Toshiba Strata AirLink DK40i, Installation And Maintenance Manual

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ISDN Interfaces
RBSU/RBSS and TBSU Interface Units
16-22
Strata DK I&M 6/00
Modular Jack Pin Configurations
BRI (S/T) Circuit Jack (TE or NT Mode)
The TBSU and RBSU/RBSS BRI circuit jack is a shielded RJ45 (8-pin modular) with Transmit
(Tx) and Receive (Rx) pin numbers as shown in
Figure 16-13 . 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 16-10 and 16-12 ). If the R40S is installed on the RBSU, the PS-1 voltage is carried on the
Tx/Rx wires with polarity. (See Table 16-13 ).
The position of the TBSU BRI and RBSU/RBSS circuit jacks are shown in Figure 16-12 and
16-13 respectively.
Monitor Jack
The TBSU and RBSU/RBSS monitor jack is an RJ12 (6-pin modular). This jack provides an RS-
232 output that enables you to monitor the TBSU and 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 and RBUU which are shown in
Figure 16-33 on Page 16-43 . Figures 16-36 and 16-37 on
Pages 16-46 and 16-47 , respectively, show examples of the TBSU or RBSU monitor jack output.
Figures 16-35 and 16-13 show the location of the TBSU and RBSU monitor jacks respectively.
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 16-13 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 or DK424i, there is an open circuit across TB1 and
TB2. The specifications for TB1 and TB2 contacts are:
♦
Maximum switchable voltage: 30VDC
♦ Maximum switchable current: 80mA
♦
Short circuit resistance: Approximately 15 ohms
Grounding Terminal Screws
TB3 is a screw terminal that can be used to connect a ground wire to the RBSU PCB (see Figure
16-13 for the location). This ground enables the RBSU/RBSS to meet Electro Magnetic
Compatibility (EMC) requirements. As of Release 4.1, RBSU complies with EMC requirements
without grounding TB3 on the RBSU, so it is not necessary to connect a ground wire to TB3.
Table 16-13 RJ45 Pins in the 8-pin Modular Jack
Pin
No. TE
Side
NT
Side
PS1/R40S
Polarity
1 N/C N/C N/C
2 N/C N/C N/C
3 Tx Rx +
4 Rx Tx +
5 Rx Tx -
6 Tx Rx -
7 N/C N/C N/C
8 N/C N/C N/C
87654321
3048
Front View of RJ-45 Jack Cavity
Note:
The RJ-45 pins are numbered as shown above.