Manuals / Black Box / Computer Equipment / Modem

Black Box MD885AE-R2, MD885C-R2, MD885A-R3 Compromise Equalizers option is available for all modes

Models: MD885C-R2 MD885A-R3 MD885AE-R2 34336

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3.0 Modem Setup Options

The Compromise Equalizers option is available for all modes.

NOTE

The compromise equalizers affect only V.32 operation (4800 to 14,400 bps, asynchronous/synchronous, full duplex).

For most applications, the automatic adaptive equalizer setting provides all the equalization necessary to compensate for line impairments, meaning that equalizer adjustments are generally not necessary. However, in the event that equalizer adjustment is needed, any of four types of compromise equalization can be selected: Type I (T-I on the LCD), Type II (T-II), Type III (T-III) and Type IV (T-IV). The equalizer can also be turned OFF.

Where line conditions are atypical, it may be necessary to adjust the equalizers to optimize the signal quality. If adjustment is necessary, refer to the quality screen for guidance; this screen shows a relative indication of the signal quality, in both numeric and graphic form.

The Trellis Code option is available for all modes. Trellis coding provides performance advantages for all modulation patterns. The modem’s CCITT compliant trellis coder is normally enabled at speeds of 9600 bps and above, but may be negotiated off by a modem that is not equipped with a trellis coder. The trellis code option allows you to enable or disable the trellis coder.

The Transmitter Clocking option is available for all modes. It selects one of three possible sources for the transmitter timing signal:

•INTERNAL — The timing of the modem and data terminal transmitting circuits is provided by an internal clock within the modem.

•RECEIVED (RX-CLK) — The timing of the received data is used to control the timing of the data transmitted. This timing mode is used if the modem’s transmit timing must be controlled by a remote source.

•EXTERNAL — The timing of the modem and data terminal transmitting circuits is provided by an external clock within the data terminal and is provided to the modem via the DTE connector pin 24. This mode of clocking is used if the DTE must be in control of the modem’s transmit timing.

The T1 Timer option is available for Hayes, V.25 bis, and Dumb modes. It determines how long the Modem attempts to handshake with a calling V.32 modem before falling back to a lower speed. The available T1 Timer settings are 0, 0.3, 0.8, 1.6 and 3.0 seconds.

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Black Box MD885AE-R2, MD885C-R2, MD885A-R3, 34336 user manual Compromise Equalizers option is available for all modes
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MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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