Toshiba Strata Dk14, Dk40i, Dk424 Installation And Maintenance Manual

ISDN Interfaces
RBSU/RBSS and TBSU Interface Units
Strata DK I&M 5/9914-25
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Figure 14-18 TBSU Switch Layout
NoteIt is normal for sockets IC7 and IC8 to be empty.
Table 14-10 TBSU Option Switches, Jumpers, and Connectors 
TBSU
CircuitOption 
SwitchTy p eCircuit TypeDescriptionTENT
All SW 1 Push-button N/A N/AResets firmware on all TBSU circuits. Drops calls off 
the TBSU.
1 SW 100 Jumper X X Causes the circuit
1 to operate as TE or NT.
1. Also requires Program *60 to set TE or NT.
1 SW 101...

ISDN Interfaces
RBSU/RBSS and TBSU Interface Units
14-26Strata DK I&M 5/99
Modular Jack Pin Configurations
BRI Circuit Jack (TE or NT Mode)
The TBSU and RBSU/RBSS BRI circuit jack is a shielded RJ-45 (8-pin modular) with Transmit 
(Tx) and Receive (Rx) pin numbers as shown in Figure 14-19. The Tx and Rx pin numbers change 
when the BRI circuit is configured with TBSU and RBSU/RBSS option switches for TE or NT 
(Tables 14-8 and 14-10). If the R40S is installed on the RBSU, the PS-1 voltage is carried on...

ISDN Interfaces
RBSU/RBSS and TBSU Interface Units
Strata DK I&M 5/9914-27
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TBSU and RBSU/RBSS 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 (see Figure 14-19 for the locations). When the DK system 
(TBSU and RBSU) has power (from AC source or batteries) there is a short circuit across TB1 and 
TB2. In the event of no power to the DK424, there is an...

ISDN Interfaces
RBSU/RBSS and TBSU Interface Units
14-28Strata DK I&M 5/99
A cord of up to 10 meters connects the ISDN BRI RJ-45 wall jack to the desktop TE-1 or TA RJ-
45 jack. Bellcore recommends that all TE-1 and TA devices be attached with the same standard 
cord to ensure compatibility.
Figure 14-20 Modular ISDN Data Cable
The standard pinouts for ISDN jacks is the TIA-568A or TIA-568B jack as listed in Table 14-12. 
The variants A and B to the TIA specification are electrically the same, only the...

ISDN Interfaces
RBSU/RBSS and TBSU Interface Units
Strata DK I&M 5/9914-29
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TBSU and RBSU/RBSS EMC Ferrite Core Requirement
To ensure that the TBSU and RBSU/RBSS circuits meet the EMC requirements, it is necessary to 
run all wire connecting TBSU and RBSU/RBSS circuits (TE mode and NT mode) through a 
Ferrite core. Use Toshiba part number, FER-CORE-ISDN, which is shipped with the TBSU and 
RBSU. Figures 14-21 and 14-22 show how to dress the wiring through the Ferrite core.
Connecting TBSU...

ISDN Interfaces
RBSU/RBSS and TBSU Interface Units
14-30Strata DK I&M 5/99
Figure 14-23 TBSU or RBSU to NT1 Point-to-point Connection
Connecting TBSU and RBSU/RBSS Station Devices (NT-Mode)
S-type TAs and TE-1s can be connected to the station side of TBSU, RBSU, and RBSS circuits. 
TA and TE devices must be powered by local AC power using AC adapter supplied with the TA or 
TE device. The TBSU and RBSU/RBSS circuits must be configured in the NT mode when 
connected to TA and TE devices (refer to option...

ISDN Interfaces
RBSU/RBSS and TBSU Interface Units
Strata DK I&M 5/9914-31
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maintains control of polarity. The pinout from the TBSU and RBSU/RBSS circuit to a S-type TE-
1 or TA device is shown in Figure 14-24 and Ta b l e  1 4 - 11.
Figure 14-24 TBSU and RBSU/RBSS NT Circuit Pinout on Passive Bus
As a parallel bus, the TBSU and RBSU/RBSS BRI-NT passive bus will accept TE-1 and TA 
devices scattered on the bus; however, the locations of the TE and TA devices on the S bus is 
limited by...

ISDN Interfaces
RBSU/RBSS and TBSU Interface Units
14-32Strata DK I&M 5/99
TBSU and RBSU/RBSS Passive Bus Configurations
The placement of S-type TE and TA devices on the BRI S-passive bus is critical for good TBSU 
and RBSU/RBSS BRI circuit performance. Figures 14-25~14-28 show four passive bus 
architectures that are known to work. In all installations, follow the guidelines of any of these 
passive-bus models using the wire, cables, and jacks described in the previous paragraphs.
Figure 14-25...

ISDN Interfaces
RBSU/RBSS and TBSU Interface Units
Strata DK I&M 5/9914-33
ISDN Interfaces
Figure 14-27 Extended Passive Bus
Figure 14-28 Short Passive Bus
3340
TR
165082
RJ-45
TBSU or
RBSU/RBSS  
NT-Mode
TRISDN Telephone TE-1 PC Card
3341
TR
640 490
RJ-45
TBSU or
RBSU/RBSS  
NT-Mode
TRISDN Telephone TE-1 PC Card 

ISDN Interfaces
RBSU/RBSS and TBSU Interface Units
14-34Strata DK I&M 5/99
TBSU and RBSU/RBSS BRI Call Monitor
The call-monitor jack located on the TBSU and RBSU enables you to use a PC or ASCII terminal 
to monitor the BRI, D-channel call setup, layer-2 and layer-3 data (refer to Figure 14-8 on Page 
14-13 for information about connecting the monitor jack). Figures 14-29 and 14-30 provide 
examples of BRI call setup message information that is available from the TBSU and RBSU call-
monitor jack.
Figure...