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COMSPHERE 3000 Series Carrier
3-22 December 1994 3000-A2-GA31-80
Shared Diagnostic Unit (SDU)
Installation
An SDU (Figure 3-14), which is a circuit card designed
to mount in the slot at the extreme left end of the carrier
(Slot 0), is required under either or both of the following
conditions:
• The DSUs or dial/lease modems in the carrier are to
be controlled by an NMS.
• Multiple carriers in a cabinet configuration are to
be controlled from a single SDCP.
The SDU is not required for a single carrier without an
NMS interface or a single carrier with an SDCP installed.
At the rear of the SDU circuit card are four modular
jacks (Figure 3-15). From the top down, these jacks are as
follows:
• CC IN (6-pin)
• CC OUT (6-pin)
• FP IN (8-pin)
• FP OUT (8-pin)
SDU status indicators are defined in Table 3-3.
Below these connectors are two sets of DIP switches:
S2 (The top DIP switch) is used to specify the
carrier address (1–8) so that each device in
a cabinet configuration has a unique iden-
tity. Only the first three switches (S2-1
through S2-3) are operational; the fourth
switch (S2-4) is reserved for future use.
S1 (The bottom DIP switch) is used to specify
the diagnostic protocol to be supported
(DPII, ADp, or DMC), and the CC or DC
operation to be supported for DPII and ADp
protocol modes.
Preinstallation Inspection
Check the SDU for physical damage. Ensure that the
circuit card and faceplate are not damaged. If the SDU
shows signs of damage, report it immediately to your
shipping representative and also to your AT&T Paradyne
representative. Otherwise, install the unit.
Figure 3-14. SDU Faceplate