Toshiba Strara CTX Series - Remote Expansion Cabinet Unit

Strata CTX670 Installation
3-42
Strata CTX I&M September 2002
Remote Expansion Cabinet Unit
The RRCU1A PCB enables a
CTX670 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 fibre-optic pair.
One fibre 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.
A CTX670 Base Cabinet will
support up to five RRCU1A PCBs. A
CTX670 will support up to four
Remote Expansion Cabinets.
An inter-cabinet Data Cable in the
Base Cabinet is attached to an
RRCU1A which converts the signal
and uses an LED source to apply the
signal to 500 MHz/km multi-mode
fibre. Another RRCU1A in the
Remote Expansion Cabinet receives
the LED signal, converts it back to
its original form and applies it to a
ribbon Data Cable connected to the
Remote Expansion Cabinet. See
Figure 3-29.
This is a hardware solution and has
no effect on software or
administration. Remote cabinets support all line and trunk interfaces. Network clock signals can only
be derived from digital trunks installed in the Base Cabinet (Master) location.
RRCU1A cards are used at both the Base (Master) and Remote (Slave) Cabinet locations. The card set
consists of an RRCU1A PCB and its ROMS1A daughter board. The RRCU1A connects to the inter-
cabinet Data Cables, holds the Remote/Slave option jumpers, and has an RS-232C port for monitoring
the fibre connection. (See Figure 3-32.)
The ROMS1A daughter board holds an SC-type fibre connector, a connector for control of two
8-circuit DPFT units, and status LEDs.
Fiber Optic
Connection
Up to
3 Kilometers
(Dealer Supplied)
Expansion Cabinet (2)
Base Cabinet
Remote Expansion Cabinet (4)
MSBU
Remote Expansion Cabinet (3)
5820
1 (M1)
2 (S1)
3 (M2)
2
3
4
5
6
7
Optical Module
4 (S2)
1 (M1)
2 (S1)
3 (M2)
Optical
Module
4 (S2)
Local CTX Cabinets
Remote CTX Cabinets
Figure 3-29 Remote Expansion Cabinet Connection