Version 6.0 19 February 2010
Installation Manual 2. Installing the Device
2.4.3 Connecting to E1/T1 Trunks
The device supports up to two E1/T1 trunk interfaces, providing up to two RJ-48c ports.
When implementing two trunks, the device can support PSTN Fallback, allowing trunks to
connect to the PSTN during a power outage (i.e., no communication with the IP network).
The device also supports fractional E1/T1.
Warning:
To protect against electrical shock and fire, use a 26 AWG min wire to
connect T1 or E1 ports to the PSTN.
¾ To connect the E1/T1 trunks:
1. Connect the E1/T1 trunk cables to the device's RJ-48c ports.
2. Connect the other ends of the trunk cables to your PBX/PSTN switch.
RJ-48c trunk connectors are wired according to the figure below.
Figure 2-7: RJ-48c Connector Pinouts for E1/T1
The digital trunks can also be connected in such a way as to support PSTN Fallback in
case of power outage, as described in the procedure below:
¾ To connect the digital trunk interfaces for PSTN Fallback:
For a 1+1 Fallback option, connect Port I to your PBX, and Port II to the PSTN. If the
power fails, a relay connects Trunk I to II, acting as a Fallback for PSTN trunks.
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