Nortel Networks 400 4.0, BCM200 manual BCM400 expansion gateway, Ddim faceplate LEDs and connectors

62Chapter 2 Introducing the BCM hardware

•provides the functionality of a DTM (T1 digital lines only)

•splits the incoming T1 line so that some of the lines are used for voice traffic and some of the lines are used for data traffic

•provides either the channel service unit (CSU) or data service unit (DSU) functionality to support connections to data terminal equipment (DTE), such as a router or a bridge

•connects to network devices that support V.35 interfaces

•provides end-to-end transparent bit service

•supports loopbacks between the BCM system and the internal BCM components, and between the BCM system and digital terminal equipment

Figure 35 shows the DDIM faceplate LEDs and connectors.

Figure 35 DDIM faceplate LEDs and connectors

Data module serial port	10101	TxD	RxD	RTS	CTS	DCD	DSR	TM
Power LED
Status LED
In Service LED
Loopback test LED
Continuity loopback				Loopback
Receive LEDs				RJ-48C digital telephone line
Transmit LEDs				connector

BCM400 expansion gateway

The BCM400 expansion gateway is available in standard and redundant configurations for BCM400 systems only.

The BCM400 expansion gateway kit (North America only) consists of a BCM400 main unit and enough VoIP gateway trunk authorization codes to enable 48 ports of VoIP trunks. The BCM400 expansion gateway, combined with the BCM400 host system, provides a maximum of 192 TDM sets, instead of 160, while communicating to the PSTN through TDM trunks on the expansion gateway. The VoIP trunks connect the two systems and allow the BCM400 expansion gateway to tandem from IP trunks to the PSTN/TDM trunks (see Figure 36 on page 63).

The addition of a second BCM400 expansion gateway provides up to two T1 PSTN trunks. This releases enough system resources on the host BCM400 main unit for the addition of 64 digital telephones.

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