Black Box MD1640A, MD1641A manual Flash On Hook, Calling Card Detect Tones $, Quiet Answer @

CHAPTER 5: Command Mode

Flash On Hook !

Some switchboard systems react to a momentary On Hook. An exclamation mark inserted in the command causes the modem to “flash” on hook for a half of a second, as if you had held the switch hook button on a telephone down for a half second.

For example, to flash On Hook after dialing the number 555-1234 in order to transfer to Extension #5678, you might enter ATDT5551234,,!5678. The commas cause a 4 second pause (just to be safe).

"Calling Card" Detect Tones $

The Series II Modem has the capability to detect AT&T "calling card" tones for the purpose of utilizing the user's calling card number to originate an on-line connection. An $ symbol placed in the dialing string causes the modem to pause and wait for an AT&T "calling card" or a 1600 Hz tone (prevalent in the United Kingdom). When the tone is detected, the rest of the dialing string is processed. If no tones are detected within the time period set by S-Register S7 (default 45 seconds), the modem will abort by indicating a NO CARRIER message. Hitting any key also aborts the $ command.

The following is an example of this command:

ATDT101099907247465500$0123 4567 8910 1112

Quiet Answer @

The @ command causes the Series II Modem to wait before processing the next symbol in the dialing string. The wait is for one or more ringbacks followed by 5 seconds of silence. If the time specified by S-Register S7 passes before the rings and silence, a NO ANSWER (R) result code is processed. The @ command is used for accessing a system that does not provide a dial tone.

For example, ATDT5551212@7465500 causes the Series II Modem to dial the first number (555-1212) and wait for the time specified in S7

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