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| | Item Number: | RBSU-REF | | Manufacturer: | Toshiba | | Condition: | Refurbished | | Description: | ISDN Basic Rate Interface Unit | | Price: | 50.00 | | Product Description:
The Basic Rate Interface (BRI) Unit provides two BRI S/T circuits. Each circuit provides two simultaneous voice and/or data connections with a single interface. BRI uses the 2B+D transmission format which is defined as two 64-kbps bearer channels and one 16-kbps data (control) channel. The D channel carries call setup control data. The RBSU BRI circuits can be connected to ISDN BRI network lines and/or ISDN S-type Terminal Equipment (TE-1) or Terminal Adapters (TA) on the station side. The RBSU/RBSS BRI circuits that are configured for the station side provide a passive bus that enables up to two TE1 and TA devices to be connected to one BRI circuit. When multiple TE1 and TA devices are installed on a singled RBSU/RBSS BRI circuit, the devices must share or contend for that circuit’s two B channels. A maximum of two simultaneous voice and/or data calls are allowed between all devices connected to the same BRI circuit. The contention rule for the two BRI B channels is first come, first serve. Network connections using BRI S/T type interface also require a dealer-supplied, UL-listed, external Network Terminal (NT-1) device. In Canada, the NT-1 must be CSA certified. Note RBSU/RBSS will be available with DK424 and DK40i Release 4.1
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