3Com S330 manual Connecting to the Voice Compression Module, Lists the VCM T1-DSX pinouts

Installation Procedures 55

CBR Module LEDs The CBR module features the following front panel indicators:

Inservice (green)—Powers up in the “off” state and illuminates when you set the administrative status of the T1-DSX/E1 or serial port to In Service. See “Configuring the CBR Module” in Chapter 4 for details about how to set the administrative status of the ports on the CBR module.

ALARM (red)—Powers up in the “off” state and illuminates when an alarm condition is detected on the corresponding T1-DSX/E1 or V.35 line.

Figure 25 PathBuilder S330 CBR Module LEDs

Alarm

Inservice

T1-DSX/E1 ports

Serial (RS-366 and V.35/RS-449/ RS-530/X.21) port

Connecting to the Voice Compression Module

The Voice Compression module provides an RJ48 DSX interface for T1-DSX/E1 traffic. Line Build Outs (LBOs) to DSX of up to 655 feet are supported. You must configure the LBOs in the VCM Port Configuration Menu. See “Configuring the Voice Compression Module” in Chapter 4, for details. You can typically make local connections to DTE equipment without DSU/CSUs, as long as the equipment supports a direct T1-DSX/E1 interface and can recover a T1-DSX/E1 signal.

Table 21 lists the VCM T1-DSX pinouts.

Table 21 VCM T1-DSX/E1 Pinouts

PIN 1	RX (ring)
PIN 2	RX (tip)
PIN 3	NC
PIN 4	TX (ring)
PIN 5	TX (tip)
PIN 6	NC
PIN 7	NC
PIN 8	NC

If you are using a G703 coax physical connection to connect the E1 line to the interface, you must use the E1 Balun Adapter (part number 3C63904).