Toshiba Strata AirLink DK40i, Руководство по установке и обслуживанию

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ISDN Interfaces
BRI U Overview
16-2
Strata DK I&M 6/00
BRI U Overview
BRI U is available on all Release 4.3 processors for the DK40i, DK424 (including RCTUA4) and
the DK424i.
For BRI U services, the Strata DK40i, DK424, DK424i use the RBUU PCB. The DK40i can
also use the TBUU PCB. The RBUU provides two BRI U circuits that connect directly to
PSTN BRI lines; or, on the station side, connect to:
♦
U-type ISDN telephones and Terminal Equipment (TE-1-U)
♦
U-type Terminal Adapters (TA-U) with non-ISDN devices
Each TE-1-U and TA-U device can support voice and/or RS-232 switched-circuit data
depending on the device (see
Figure 16-1 ). The station-side BRI U circuits are point-to-point.
A subassembly (RBUS) can be attached to the RBUU for two additional BRIs for PSTN and/
or U-type station connections. The RBUU PCB and the RBUS subassemblies are shown in
Figures 16-23 and Figure 16-24 on Page 16-31 . The combination of RBUU and RBUS uses
only one slot to provide up to four U-type BRI circuits.
Notes
●
In DK424 or DK424i, each installed RBUU or RBUS circuit provides a 2B + D connection
and uses a system capacity of two station ports and two CO lines regardless of the circuit
application, even if the circuit is not actually connected.
●
In the DK40i, each TBUU, RBUU, or RBUS circuit uses two CO lines (no station ports) when
configured for the CO side and two station ports (no CO lines) when configured for the station
side.