ISDN Interfaces
RBSU/RBSS Interface Units
5-16 Strata CTX I&M 10/02
Step 6: Install RBSU/RBSS PCBs into Cabinet
After setting the switches and jumpers and installing the plug-on PCBs as described in the
preceding paragraphs, the RBSU/RBSS PCBs can be installed in the appropriate cabinet slots.
Refer to RBSU/RBSS Capacity and Cabinet Slot Information on Figure 5-13. After the RBSU/
RBSS is installed in the Strata CTX cabinet, the status LEDs and connecting jacks are positioned
as shown in Figure 5-12.
Table 5-5 RBSU/RBSS LED Indications
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 5-12. 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 5-4 and 5-12). If the R40S is installed on the RBSU, the PS-1 voltage is carried on the Tx/
Rx wires with polarity. (See Table 5-6).
The position of the TBSU BRI and RBSU/RBSS circuit jacks are shown in Figure 5-13 and 5-12
respectively.
LED Indication
BSY
Circuit Busy
On – Any B-channel is in use.
Off – B-channels are idle.
TS
Timing Source
Blinking On/Off – The RBSU is extracting the clock from the BRI line and is the
Primary synchronization circuit for ISDN and T1.
On – The RBSU is the secondary (backup) synchronization circuit for the ISDN
and T1.
Off – The RBSU is not used for ISDN or T1 synchronization.
LOS
Loss of Signal
On – Clock timing cannot be detected from the line.
Off – Normal condition.
FS
Frame Alignment Alarm
On – Frame alignment cannot be established.
Off – Frame alignment is established.
Table 5-6 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
3TxRx +
4RxTx +
5RxTx -
6TxRx -
7 N/C N/C N/C
8 N/C N/C N/C
87654321
3048
ront View of RJ-45 Jack Cavity
ote: The RJ-45 pins are numbered as shown above.
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