Toshiba Strara CTX Series Installation And Maintenance Manual page 30

Strata CTX Configuration
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.)
Basic Rate Interface Subassembly (RBSS)
Attaches to attaches to RBSU. One RBSS
subassembly per RBSU.
Two ISDN BRI, S point circuits (2B+D each).
ISDN Primary Rate Interface Unit (RPTU2)
Provides (1~30B + D) channels (lines).
RPTU2 is required for QSIG Networking.
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.
Loop Start Exchange Line Interface Subassembly
(RCOS)
Provides four additional Loop Start Exchange lines.
One RCOS subassembly per RCOU.
Remote Expansion Cabinet Unit (RRCU)
Supports two CTX670 remote cabinets. 62.5 mµ,
multi-mode fibre.
Tie Line Unit (REMU2)
Provides four analogue Tie line circuits.
Tie Line Unit (PACU2)
Provides four analogue Tie line circuits.
Table 1-11 Option PCBs
Option Interface Unit (BIOU)
1-16
Interface Options: Network and/or station side.
Interface Options: Station side only.
Interface Options:
ISDN PRI
QSIG
Interface Options:
Exchange analogue loop start lines
Same as RCOU.
Remote cabinet not supported by main system reserve
power.
Interface Options:
E&M Tie lines
Two- or four-wire transmission
Immediate start
Wink start
AC 15 Tie lines
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).
Strata CTX I&M September 2002