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.
Multimode, Multispeed Operation for Installed Base Compatibility
• Full-Duplex Operation Over a Single Dial Line, 2-wire and 4-wire private lines
• Simulated Half-Duplex operation
• Hayes® and CCITI V.25bis Auto-dialers
• Security operation
• MNP® Class 5 and CCITI V.42bis for Asynchronous Error Correction and Data
Compression
• Soft Setup Configuration
• CCITI V.54 Diagnostics
• Stand-Alone and Rack-Mount Configuration
• Optional Time/Day/Date-Controlled Dial Backup (RTC units)
Compatibility
CCITT V.32bis at 14.4K, 12.0K, 9600, 7200 and 4800 bps
CCITT V.33 at 14.4K and 12.0K bps CCITT V.32 at 9600 and 4800 bps
Bell 208 A/B at 4800 bps
CCITT V.22bis at 2400 bps
Bell 212A at 1200 bps
Bell 103 at 0-300 bps
Alternate Fallback Capability
CCITT V.22 at 1200 and 600 bps
CCITT V.21 at 0-300 bps
CCITT V.23 at 1200/75 bps
Data Rates
600-14.4K bps, asynchronous or synchronous
300, 1200/75, 19.2K and 38.4K bps, asynchronous only
Data Format
Asynchronous: 8,9, 10, or 11 bits, serial, binary
Synchronous: Serial, binary
Operation
Full-duplex over 2-wire dialup lines (0-19.2K bps), and over 2-or 4-wire leased lines (4800-19.2K bps)
Simulated half-duplex operation with CCITT V.13
Modulation
QAM at 14.4K, 12.0K, 9600, 7200 and 4800 bps echo cancel, full duplex (Trellis coded or non-coded at 9600 bps)
8 phase DPSK (Bell 208 mode)
QAM at 2400 bps band-split, full duplex;
DPSK at 1200 bps band--split, full duplex
FST< at 0-300 bps band-split, full duplex
Equalization
Automatic adaptive equalization
Selectable compromise equalization (4 types)
Interface
Terminal: RS-232(/D, CCITT V.24N.28
Telephone Line: Dialup - 8-pin modular jack with A/A1 & Ml/MIC
Leased - 6-pin modular jack
Line Requirement
Unconditioned
Transit Timing
Internal, External or Slaved
Transmit Level
Dial: Permissive (RJ11C) or
Programmable (RJ415/RJ45S)
Leased: 0 to -15 dBm selectable
Power Consumption
13 watts
Current Draw
.11 amps
Heat Generation
44 BTU/hr
FCC Compliance
Complies with FCC Part 15 Class A radio frequency radiation limits
FCC Part 68 Registration Number: ABE976-17652-MD-E
Ringer Equivalence: 0.8B
Environment
Ambient temperature: 0 to 50°C (32 to 122°F)
Storage temperature: -20 to 70°C ( -4 to 158°F)
Relative humidity: 10 to 95% at 24°( (75°F) noncondensing
Dimensions
Width: 9.7 inches (24.6 cm)
Height: 2.5 inches (6.35 cm)
Depth: 10.1 inches (25. 7 cm)
Weight
Stand Alone: 4 lbs. 2 oz. (1.87 kg.)
Rack Mount: 2 lbs. (.91 kg.)