ISDN Interfaces
5-14
Strata CTX I&M September 2002
Step 5:
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 5-4 RBSU/RBSS LED Indications
Modular Jack Pin Configurations
BRI (S/T) Circuit Jack (TE or NT Mode)
The 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 RBSU/RBSS option switches for TE or NT (Tables 5-3 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 5-5).
The position of the RBSU/RBSS circuit jacks are shown in Figure 5-13 and 5-12 respectively.
Monitor Jack
The RBSU/RBSS monitor jack is an RJ11 (6-pin modular). This jack provides an RS-232 output that
enables you to monitor the RBSU/RBSS BRI circuit D-channel, layer-2 and layer-3 data. The monitor
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 synchronisation circuit for ISDN.
On – The RBSU is the secondary (backup) synchronisation circuit for the ISDN.
Off – The RBSU is not used for ISDN synchronisation.
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 5-5 RJ45 Pins in the 8-pin Modular Jack
Pin
No.
TE
Side
NT
Side
PS1/R40S
Polarity
1N/CN/C N/C
2N/CN/C N/C
3TxRx +
4RxTx +
5RxTx -
6TxRx -
7N/CN/C N/C
8N/CN/C N/C
87654321
3048
Front View of RJ-45 Jack Cavity
Note: The RJ-45 pins are numbered as shown above.
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