Telephone Answering Device (Tad) Interface - OKIDATA OF1000 Service Manual

4.11 TELEPHONE ANSWERING DEVICE (TAD) INTERFACE

4.11.01 General Information
The Telephone Answering Device (TAD) Interface allows Okifax units to share the same phone
line with a telephone answering device. The Okifax unit and answering device work together to
process incoming voice and fax calls, each to their own function. For the TAD Interface to function
properly, the following User Functions must be set:
1. TAD Mode (Technical Function #45) must be enabled. The default setting is OFF.
2. Ring Response Time (User Function #24)(User Function #25 when optional High Capacity
Cassette is installed) should be set to "1" ring. This is the default setting.
3. Tel/Fax Timer (User Function #10) should be set to 35 seconds. This is the default setting.
To properly connect the Okifax unit to an answering device and phone line, the physical hook-up
must be as follows:
1. The line cord from the RJ11C jack should be connected to the jack marked "Line" on
the Okifax unit.
2. The answering device must have its line cord connected to the jack marked "Tel" on
the Okifax unit.
NOTE:
A single line telephone may then be connected to the jack marked "TEL" or "PHONE" on
the answering device, although this is optional.
Once the physical connections have been established and the function settings programmed, the
TAD Interface functions as follows:
1. When an incoming call is received, the Okifax will monitor the line for 35 seconds (Tel/Fax
Timer setting determines this period). The timing period begins when the first incoming ring is
detected. During this time, the Okifax unit listens for two things, and acts on them as follows:
(a) CNG (Calling tone) from a remote fax unit. This 1100 Hz tone is sent by most facsimile
units that dial automatically. The Okifax unit will seize the line from the answering device
and begin automatic reception if the CNG tone is detected.
(b) The Okifax unit waits for the answering device to disconnect the line. Once the Okifax
unit senses that the answering device has dropped the line, it begins automatic
reception.
EXPLANATION:
Normally, the answering device will answer an incoming call and play its announcement. When
the answering device disconnects the line, the Okifax unit will seize the line and attempt automatic
Service Guide OF1000
Chapter 4 Failure & Repair Analysis
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