Rbsu/Rbss Premise Wiring Guidelines - Toshiba strata CT Installation & Maintenance Manual

ISDN Interfaces
Monitor Jack
The RBSU/RBSS monitor jack is an RJ11 (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 which are shown in
Pages 10-29
Figure 10-21

RBSU/RBSS Premise Wiring Guidelines

Earthing Terminal Screws
TB3 is a screw terminal that can be used to connect an earth wire to the RBSU PCB (see
Figure 10-10
Compatibility (EMC) requirements. As of Release 4.1, RBSU complies with EMC
requirements without earthing TB3 on the RBSU, so it is not necessary to connect an earth
wire to TB3.
BRI Wire Type Recommendations
CAT5 wire is recommended for ISDN BRI customer-premises wiring. While the ISDN BRI
H
signal works for some distance over almost any wire that is suitable for analog 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.
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.
Note
C
10-16
Figure 10-19 on Page
and 10-30, respectively, show examples of the RBSU monitor jack output.
shows the location of the RBSU monitor jack.
for the location). This earth enables the RBSU/RBSS to meet Electro Magnetic
If using shielded cable and plugs, cable runs should only be grounded at the CT
RBSU/RBSS, RJ45 jacks. To prevent ground loops, do not ground both ends of
shielded cable runs.
10-26. Figures 10-22 and
Strata CT I&M Manual October 2000
10-23 on