Nortel Networks BCM200/400 - Manual (Page 128)

128 Chapter 8 Installing a media bay module (MBM)
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GATM switch settings
There are two models of GATM:
GATM 4: The GATM 4 provides connections for four analog calling line identification (CLID) or
supervision disconnect PSTN lines. Each voice line uses one line in the DS30 bus offset. Because
each DS30 bus has four lines per offset, you can assign a maximum of four GATM4s to a single
DS30 bus by making the offset switch settings different for each MBM.
GATM 8: The GATM 8 provides connections for eight analog calling line identification (CLID)
or supervision disconnect PSTN lines. Each line uses one line in the DS30 bus offset. Because
each DS30 bus has four lines per offset, you require two offsets for each GATM 8. You can assign
a maximum of two GATM 8s to a DS30 bus by making the offset switch settings different for each
MBM.
You can also combine a GATM 8 with a 4x16 on the same DS30 number. When you choose an
offset number for the GATM 8, the system automatically adds the next offset number. You cannot
assign offset 3 to the GATM 8 because this does not allow the MBM to assign the second set of
lines.
There are two sets of DIP switches located on the rear of the GATM:
• The left set allows you to determine the DS30 bus and offset for the MBM.
• The right set allows you to manually configure a country profile operation, which is required
for earlier versions of software.
However, BCM 3.6 and newer software supports downloadable firmware for the North America,
Taiwan, UK, and Australia telephony profiles. BCM 3.6.1 and newer versions of BCM software
also support the Poland profile (in download mode only). To allow the GATM to download the
parameters for these countries and to allow for firmware upgrades, set all the country DIP switches
to 0 (zero/off) (factory default). The MSC telephony profile you choose must support the
appropriate country setting to ensure that the correct firmware installs. Refer to
Figure 72 .
Figure 72 GATM switch settings
1 2 3 4 5 6
ON
Mode select Country select
ON
1 2 3 4 5 6 7 8
Rear of GATM For BCM 3.6 and newer software,
ensure all switches
are off
Dip # Function
1 Reserved
2 Reserved
3 Reserved
4 Reserved
5 Reserved
6 Country 3
7 Country 2
8 Country 1