Nortel Networks 400 4.0, BCM200 manual Setting offsets, DS30 model

110Chapter 8 Installing a media bay module (MBM)

Figure 64 DS30 model

DS256 on MSC

DS30 buses available to modules in a 2/6 split

DS30 bus #2

DS30 bus #3

DS30 bus #4

DS30 bus #5

DS30 bus #6

DS30 bus #7

Four offsets per bus

DS30 buses

available to modules in a 3/5 split

DS30 numbers are set using the number 4, 5, and 6 DIP switches on the back or underside of the MBMs. The exception is the FEM MBM. The FEM DIP switches turn on ports, each of which consumes one bus.

Setting offsets

Each offset represents one-quarter of a DS30 bus. Each bus supports 16 lines (32 time slots) for most MBMs.

Note: Double Density

The 32 time slots are important when you are working with station MBMs. The DSM16+, DSM32+, ASM8+, and GASM8 can be configured, using the offset DIP switches, to use each of these time slots as separate telephone lines. This, essentially, doubles your system telephone capacity.

Exceptions:

•DTM MBMs, which support 23 to 30 lines per bus

•FEM MBMs, where each bus supports one Norstar fiber module connection.

Offsets are numbered 0, 1, 2, and 3. MBMs that require less than a full bus can be assigned a DS30 number and an offset number. This allows more than one MBM to be assigned the same DS30 number, but with a different offset number.

MBMs that can have offsets assigned include CTM4, CTM8, BRIM S/T, ASM8+, and GASM8. For example, two CTM8s can be assigned to the same DS30 number, with different offset numbers. However, you cannot assign a CTM8 and a BRIM to the same DS30.

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