Noted below are the
minor differences in names (terminology) used for Generic 1 and those used for Generic 2. The
following list identifies the option values: