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18
C H A P T E R T W O
If you are installing the MFC to work with a PABX:
1
It is not guaranteed that the unit will operate correctly under all
circumstances with a PABX. Any cases of difficulty should be
reported first to the company that handles your PABX.
If all incoming calls will be answered by a switchboard operator, it is
recommended that the Answer Mode be set to Manual. All incoming
calls should initially be regarded as telephone calls.
3
The unit may be used with either pulse or tone dialling telephone
service.
Ringer Equivalence Number (REN)
This equipment has a REN value of 1. A BT line has a "bell ringing"
capacity, or REN, of 4. This means that adding downstream-connected
extension telephones and/or extension bells to a total REN of greater
than 4 may cause a reduction in the bell volume. In extreme cases, it
may cause the auto-answer facility of the machine to fail.
Therefore, up to three additional extension telephones (each assuming a
REN of 1), may be connected downstream of your machine. For an
explanation of "downstream connection", read "Using extension
telephones" which follows.
Unless otherwise marked, a telephone provided by BT may be assumed
to have a REN value of 1.
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