Description
BLACK BOX MD833A-R7 Analog Sync/Async V.32 Modem – Dial-up or Leased-Line, AC Power
The BLACK BOX MD833A-R7 supports an automatic dial backup feature for leased-line applications. The BLACK BOX MD833A-R7 monitors the received carrier level and ljne quality and in the event performance drops below the selected threshold, will place a single dial call to the remote BLACK BOX MD833A-R7 via the PSTN. Automatic lookback allows communications to be returned to the leased line when conditions permit. Time-controlled dial backup is available as an option in units with an on-board real time clock (RTC).
HAYES® -COMPATIBLE & V.25 BIS AUTODIALERS
Automatic call origination is provided by the BLACK BOX MD833A-R7 via a Hayes compatible or CCITI V.25bis compliant auto-dialer. The Hayes® emulation mode allows the BLACK BOX MD833A-R7 to interface with a computer running intelligent communications software written to drive a Hayes® -style autodial modem. The CCITI V.25bis autodialer is compatible with asynchronous and synchronous serial call origination standards.
MNP® CLASS 5/CCITT V.42bis
The BLACK BOX MD833A-R7 supports MNP® (Microcom Networking Protocol) and CCITI V.42bis provides end-toend error correction and data compression between the BLACK BOX MD833A-R7 and another modem equipped with MNP® or V.42bis in the asynchronous operating mode. Error correction may be enabled in both dial and leased line operation.
SECURITY OPERATION
Security operation is available with the BLACK BOX MD833A-R7 to screen incoming calls. The BLACK BOX MD833A-R7 can be programmed to callback or pass-through the incoming caller after password validation. The BLACK BOX MD833A-R7 can also be programmed for transparent password protection in all operating modes by incorporation of the security password into the handshake process.
SOFT SETUP
The BLACK BOX MD833A-R7 provides soft setup for unit configuration. All Alliance modems incorporate a Liquid Crystal Display (LCD) and six front panel pushbuttons. Ths allows one method of unit configuration from the front panel, alleviating the need for internal switches. The options once selected are stored in nonvolatile memory (EEPROM). Another method of setup is provided through the diagnostic interface. A simple command language is utilized that allows local and remote configuration of the BLACK BOX MD833A-R7 over the diagnostic interface.
V.54 DIAGNOSTICS
Fully featured diagnostics are included for rapid problem isolation and downtime minimization. CCITT V.54 tests plus self-tests can qe initiated from the unit's front panel, DTE interface or diagnostic interface. The BLACK BOX MD833A-R7 supports Analog Loopback (Loop 3), Analog Loopback Self-test, Analog Loopback Self-test with Errors, Remote Digital Loopback (Loop 2), Remote Digital Loopback Self-test. In addition to diagnostic tests, the BLACK BOX MD833A-R7 provides numerous status displays the monitoring of the DTE interface and telephone line conditions. These status displays are available on the unit's front panel as well as remotely through the diagnostic interface.
VERSATILE CONFIGURATIONS
The BLACK BOX MD833A-R7 Modems are available in both stand-alone and rack-mount configurations. The units utilize a common base and are therefore interchangeable. For
RACK APPLICATIONS
117 VAC and -48 VDC applications, the rack provides mass termination connectors or optional single line breakout cards for the telephone line interface. Separate DTE interface connectors are provided as well on the rack's motherboard. Hot insertion is permitted and rapid swapping of rack-mount cards is accommodated, thus minimizing the time and cost of reconfigurations as installation and maintenance requirements dictate.
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