Version 6.0 25 February 2010
Installation Manual 2. Installing the Device
2.4.7 Connecting to E1/T1 Trunks for PSTN Fallback
PSTN fallback is supported when the device houses one or two TRUNKS modules, each
providing two or four spans. In the event of a power failure, a relay connects trunks 1 to 2,
and/or trunks 3 to 4 of the same module. The link is provided by the closing of a metallic
switch inside the module so that the Trunk from the PBX is routed from the module to the
PSTN.
Figure 2-13: Mediant 1000 Digital Lifeline Cabling (e.g., Trunks 1 and 2)
¾ To connect the digital trunk interfaces for 1+1 or 2+2 PSTN Fallback:
On the same TRUNKS module, connect Trunk 1 and Trunk 3 to your PBX, and Trunk
2 and Trunk 4 to the PSTN.
Notes:
• PSTN Fallback is supported only between ports on the same TRUNKS
module.
• PSTN Fallback is supported only for ISDN when the number of supported
channels (e.g., 30) is less than the maximum number of possible
channels provided by the physical ports (e.g., two E1 trunks). When the
number of supported channels (e.g., 60) equals the maximum number of
channels provided by the physical ports (e.g., two E1 trunks), then other
protocols such as CAS are also supported.
• This PSTN Fallback feature has no relation to the PSTN Fallback
Software Upgrade Key.
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