Rbsu/Rbss Premise Wiring Guidelines - Toshiba Strara CTX Series Installation And Maintenance Manual

jack pin configuration and communication parameters are the same as RPTU (see
and 5-25). For RBSU monitor jacks, see

RBSU/RBSS Premise Wiring Guidelines

Grounding Terminal Screws
TB3 is a screw terminal that can be used to connect a ground wire to the RBSU PCB (see
for the location). This ground enables the RBSU/RBSS to meet Electro Magnetic Compatibility (EU)
requirements. The RBSU complies with EU requirements without grounding TB3 on the RBSU, so it
is not necessary to connect a ground wire to TB3.
BRI Wire Type Recommendations
CAT5 wire is recommended for ISDN BRI customer-premises wiring. While the ISDN BRI signal
works for some distance over almost any wire that is suitable for analogue voice service, better wire
enables longer runs. CAT5 provides better 100-ohm impedance matching (at little extra cost) between
the RBSU/RBSS circuit and the station Terminal Equipment (TE-1).
Normally the CAT5 wiring does not have to be shielded when used for ISDN BRI premises wiring.
However, the RJ45 jacks on the RBSU/RBSS BRI circuits are shielded and provide a ground shield in
the event that shielded modular plugs and cable are used.
If using shielded cable and plugs, cable runs should only be grounded at the Strata CTX
Note
RBSU/RBSS, RJ45 jacks. To prevent ground loops, do not ground both ends of shielded cable
runs.
Figure 5-12 RBSU/RBSS Location of LEDs and Connector Locations
RBSU/RBSS BRI Cable Jacks and Connectors
In the U.K., the standard connector for ISDN equipment is the eight-pin RJ jack. Patch cables have
eight-pole plugs at both ends. The same pinout applies to both ends of an ISDN cable, which is the
practice of the data world. This means that a flat untwisted cable with an RJ modular plug at both ends
Strata CTX I&M September 2002
Figure 5-23
RBSU
BSY
TS
CKT2
LOS
FS
BSY
CKT1
TS
LOS
FS
RJ-45 8-pin (shielded)
Modular Connector
TB3 (FG)
Reset Switch
(resets RBSU Firmware)
RS-232C Connector
for Call-Data Monitor
2795
and Figure 5-12 on page
RBSS
BSY
CKT4
TS
LOS
FS
BSY
TS
CKT3
LOS
FS
4th Circuit
2nd Circuit
3rd Circuit
1st Circuit
TB1 and TB2 (PFT)
ISDN Interfaces
Figures 5-21, 5-24
5-15.)
Figure 5-12
5-15