Digital Service Unit (Dsu) Cabinet - Mitel SX-2000 Light General Information Manual

SX-2000 General Information Guide

Digital Service Unit (DSU) Cabinet

Note: The DSU cabinet has been discontinued; however, it is still supported.
A Digital Service Unit (DSU) cabinet holds up to four DSU cards and two FIMs. The DSU
cards provide digital trunk interfaces for public or private network access and specialized
digital functions (such as messaging, expanded conferencing, and ISDN service). The
FIMs support the transmission of voice and data signals between nodes.
The DSU cabinet consists of the following components:
• Cabinet Frame: The DSU cabinet is separated into two shelves. Shelf 1 is located at the
bottom of the cabinet and Shelf 2 is located at the top of the cabinet (both shelves are at
the front of the cabinet). Shelf 1 consists of slots 1 to 6 and contains 2 FIMs and 4 DSUs.
Shelf 2 consists of two Peripheral Resource Cards (PRCs).
• Power Supply: The 200 Watt AC or 150 Watt DC power supply provides power for the
cabinet. The power supply fan cools the cabinet.
• Peripheral Resource Cards: The peripheral resource cards provide additional circuitry to
support the distributed architecture. These cards are installed in Shelf 2, slots 1 and 6.
• Fiber Interface Modules (FIMs): The DSU cabinet holds up to two fiber interface modules
(FIMs). Each FIM supports two DSU cards; the FIM installed in Shelf 1, slot 1 supports the
DSU cards in Shelf 1, slots 2 and 3. The FIM in Shelf 1, slot 6 supports the DSU cards in
Shelf 1, slots 4 and 5.
• DSU Cards: The DSU cabinet holds up to four DSU cards. These are intelligent cards that
provide specialized digital functions. The DSU cards are installed in Shelf 1, slots 2 to 5.
30