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18
C H A P T E R T W O
Multi-Line Connections (PABXs)
Most offices use a central telephone system, or PABX. The machine will
work with most PABX or key systems that allow a two-wire analogue
connection. However, we recommend that you have a separate telephone
line for your machine. You can then leave the machine in Fax Only Mode
to receive faxes any time of day or night.
If you are installing the machine 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.
2
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.
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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