ISDN Interfaces
RBSU/RBSS Interface Units
Strata CTX I&M 10/02 5-17
ISDN Interfaces
Monitor Jack
The RBSU/RBSS monitor jack is an RJ12 (6-pin modular). This jack provides an RS-232 output
that enables you to monitor the RBSU/RBSS BRI circuit D-channel, layer-2 and layer-3 data. The
monitor jack pin configuration and communication parameters are the same as RPTU and RBUU
(see Figures 5-30, 5-33 and 5-34). For RBSU monitor jacks, see Figure 5-32 and Figure 5-12 on
page 5-18.)
RBSU/RBSS Premise Wiring Guidelines
Power Failure Terminal Screws
TB1 and TB2 are the connecting points that interface a pair of dry contacts that can be used for
power failure switching purposes (see Figure 5-12 for the locations). When the Strata CTX system
has power (from AC source or batteries) there is a short circuit across TB1 and TB2. In the event
of no power to the Strata CTX, there is an open circuit across TB1 and TB2. The specifications for
TB1 and TB2 contacts are:
• Maximum switchable voltage: 30VDC
• Maximum switchable current: 80mA
• Short circuit resistance: Approximately 15 ohms
Grounding Terminal Screws
TB3 is a screw terminal that can be used to connect a ground wire to the RBSU PCB (see Figure
5-12 for the location). This ground enables the RBSU/RBSS to meet Electro Magnetic
Compatibility (EMC) requirements. The RBSU complies with EMC requirements without
grounding TB3 on the RBSU, so it is not necessary to connect a ground wire to TB3.
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