2 - 2 D e s c r i p t i o n
2-Mb/s Remote Periperal Equipment Appendix 1 to 553-2741-200
Note: Although the QSD66 PE expansion shelf provides dual-loop
capabilities, the shelf can only be used in a single-loop mode when
operating with RPE.
Loop assignment
Remote loops are defined in groups in software using Overlay Program
52 (refer to 553-2321-310 and 553-2321-311 for Generic X08, and 553-
2931-200 and Appendix 1 to 553-2311-311 for Generic X11 with
Supplementary Features). Each group can be assigned four members.
Loops are assigned from left to right on the RPE shelf. Circuit packs for
each loop are located in the following slots in the RPE shelf:
• slots 2 and 3 for the first loop (LM0 in software)
• slots 5 and 6 for the second loop (LM1 in software)
• slots 10 and 11 for the third loop (LM2 or LM3 in software).
Spare loop
When a spare loop is assigned to a shelf, it must be connected to the
third loop on the shelf and defined as loop member LM3 in software.
Note: The spare loop cannot be defined as LM0, LM1 or LM2 in
software.
Bus terminating units
Each QSD74 RPE shelf requires three Bus Terminating Units (BTUs).
When used in a QCA146 cabinet (remote end), three QPC477A23 BTUs
are required. When used in a QCA136 or QCA141 CE cabinet (local
end), three QPC477A24 BTU are required.
Connectors for inserting the BTU are located between slots 3 and 4, 6
and 7, 9 and 10 at the front of the RPE shelf.
