Nortel Networks BCM200, 400 4.0 manual Digital station media bay module, DSM 16+ DSM 32+

	Chapter 2	Introducing the BCM hardware 57
Table 9 Station MBMs (Sheet 2 of 2)
MBM	What it does		Special notes
ASM/ASM8	Connects a maximum of eight analog
(see “Analog station media bay modules”	devices to the BCM system.
on page 58)
ASM8+/GASM	Connects a maximum of eight analog
(see “Analog station media bay modules”	devices to the BCM system.
on page 58)	The GASM provides the following
	additional services: caller ID, pass
	through, message waiting indication, and
	disconnect supervision at the telephone.
	The GASM also allows you to download
	new firmware.
Note: Refer to “Market profile attributes” on page 351 for supported regions.

Digital station media bay module

The digital station media bay modules (DSM) support digital telephones on the BCM system. This section describes the DSM16(+) and DSM32(+) MBMs (see Figure 31).

The DSMs have the following characteristics:

•DSM16(+) — supports 16 digital telephones through one RJ-21 connector. Set the double density switch to enable the DSM to carry 16 extensions over a half DS30 bus. If required, install a second DSM16(+) and set the double density switch to occupy the second half of the DS30 bus to expand the number of extensions to 32.

•DSM32(+) — supports 32 digital telephones through two RJ-21 connectors. A DSM32(+) operating in single-density mode occupies two DS30 buses. Set the double density switch to enable the DSM to carry 32 extensions over a single DS30 bus.

Note: Devices that share a DS30 bus must be similar. Use two DSM16(+) module in double density mode on a single DS30 bus. Do not mix a DSM16(+) module with a DSM32(+) module over a single DS30 bus.

Figure 31 DSM faceplate LEDs and connectors

DSM 16(+) DSM 32(+)

BCM200/400 4.0 Installation and Maintenance Guide