maximum number (144) of ACD/OSPS positions is assigned to the ACD/OSPS RISLU] from the DFI facilities
perspective.
If the ACD/OSPS RISLU's DFI mode is FE (DFI MODE field of RC/V view 22.9), then Section 11.6.2.6 (PSU
PIDB considerations) must be consulted prior to the conversion.
To be certain that no problems exist on ACD/OSPS RISLU prior to the conversion, diagnose all the equipped
DFIHs and the RISLU (both CCs and CDs) circuit packs. ``All Tests Passed'' (ATP) results must be achieved
before continuing.
Routine Exercises (REX) should be inhibited on the SM under conversion to prevent diagnostic interference
with the conversion.
Back up the ODD on the SM under conversion to keep a copy of the most up-to-date ODD.
CAUTION:
Recent Change procedures in this conversion cannot be backed out. Ensure that all aspects of
the conversion have been completed prior to performing Recent Changes. All Transmission
Equipment changes must be performed prior to changing RISLU DFI modes.
11.6.2.1 DFI-RH Facility Considerations - ROSPS CD Configuration
1.
The North America DS-1 digital transmission facility (DFI-RH pair) with OSPS DFI mode (FE8Z or FE) at
maximum occupancy can support 18 ACD/OSPS positions. With the ERISLU, however, each facility can
support a maximum of only 17 or 16 ACD/OSPS positions when the DFI mode is B8ZS (clear channel) or
ZCS (non-clear channel), respectively.
2.
Since each DFI-RH pair with ROSPS (no spare facility) or SPROSPS (with spare facility) configuration has
more capacity (can support more ACD/OSPS positions) than a DFIRH pair with RACTSTBY configuration,
any ACD/OSPS RISLU to be converted that has the CONFIG attribute of ROSPS (RC/V 22.9) may need to
add one additional DFI H2/R2 pair prior to the conversion to prevent traffic blocking after the conversion is
completed.
3.
For example, if the ACD/OSPS RISLU (CONFIG=ROSPS) has 72 ACD/OSPS positions with 4 DFI-RH pairs
(18
4) and the DFI mode is FE (that is, the new DFI mode is ZCS), then another DFIRH pair must be added
or 8 ACD/OSPS [72-(16
4)] positions must be reassigned (to another RISLU or unassigned from the
converting RISLU) prior to the conversion.
4.
Similarly, if the ACD/OSPS RISLU (CONFIG=ROSPS) has 72 ACD/OSPS positions with 4 DFI-RH pairs
(18
4) and the DFI mode is FE8Z (that is, the new DFI mode is B8ZS), then another DFIRH pair must be
added or 4 ACD/OSPS [72-(17
4)] positions must be reassigned (to another RISLU or unassigned from the
converting RISLU) prior to the conversion.
5.
Table 11.6-1 summarizes the maximum number of ACD/OSPS positions versus the number of active DFI
facilities for each type of RISLUs involved in the conversion.
Table 11.6-1 Maximum Number of ACD/OSPS Positions
NUMBER
MAX POSITIONS
MAX POSITIONS
MAX POSITIONS
OF ACTIVE
FOR
FOR ERISLU
FOR ERISLU
FACILITIES
ACD/OSPS RISLU
WITH B8ZS DFI MODE
WITH ZCS DFI MODE
2
36
34
32
3
54
51
48
4
72
68
64
5
90
85
80
6
108
102
96
7
126
119
112
8
144 (max)
136
128
9
-
153
144
235-105-210
October 1999
Copyright © 1999
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