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Rack Mount Cabinets
Remote Expansion Cabinet Unit
Strata CTX I&M 06/04 5-35
Rack Mount Cabinets
Remote Expansion Cabinet Unit
The RRCU1A PCB enables a Rack Mount Expansion Cabinet to be located up to three kilometers
from its Base Cabinet. One RRCU1A connects to up to two ribbon-type Data Cables and applies
the inter-cabinet signal to a fiber-optic pair. One fiber pair can support one or two expansion
cabinets in one remote location using one RRCU1A in the Base Cabinet and another in the Remote
Expansion Cabinet.
All instructions apply to both the Base Cabinet and the Remote Expansion Cabinet except where
specifically noted.
Note See “Remote Expansion Cabinet Unit” on page 4-55 for additional information.
Remote Cabinet Installation Instructions
1. Install cabinets according to the instructions given at the beginning of this chapter. Pay
particular attention to wiring and grounding instructions given for Remote Expansion Cabinets.
2. If installing a standalone Remote Expansion Cabinet, or the first in a stack, set the “BASE/
EXP” switch to “BASE” in accordance with Figure 5-12.
3. Cabinets in which RRCU cards are installed must be modified to protect the routing of the
cables through the cabinet.
• Attach the plastic guide to the bracket
provided with the RRCU1A card
(shown right).
• Attach the bracket to the wall of the
cabinet.
4. Install the RRCU Card (see Figure 4-36
on page 4-53 for a detailed description of
RRCU)
• Select correct jumper options. On the
Master side, both option plugs connect
the center pin to the upper pin (M1,
M2). On the Slave side, both option
plugs connect the center pin to the lower pin (S1, S2).
• Remove the protective rubber cap from the fiber connector on the ROMS1A daughter
board.
Important! When installing the RRCU, be sure to put the card in the slot before attaching the
data cables. Detach the data cable before removing an RRCU1A. Failure to do so
may cause interference with other data highways.
5. Insert the cards
• On the Master side, the RRCU card may be installed in Slots 1~8.
• On the Slave side, the RRCU card may be installed in Slots 1~10.
• The RRCU1A is a non-timeslot card and can be installed in slots normally left vacant
adjacent to digital trunk cards.
Spiral Tube
Optical Fiber
Clamp Bracket
For Spiral Tube