Black Box Modem 202 User Manual

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© 2007. All rights reserved. Black Box Corporation.  
Modem 202 and Modem 202T  
Reliable old favorites, manufactured  
to today’s exacting specifications.  
 
generate a data pattern from the locally attached DTE or have  
the modem generate a test pattern.  
TECH SPECS  
MD845A-R2:  
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.  
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  
1
Mounting — Hole pattern 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  
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).  
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  
MD845A-R2  
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.  
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;  
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.  
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:  
Item  
Code  
Modem  
Modem 202 (without Diagnostics)  
Modem 202T Standalone (with Diagnostics)  
Standalone  
MD845A-R2  
RJ-45 to 4-wire leased-line cable  
User‘s manual  
AC  
DC  
MD1970A  
MD1970A-DC  
MD1970C  
MD1970C:  
202T Modem Rackmount Card  
User‘s manual  
Rackmount Card  
You may also need…  
DB9 Extension Cable  
DB9 Male to DB25 Female Adapter  
EDN12H-0010-MF  
FA521A-R3  
8/22/2007  
#16407  
724-746-5500  
blackbox.com  
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