Description
BLACK BOX MD845A-R2 Analog Async Bell 202 Modem – Leased-Line, AC power
The BLACK BOX MD845A-R2 202T modem is a Frequency Shift Keyed (FSK) modem which is designed for asynchronous operation at 0 to 1800 bps with good line conditioning, or 0 to 1200 bps asynchronous operation on unconditioned lines. The modem provides half duplex communications on 2 wire private lines or full duplex communications on 4 wire private lines, and is ideal for use in multipoint networks.
The 202 modem is a single printed circuit card enclosed in a new compact size housing. The unit features an integral anti-streaming protection option which prevents network Tie-ups by incorporating a delay timer that will disconnect a modem, if it remains in transmit mode longer than a selectable period of time. The 202 modem also features strap options for Request to-Send/Clear to Send Delay timing, Transmit Carrier, local Copy Squelch, Turnaround squelch, Soft Carrier Turn Off, Carrier Detect Level, Carrier Detect Delay, and Test Generator Baud Rate Select. These strap options allow the user greater control of the modem, for his individual application.
The BLACK BOX MD845A-R2 202T modem features built-in diagnostic and anti-streaming capabilities. The anti-streaming capability prevents a modem from remaining in the transmit mode when the modem is not actively transmitting data. The diagnostic features allow the user to verify transmitted and received data.
The modem is designed to be interchangeable between the Universal Data Shelf multiple modem enclosure (RM421A SERIES) and the stand alone modem enclosure. By removing the modem card and attaching the optional front panel, the modem can be directly inserted into the Universal Data Shelf. With this feature, a data-communications facility can be easily upgrade front multiple standalone enclosures to a centralized rack without the expense and trouble of purchasing new modems. Telenetics had to change some of the older chips for newer analog filters which gives new life to a world class modem. With these new changes we can offer an even a better unit – now with wider voltage choices and a temperature range.
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