Nortel Networks BCM1000 - Manual (Page 17)

BCM1000, BCM 3.5 addendum 17
P0607659 02 BCM1000 Installation and Maintenance Guide
The figure below shows the front of the GATM module. Note that both the GATM4 and the GATM8 have
only one amphenol connector. The firmware differentiates how many lines the connector supports.
There are two models of GATM:
GATM 4: The GATM4 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. Since each
DS30 channel 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 module.
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. Since each DS30 bus
has four lines per offset, you require two offsets for each GATM8. You can assign a maximum of two
GATM8s to a DS30 bus, by making the offset switch settings different for each module. You can also
combine a GATM 8 with a 4X16 module 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 module, because this does not allow the module to assign the second set of lines.
The following figure graphically shows how you can allocate the GATM modules over a DS30 bus.
Power LED
Status LED
Amphenol
connector
4 GATMs
GATM8s
per DS30
channel
One DS30 Bus/
offset 0, 1, 2, or 3 One DS30 Bus/
offset set to 0, 1, or 2
per DS30
channel
max. of
2 offsets
2 GATM4s
Combined allocation
over one DS30 Bus
1 GATM8
1 GATM8 (offset 0)
Combined allocation with 4X16
using two DS30 buses
1 4X16 module
(offset 0 and 1)
(offset 2)
(offset 3 on the
(offset 2 is empty)
first DS30 bus) (a maximum of
two GATM8s per bus)