Modem 34336

2.4.8V.29 FAST MASTER AND SLAVE MODES (QUICK SETUPS 14 AND 15)

In multidrop operation, the master modem transmits to all of the slave (remote) modems. When the DTE at a slave site recognizes its own address in the polling protocol, it raises RTS to the slave transmitter. The slave responds by transmitting a special training sequence, then raising CTS and transmitting the data from the DTE. When the DTE has completed transmission, it lowers RTS and the modem will drop carrier to let the next modem on the poll list use the channel.

The V.29 Fast Master and Fast Slave modes support data rates of 4800, 7200, and 9600 bps. The leased lines can be conditioned or unconditioned. The master modem must be set to originate mode, and the slave modem must be set to answer the mode. (The Answer/Originate option is automatically set to these settings when the V.29 Fast Master and Fast Slave Quick Setups are used.)

Slave-to-Master (Inbound) Transmission

When the remote modems come on-line, they automatically synchronize to the incoming carrier and train on the data stream from the master modem. Slave-to-master transmission is always switched carrier operation under control of the RTS signal from the DTE. An anti-streaming timer built into the modem will (if enabled) halt transmission if the DTE holds RTS on for more than 30 seconds. The assumption is that if RTS is held on for more than 30 seconds, there is a fault in the DTE.

If you access the TIA/EIA status screen on the LCD display when a slave modem is transmitting to the master modem, the status screen will typically look like this:

TR MR RS CS TD

9600

CD RD

Typically TD, CD, and RD will flash on the master modem, and RS, CS, TD, and RD will flash on the slave modems.

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Black Box MD885C-R2, MD885AE-R2, MD885A-R3, 34336 user manual Slave-to-Master Inbound Transmission

MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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