Connecting Tbsu And Rbsu To Network Side (Te-Mode) - Toshiba STRATA DK14 Installation And Maintenance Manual

DK BRI Circuit EMC Ferrite Core Requirement
To ensure that the DK BRI circuit meets the EMC requirements, it is necessary to run all wire
connecting ISDN BRI circuits (TE, LT mode and NT mode) through a Ferrite core. Use Toshiba
part number, FER-CORE-ISDN, to order the ferrite core. It is not shipped automatically with the
BRI circuit cards, it must be grounded separately.
wiring through the Ferrite core.
RBSU or RBUU
RBSS or RBUS
ISDN
PRI Jack
4697 Tie
Wrap
Ferrite Core
FER-CORE-ISDN
Note: Locate the Ferrite core
as close as possible to
the BRI modular jack.
Figure 16-15 BRI Circuit Ferrite Core Installation

Connecting TBSU and RBSU to Network Side (TE-Mode)

The TBSU and RBSU only, not the RBSS, circuits can be connected to the network side of a BRI
line. The TBSU and RBSU circuits must be configured in the TE-mode (refer to option switches in
Table 16-10 on Page 16-18
In the U.S., the BRI line from the ISDN service provider is a two-wire U-type BRI line. This line
connects to the TBSU or RBSU TE circuit via a customer-provided NT1 as shown in
16-17. The NT1 is necessary to convert the network BRI, two-wire, U interface to the TBSU or
RBSU BRI, four-wire, T interface. The NT1 must be UL listed (U.S.) or CSA certified (Canada).
The NT1 is powered by local AC power via an AC adapter supplied with the NT1. The connection
between the NT1 and the TBSU or RBSU TE circuit is a point-to-point connection, so the NT1 can
connect to only one TBSU or RBSU BRI TE circuit.
A 100-ohm Terminating Resistor (TR) is required on each end of the point-to-point connection.
The TR must be switched into the TBSU or RBSU TE circuit (refer to option switches in
16-12 on Page 16-21
Strata DK I&M 6/00
CAT 3, 4,
or 5 Cable
One Turn
Figure 16-16 BRI Circuit Ferrite Core Installation
and Table 16-12 on Page 16-21
and Table 16-10 on Page 16-18) and into the NT1 device.
RBSU/RBSS and TBSU Interface Units
Figures 16-15 and 16-16 show how to dress the
TBSU1A
or TBUU
FS FS
LOS LOS
TS TS
BSY BSY
CAT 3, 4,
or 5 Cable
Tie Wrap
Ferrite Core
FER-CORE-ISDN
Note: Locate the Ferrite core
as close as possible to
the TBSU or TBUU.
and Program *60).
ISDN Interfaces
4729
One
Turn
Figure
Table
16-25