Toshiba Strara CTX Series, Installation And Maintenance Manual, Page: 30 / 290

Strata CTX Configuration
1-16
Strata CTX I&M September 2002
Table 1-10 Exchange Line PCBs
ISDN S/T-type Basic Rate Interface Unit (RBSU)
Two ISDN BRI S/T point circuits (NT or TE). Each
circuit is 2B+1D. (Host for the RBSS.) Interface Options: Network and/or station side.
Basic Rate Interface Subassembly (RBSS)
Attaches to attaches to RBSU. One RBSS
subassembly per RBSU.
Two ISDN BRI, S point circuits (2B+D each).
Interface Options: Station side only.
ISDN Primary Rate Interface Unit (RPTU2)
Provides (1~30B + D) channels (lines).
RPTU2 is required for QSIG Networking.
Interface Options:
ISDN PRI
QSIG
Loop Start Exchange Line Interface Unit (RCOU)
Provides four Exchange analogue loop start line
circuits.
With RCOS, provides eight Exchange analogue loop
start line circuits.
Interface Options:
Exchange analogue loop start lines
Loop Start Exchange Line Interface Subassembly
(RCOS)
Provides four additional Loop Start Exchange lines.
One RCOS subassembly per RCOU.
Same as RCOU.
Remote Expansion Cabinet Unit (RRCU)
Supports two CTX670 remote cabinets. 62.5 m
µ
,
multi-mode fibre.
Remote cabinet not supported by main system reserve
power.
Tie Line Unit (REMU2)
Provides four analogue Tie line circuits. Interface Options:
E&M Tie lines
Two- or four-wire transmission
Immediate start
Wink start
Tie Line Unit (PACU2)
Provides four analogue Tie line circuits. AC 15 Tie lines
Table 1-11 Option PCBs
Option Interface Unit (BIOU) Interface Options:
Provides Paging output (600 ohm and three-watt amp),
four zone paging relays, three MOH interfaces and four
control relays (Night Transfer and BGM mute).