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Combination Extensions
You can connect a standard device (such as a standard phone or an answering
machine) on an extension by itself, or so that it shares an extension with another
piece of equipment (either another standard device or a system phone). An
extension with two devices connected to it is called a combination extension.
You cannot install two system phones on the same extension, and the combined
REN (Ringer Equivalence Number) of two devices on one extension cannot
exceed 2.0. (The REN for a system phone is 0.0.)
PARTNER-model phones have a built-in auxiliary jack so you can connect a
standard device directly to the phone without using a bridging adapter—see
“Using A Direct Connection” below. If your system phone does not have a
built-in auxiliary jack or if you want to connect two standard devices together,
you must use an AT&T 267F2 Bridging Adapter—see “Using a Bridging
Adapter” below.
NOTE:
A Music On Hold device cannot share an extension with a phone.
Using a Direct Connection
Figure C-4 shows how to connect a standard device directly to a system phone,
using the phone’s built-in auxiliary jack.
Plug line into
jack labeled LINE
Plug auxiliary device
into jack labeled
AUX
Figure C-4. Combination Extension Using Direct Connection
Using a Bridging Adapter
Figure C-5 shows how to connect a system phone and a standard device or two
standard devices together using the AT&T 267F2 Bridging Adapter.
AT&T
267F2
Adapter
Standard Device Only
System Phone or Standard Device
Wall Jack
Figure C-5. Combination Extension Using Bridging Adapter
✽
REN is a measure of the power it takes to ring a phone. A typical home phone line can handle 4.0-5.0 RENs;
each extension jack in your system can handle 2.0 RENs.
Installation C-7