Connecting Phone Extensions to SPA2100
Document ID: 108789
Contents
IntroductionHow many telephone units can I connect on each FXS port of the
SPA2100?Related Information
Introduction
This article is one in a series to assist in the setup, troubleshooting, and maintenance of Cisco Small Business
products.
Q. How many telephone units can I connect on each FXS port of the
SPA2100?
A.
You can connect a few phones to the SPA2100's Line/FXS port, but the total ringer equivalency number
(REN) of the telephone should not exceeds three RENs per Line/FXS port. REN indicates how much load is
required for a phone to recognize a ring. Check your telephone documentation for REN specifications. You
may also locate REN on the underside label of the analog phone itself.
Related Information
• Technical Support &Documentation − Cisco Systems
Updated: Dec 12, 2008
Document ID: 108789