Tbsu Premise Wiring Guidelines - Toshiba Strata DK40 Installation & Maintenance Manual

TBSU Two-circuit ISDN BRI Interface Unit
Monitor Jack
The TBSU monitor jack is an RJ-11 (6-pin modular). This jack provides an RS-232 output
that enables you to monitor the TBSU BRI circuit D-channel, layer-2 and layer-3 data. The
monitor jack pin configuration and communication parameters are:
Figures 2-25
monitor jack output.

TBSU 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
system (TBSU) has power (from AC source or batteries) there is a short circuit across TB1
and TB2. In the event of no power to the DK40, there is an open circuit across TB1 and TB2.
The specifications for TB1 and TB2 contacts are:
Maximum switchable voltage: 30 VDC
Maximum switchable current: 80mA
Short circuit resistance: Approximately 15 ohms
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 TBSU circuit and the station Terminal Equipment (TE).
Normally the CAT5 wiring does not have to be shielded when used for ISDN BRI premises
wiring. However, the RJ-45 jacks on the TBSU BRI circuits are shielded and provide an earth
shield in the event that shielded modular plugs and cable are used.
Note
TBSU BRI Cable Jacks and Connectors
The standard connector for ISDN equipment is the eight-pin RJ45 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.
The standard pinouts for ISDN jacks are as per the list in
Strata DK40 I&M Manual Spring 1999
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
Speed = 9600
Data Bits = 8
Parity = None
Stop Bits = 1
Flow Control = None
and 2-26 on pages 2-47
If using shielded cable and plugs, cable runs should only be earthed at the DK
TBSU, RJ-45 jack. To prevent earth loops, do not earth both ends of shielded cable
runs.
and 2-48, respectively, show examples of the TBSU
(see Figure 2-21 for the locations). When the DK
Table
DK40 Installation
2-12.
2-41