Toshiba Strata DK40 - Capacity and Cabinet Slot Information; PS-1 Backup Power Option

RBSU/RBSS ISDN Basic Rate Interface Unit DK40 Universal Slot PCBs
Strata DK40 I&M Manual Spring 1999
3-45
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
the same BRI circuit. The contention rule for the two BRI B-channels is first come, first
served.
Figure 3-24 RBSU/RBSS Interfaces between the S/T Reference Points
Capacity and Cabinet Slot Information
The RBSU/RBSS can be installed in any slot in the Expansion KSU Cabinet (Slots 15 ~ 18).
Each RBSU and/or RBSS contains two circuits and each circuit reduces the system capacity
by two station ports or two exchange lines (one port/line per B-channel). Therefore, if the
RBSU PCB is installed, and configured for TE mode, the exchange line count will increment
by four lines. If the RBSU is configured for NT mode, the station count will increase by four
stations.
The RBSU PCB can only be configured for NT mode.
A maximum of two RBSU and RBSS PCBs can be installed in the DK40 system. The total
number of RBSU/RBSS circuits allowed in the DK40 is shown in Table 3-13.
* RBSU circuits can be NT or TE, but RBSS circuits can only be NT.
PS-1 Backup Power Option
The RBSU provides an optional backup power supply, R40S, that will supply backup power
to TE devices in the event of an AC power loss. The R40S is also used in the instances where
some connected devices may require extra power. This power backup option only applies to
RBSU or RBSS circuits that are configured in the NT mode. Refer to Figure 3-28 to see how
to install the R40S onto the RBSU.
Also the DK40 system must have battery backup to allow the R40S power backup function to
operate. The R40S power supply is an ISDN, PS-1 type power unit which means it supplies
Table 3-13 RBSU/RBSS, BRI-TE, and BRI-NT Maximums
Processor
Maximum
RBSU/RBSS*
PCBs combined
Maximum
BRI-TE
Circuits
Maximum
BRI-TE
Channels
Maximum
BRI-NT
Circuits
Maximum
BRI-NT
Channels
DK40 4 4 8 8 16
RX
TX
DK40
RBSU/RBSS
NT1
RX
TX
ISDN
RX/TX
UTS
BRI
(2-wire)
BRI-TE
(4-wire)
BRI-NT
(4-wire)
RBSU ST ref points
S, T, and U are ISDN reference points.
TE = S-type Terminal Equipment
TA = S-type Terminal Adaptor
TE
or
TA
1
8
...
TE
or
TA