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T1 12-PORT ACCESS MULTIPLEXOR MODULE
2.1 Bandwidth Selection
The T1 Module provides 8 bandwidth options for the T1 link, as mentioned above.
Two switch banks (12 switches per bank) located on the circuit board are used to
select the default bandwidth. The switches affect the operation of the T1
connection only. These switches are paired in groups of two, with each group
affecting a single T1 port. Table 2-1 depicts switch/port associations.
Table 2-1. Upper and Middle Switch Bank Switches
Upper
1-2
3-4
5-6
7-8
9-10
11-12
Table 2-2 indicates the switch settings used to determine the default speed setting
per port. When operating a port as a fractional T1 line, the equipment requires
contiguous timeslots.
Switch #1
ON
OFF
ON
OFF
In addition, a third (lower) switch bank is provided to select the following for all of
the T1 lines.
6
2. Installation
Port 1
Port 2
Port 3
Port 4
Port 5
Port 6
Table 2-2. Switch Settings
Switch #2
ON
ON
OFF
OFF
Middle
1-2
Port 7
3-4
Port 8
5-6
Port 9
7-8
Port 10
9-10
Port 11
11-12
Port 12
Timeslots
1-24
1-18
1-12
1-6
Bandwidth
1.536 Mbps
1.152 Mbps
768 kbps
384 kbps
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