User's Manual

Alarm Monitoring Connectivity Options
7-54 InterReach Unison Installation, Operation, and Reference Manual
CONFIDENTIAL D-620003-0-20 Rev K
7.8.4 POTS Line Sharing Switch Connection
Using a line sharing switch you can connect up to four modems to a single telephone
line. Testing was performed with a Teltone Line Sharing Switch, model number
M-394-B-01.
Figure 7-22 OA&M Connection using a POTS Line Sharing Switch
Up to 16 modems can be monitored using a single telephone line by cascading line
sharing switches, as shown in Figure 7-23.
Figure 7-23 Cascading Line Sharing Switches
Modem
PSTN
Line Sharing Switch
Up to 4 modems
per Switch
Modem
Modem
Straight-through
modem cable
PC running
or OpsConsole
Software
AdminManager
Straight-through
modem cable
External Modem
only with OpsConsole
Modem
PSTN
Line Sharing Switch
Line Sharing Switch Line Sharing Switch Line Sharing Switch Line Sharing Switch
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PC running
or OpsConsole
Software
AdminManager
Straight-through
modem cable
Straight-
through
modem
cables
External Modem
only with OpsConsole