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ASD-4
4.1 Before You Operate
4.1.1 S
T
ERVICES
HAT
Before you operate the ASD-4, please be aware that certain services offered by
the phone company do not work well with, or aren't compatible at all with,
the ASD-4:
• Call Waiting: Transmissions involving an older fax machine or modem
could be disrupted by Call Waiting's "beep" tone. The only effect this
tone has on newer fax machines is to make them insert a thin line into
faxes. The tone will probably have no noticeable effect on newer modems.
• Call Forwarding: If Call Forwarding is enabled for a line, the ASD-4
cannot process calls on that line.
• Phone-Company Voice Mail: The phone company's voice-mail service is
not compatible with the ASD-4. Standalone (on-site) voice-mail systems,
however, usually work well with the the ASD-4.
We recommend that you stop subscribing to Call Forwarding and the phone
company's voice mail. Call Waiting might not give you trouble, but test it with
your fax and modem to make sure.
4.1.2 U
NDERSTANDING
Your ASD-4 depends on audible "beeps" called CNG (CalliNG) tones, sent by
most fax machines, to route calls. Once a sending fax machine has dialed the
receiving fax machine's number, it generates these tones while waiting for the
receiving fax to answer. (Note that CNG signals are distinct tones transmitted
at three-second intervals, not the steady tone you hear at your end during a
fax transmission.) When the ASD-4 answers an incoming call, it "listens" for a
CNG signal to determine whether a fax machine is calling. If it detects a CNG
tone, the ASD-4 automatically transfers the call to its FAX port without ringing
the phone on your TAD or PHONE port. If it doesn't detect a CNG tone, it
transfers the call to its TAD and PHONE ports.
22
4. Operation
W
'
W
ON
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CNG T
AX
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