Installation guide

48x Server Installation Guide
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Version: 1. Revised: July 15, 2010
Page 13
8 Analog Telephony
Caution: To reduce the risk of fire, use only 26 AWG (or larger) UL listed or CSA certified
telecommunications line cord.
The server’s analog phone connections can be used to connect Central Office (CO) lines or telephone
handsets. Table 5 below describes the ports:
RJ-11 Ports Type Description
1-3 FXO (loop-start) Used to connect to Central Office (CO) lines
4-8 FXS Telephone handsets
Table 5: Analog Telephony Ports
It is recommended that the ports be connected as follows:
• CO Lines: Begin with port 1 and move up.
• Telephone Handsets: Begin with port 8 and move down.
The Power Fail Phone port may be used to connect an analog phone device that is operational in the event
that the server loses power or fails. During power failure, it automatically connects to the first outside phone
line port (port 1).
Surge protection is provided internally on all telephony interfaces.