The Primary Rate system
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1–3
1.3 The Primary Rate Interface Module
As with all Shelf System cards, the Primary Rate Interface Modules
(SBUPRI) comprise a front and a rear card. Both front and rear cards
are not interchangeable between the CBUPRI/E1, SBUPRI-23 and
SBUPRI-30 modules. See
Figure 1
in section
2.2
.
The SBUPRI work in conjunction with other modules in the Primary Rate
system, ‘standalone’ operation is not possible. The SBUPRI provide up
to 30 ‘B’ channels (23 for USA) for use by other application cards in the
Primary Rate system.
The CBUPRI/E1 and SBUPRI-30 works with ‘Euro’ Primary Rate (I.421)
ISDN. The SBUPRI-23 works with US National standard (Bellcore NI-2).
All 3 types have a physical interface provided by an RJ45 connector.
1.4 Shelf Manager Module (SBUGSM or SBULSM)
The Shelf Manager Module is responsible for configuring the cards and
for collecting ALERTs from all application cards. A full description of the
Shelf Manager Module can be found in the SBU Systems User Guide,
which is provided as part of the documentation set.
1.5 Quad User Modules
These modules are in two forms; the Quad Low Speed Module
(SBUQLS/SBUQLB) and Quad High Speed Module
(SBUQHS/SBUQHB). Please see the Quad User Modules manual for
further details.
Additional module types will be added to the system in due course as
part of the continuing development program on these products. Further
supporting manuals will be produced for additional modules.
1.5.1 Quad Low Speed Module (SBUQLS/SBUQLB)
The SBUQLS provides four rate adapted User ports per card offering
standard V.24, X.21, and V.35 interfaces. The interfaces are chosen by
selection of the desired type of interface card for all four ports. Each
port has Talkwire capability.