Toshiba CTX28 manual Modular Jack Pin Configurations, Install RBSU/RBSS PCBs into Cabinet

ISDN Interfaces

RBSU/RBSS Interface Units

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 7-14. After the RBSU/ RBSS is installed in the Strata CTX cabinet, the status LEDs and connecting jacks are positioned as shown in Figure 7-14.

Table 7-9 RBSU/RBSS LED Indications

LED	Indication
	Circuit Busy
BSY	On – Any B-channel is in use.
	Off – B-channels are idle.
	Timing Source
	Blinking On/Off – The RBSU is extracting the clock from the BRI line and is the
TS	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.
	Loss of Signal
LOS	On – Clock timing cannot be detected from the line.
	Off – Normal condition.
	Frame Alignment Alarm
FS	On – Frame alignment cannot be established.
	Off – Frame alignment is established.

ISDN Interfaces

Modular Jack Pin Configurations

BRI (S/T) Circuit Jack (TE or NT Mode)

The RBSU 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 7-14. The Tx and Rx pin numbers change when the BRI circuit is configured with RBSU and RBSU/RBSS option switches for TE or NT (Tables 7-8and 7-14). If the R40S is installed on the RBSU, the PS-1 voltage is carried on the Tx/ Rx wires with polarity. (See Table 7-10).

The position of the RBSU BRI and RBSU/RBSS circuit jacks are shown in Figures 7-14and 7-15respectively.

Strata CTX I&M 06/04 7-19