Filter
Top Products
96 Chapter 4 Selecting the media bay modules for your system
P0993298 02
Setting Offsets
Each offset is one-quarter of a DS30 channel. Each DS30 channel, supports 16 lines (32 time slots)
for most modules.
Exceptions:
• DTM modules support 23 to 30 lines per channel
• FEM modules, where each DS30 channel supports one Norstar fiber module connection.
Offsets are numbered 0, 1, 2, and 3. Modules that require less than a full DS30 channel can be
assigned a DS30 channel number and an offset number. This allows more than one module to be
assigned the same DS30 channel number, but with a different offset number.
Modules that can have offsets assigned include CTM, CTM8, BRI, and ASM 8. For example, two
CTM 8s can be assigned to the same DS30 channel number, with different offset numbers.
However, you cannot assign a CTM8 and an BRI module to the same DS30 channel.
Offsets are assigned using DIP switches 1, 2, and 3 on the media bay module.
Figure 28 shows how a DS30 channel containing 16 line connections is broken down into four
offset groups of four lines each.
Figure 28 Offsets are part of DS30 channel line groups
Note: Media bay modules that do not or cannot share DS30 channels always assign the
offset as 0 (zero). As well, if the module requires more than one DS30 channel, such as the
4x16 module, only the first DS30 channel is set on the DIP switches. The next consecutive
DS30 channel number is automatically assigned by the module.
1 DS30 channel
(16 lines)
Offset 0
Offset 1
Offset 2
Offset 3
Offsets
have
four lines
each