Tech Specs, WHAT‘S Included | Black Box 202T specs

MD845A-R2

generate a data pattern from the locally attached DTE or have the modem generate a test pattern.

You can also run line and modem tests to verify the integrity of the line between the local and remote modems. With this test, the local Modem 202T loops back received data to the transmitter and sends the data to the remote modem. These characters can be done by using a modem test pattern or by originating a data pattern from the local DTE.

Configuration is simple!

To configure the Modem 202T, just set a few DIP switches. These jumper settings control operating characteristics such

as the dynamic range of the modem receiver, the transmit level, and the call turnaround squelch (which guards against echoes from already-completed transmissions).

By default, the Modem 202T’s DIP switches are set for 4-wire, full duplex operation. To reconfigure the modem for 2-wire, half- duplex applications, just change the jumper settings.

When configured for 4-wire, full duplex operation, the modem can be strapped to transmit data to corresponding slave modems with no RTS to Carrier Turnoff Signal (CTS) delay, which is ideal for minimizing turnaround. To increase the modem’s turnaround time, just configure it for 2-wire, half-duplex operation. This will enable the modem to encounter an RTS-to- CTS delay when transmitting to its slave modems.

On the inside of the Modem 202T is a simple three-position header for full or half-duplex mode. The device’s DCE interface quickly connects to any device equipped with a standard DB9 or DB25 connector.

Troubleshooting’s easy, too.

An LED control display enables you to confirm modem operation at a glance, and a local and remote test switch enables verification of the link’s integrity.

Along with the Modem 202 or Modem 202T, you’ll receive a cable for making RJ-45 to 4-wire leased-line connections. But to connect a data terminal, you’ll need an RS-232 cable.

TECH SPECS

MD845A-R2:

Distance (Maximum) — 20 mi. (32.2 km) on unloaded lines, depending upon line characteristics

Enclosure — Standard NEMA 1; 18-gauge steel with mounting flanges Handshake Modes — DataSense (DSCC) or RTS line

Mounting — Hole pattern 1⁄4" (0.6-cm) diameter located on rectangle 8.3" x 2.8" (21.1 x 7.1 cm)

Operating Frequency — 1200/2200 Hz (Bell 202 or 1300/2100 ITU V.35) FSK (Frequency Shift Key)

Operation — 2-wire, half-duplex or 4-wire, full duplex Protocol — Asynchronous

Speed — 300, 600, or 1200 baud half- or full duplex up to 1200 baud simplex

Connectors — (2) terminal blocks, (1) DB9 F

Indicators — (4) LEDs: Data Out, Data In, Carrier, Power Temperature Tolerance — -4 to +158°F (-20 to +70°C) Power — Input: 11 to 18 volts DC at a minimum of 200 mA;

External wallmount power supply provided for 110 VAC nominal Size — 1.5"H x 5"W x 9"D (3.8 x 12.7 x 22.9 cm) over mounting flanges

MD1970A and MD1970A-DC:

Carrier Detect Delay — 6 or 23 ms OFF-to-ON, 6 ON-to-OFF Carrier Frequencies — Mark: 1200 Hz ± 1%;

Space: 2200 Hz ± 1%

Diagnostics — Self-test, analog loopback, digital loopback, test pattern transmit

Line Impedance — 600 ohms ± 10% transformer coupled and transient protected

Modulation — Phase coherent; frequency shift keyed (FSK) Operation — 2-wire, half-duplex or 4-wire, full duplex Protocol — Asynchronous

RTS to CTS Delay — 8, 33, 59, or 219 ms

Speed (Maximum) — Unconditioned line: 1200 bps; Conditioned line: 1800 bps

Transmitter Output Level — Selectable from 0 to -14 dBm in 2-dB steps Turnaround Squelch — 8 ms or 159 ms

Connectors — (1) DB25 female (DTE); (1) RJ-45 (telco) Indicators — (7) LEDs: RS, CS, CD, RD, TD, TM, Power Temperature Tolerance — -40 to +185°F (-40 to +85ºC) Humidity Tolerance — Up to 95%, noncondensing Power — MD1970A: 115 VAC, 60 Hz;

MD1970A-DC: 12 to 60 VDC

Size — 2.3"H x 7"W x 9.6"D (5.8 x 17.8 x 24.4 cm)

WHAT‘S INCLUDED

MD845A-R2, MD1970A, MD1970A-DC:

✦Modem

✦RJ-45 to 4-wire leased-line cable

✦User‘s manual

MD1970C:

✦202T Modem Rackmount Card