Isdn Primary Rate Interface Unit (Rptu) (Dk424 Only); Isdn S/T-Type Basic Rate Interface Unit (Rbsu) - Toshiba Strata DK14 General Description Manual

The RDTU is available for systems operating with a RCTUBA/BB, RCTUC/D or RCTUE/F
common control unit. The RDTU normally requires the installation of a Channel Service Unit,
which is not supplied by Toshiba. RDTU T1/DS-1 digital voice channels can be configured for SF
or ESF format and either AMI or B8ZS line coding
The new RDTU2, installed in a DK424 Release 4.0 system, supports the hook flash capability.
"SuperTrunk" requires hook flash operation on T1 two-way DID/DOD lines. The RDTU1 can be
upgraded to support hook flash.
In most locations within the U.S., network connection using RDTU2 requires a dealer-supplied,
UL-listed external CSU or in Canada, a CSA-certified CSU.

ISDN Primary Rate Interface Unit (RPTU) (DK424 only)

The Primary Rate Interface Unit is a 24-channel PRI card, which provides 1 data (control) channel
and 23 bearer channels (available in Release 4.0). All B channels appear and program as CO lines
in the DK424 system and can be individually configured for local service, FX, WATS, DID, Tie,
etc., service operation. Network connection using the RPTU requires a dealer-supplied, UL-listed,
external CSU in most locations in the U.S. In Canada, the CSU/DSU must be CSA certified.
The RPTU is supported by the RCTUBA3/BB4, RCTUC3/D4 and RCTUE3/F4. See
Primary Rate Interface (PRI)" on Page 73

ISDN S/T-type Basic Rate Interface Unit (RBSU)

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.
Basic Rate Interface Subassembly (RBSS)
The RBSS attaches to the RBSU to provide two additional BRI S/T type circuits that can be
used for station-side connections only. An RBSU with the RBSS subassembly provides four
BRI circuits in one card slot.
RBSU/RBSS stations can be voice and/or data devices, such as ISDN telephones and Terminal
Adapters, that support the standard S-type interface. Each RBSU/RBSS circuit provides two B
channels, plus one D channel and reduces the system's basic capacity by two station ports and
two CO lines. See
Note RBSU/RBSS will be available with DK424 and DK40i Release 4.1.
Strata DK General Description
for more information.
"ISDN Basic Rate Interface (BRI)" on Page 73
5/99
(see Table 23).
for more information.
Universal Slot PCBs
CO Line PCBs
"ISDN
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