Connecting Tbsu Station Devices (Nt-Mode) - Toshiba Strata DK40 Installation & Maintenance Manual

TBSU Two-circuit ISDN BRI Interface Unit

Connecting TBSU Station Devices (NT-Mode)

S-type TAs and TEs can be connected to the station side of TBSU circuits. TA and TE
devices must be powered by local AC power using AC adapter supplied with the TA or TE
device. The TBSU circuits must be configured in the NT mode when connected to TA and TE
devices (refer to option switches in
The TA enables you to connect non-ISDN voice and data devices to ISDN BRI circuits. The
TA matches the protocol of existing interfaces (R-reference point) to the ISDN S/T protocol.
TA devices include asynchronous circuit-switched adapters that convert RS-232 async data
(like data from a PC COM port) to B-channel 64 kbps sync.
TAs also enable you to connect standard telephones and non-ISDN fax machines to receive
and make calls over ISDN circuits. TEs include any user device (telephone, fax, PC video
conference board) that is designed to plug directly into the ISDN (S/T) interface without the
use of a TA.
The TBSU BRI-NT interface supports a point-to-multipoint connection on two twisted pairs.
Up to eight TE and/or TA devices can be connected to one TBSU, BRI-NT circuit. Using
standardized wiring and modular connectors, as explained in previous paragraphs, maintains
control of polarity. The pinout from the TBSU circuit to a S-type TE or TA device is shown in
Figure 2-24
TBSU
TE-Circuit
Insert 100-ohm
TR using TBSU
option switches.
TBSU NT Circuit
Figure 2-24 TBSU NT Circuit Pinout on Passive Bus
As a parallel bus, the TBSU BRI-NT passive bus will accept TE and TA devices scattered on
the bus; however, the locations of the TE and TA devices on the S bus is limited by timing
Strata DK40 I&M Manual Spring 1999
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
and Table 2-9.
RJ-45
Pinout
3
6
4
5
BRI (Four-wire)
3
S-type, TEs or TAs without
100-ohm terminating resistors
(maximum eight TEs or TAs per
TBSU circuit).
Table 2-9 on Page 2-39
RJ-45
Pinout
3
6
4
5
6 4 5
To local
AC Power
DK40 Installation
and Program *60).
S-type, TE or TA with
100-ohm TR or just a
100-ohm terminating
resistor across each pair
on a RJ-45 jack.
To local
AC Power
2-45