ZyXEL Communications U-336R/RE manual EDR Application Example, Special Functions

EDR detection (either CNG or DTMF tones) will be disabled once detection occurs. However, a customer’s program might not answer because the setting of the software may require multiple rings to answer. S51 bits 0-1 control the number of rings that the modem will report once the CNG or DTMF tone is detected.

The timing relationship between the Caller ID (if enabled), EDR, and ring detection is as follows:

ring1	ring2			ring3
***--------	***--------		***	------------------------------
	3sec	3s	3s	3s	S7 time-out
+------	+---+------	+	---+------		+---+-------------	+----
CID/EDR RD		EDR		RD	EDR RD	EDR	RD
CID=Caller ID task RD=Ring Detection task							EDR=EDR task

ONOTE: DURING THE EDR PERIOD, ANY AT COMMAND WILL DISABLE THE EDR FUNCTION.

EDR Application Example

If we use ZFAX as our fax receiving application and we don’t want it to answer the call unless it is a fax call, the way to set it up would be:

1.Set ZFAX to answer on 2 rings.

2.Set S51.0=1 to enable EDR and report RING twice. The modem will not report a normal RING and ZFAX will not answer a call unless EDR RING is reported.

3.Set S51.4=1 to enable fax CNG tone detection. It is reported as RING.

50 Special Functions