Modem 34336

•H — Telephone Switch Hook. The H command (on-hook) is used to terminate a call. (On-hook corresponds to off-line.) H may also alternate between voice and data transmission during the same call (if your communication software supports this capability).

The H1 command (off-hook) activates the telephone line relay, causing a dial tone to be sent after a 2-second delay. For most purposes the command is not necessary, since the switch hook is automatically activated when the Modem originates or answers a call.

•L — Link. The L dial modifier is used to link one phone number to another. One number can be an alternate number to be dialed if a connection is not made to the primary number. The L parameter must be used after a phone number, and before a carriage return or period. A number is used after L to specify the memory address (0-9) containing the number to be linked to the first number. See the command below.

AT D 555-1212 L5

NOTE

L may also be used in V.25 bis mode with the CRN command (instead of AT D), in both Dumb mode and 208 operation. In Dumb mode or 208 operation, L is stored via the PHONE screen. In all cases, L is used in the same way and has the same function as described above (except that AT D is not used).

Two or more addresses may be linked in a cyclic fashion to alternate dialing until a connection is established:

Contents of cell 0: 555-1212 L1

Contents of cell 1: 444-1234 L2

Contents of cell 2: 888-5555 L0

With the cells loaded as shown above, if the command AT DS=0 is issued, the autodialer goes to cell 0 and dials the number stored there. If unable to connect, the L1 command stored in cell 0 directs the autodialer to dial the number in cell 1. The L2 stored in cell 1 directs the autodialer to cell 2 (assuming a connection cannot be made), and the L0 command stored in cell 2 directs the autodialer back to cell 0. The numbers are dialed in a loop until a connection is established or until 10 calls are attempted.

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Black Box 34336, MD885AE-R2, MD885C-R2, MD885A-R3 user manual AT D 555-1212 L5
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MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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