GDC DeskTop 202 1800 bps
Private Line Modem



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DataComm 202T 1200/1800 bps Private Line Modem

  
Product Highlights:

•  Bell 202T and CCITT V.23 compatible for end-to-end network integrity

•  DataCommonality provides high packaging density

•  Built-in diagnostics and easy status monitoring mean rapid fault isolation and system restoral

•  Microprocessor and VLSI design for higher performance and reliability

Description

The DataComm 202T is a VLSI-based, high performance data set offering full or half duplex, 1200/1800 bps asynchronous operation over voice grade circuits. It is fully compatible with Bell 202T data sets, which means it fits perfectly into existing network schemes without disturbing network integrity. Since the unit also complies with the CCITT V.23 recommendation, it can satisfy a wide range of domestic and international private line applications.

In addition to special Bell 202T features, the DataComm 202T offers all the advantages of GDC's unique, high density packaging concept, DataCommonality. Up to 16 DataComm 202Ts can be easily rackmounted in a standard 19-inch shelf, saving valuable computer room space. The same data set can also be installed in a standalone enclosure, reducing the number of spares you need to keep in inventory. All units are highly power efficient and easy to install and maintain.

Special Bell Features

Designed as a Bell 202T compatible modem, the DataComm 202T incorporates the following special carrier detect and receiver control features:

•  Carrier detected only in the 1000 to 2400 Hz band to ensure valid carrier

•  Receiver squelch timing switch is selectable for 9 or 156 ms

•  Optional soft transmit carrier turnoff eliminates problems of abrupt carrier turnoff and resulting erroneous data

•  Optional quick receive carrier turnoff

•  Carrier Detect (CD) ON prevents Clear To SenD(CTS) ON

Easy Operation

The DataComm 202T's front panel design makes it simple to operate and maintain. Easy-to-read status indicators and built-in pushbutton diagnostic controls enable immediate fault isolation and rapid system restoral. In keeping with our total systems approach to communications, the DataComm 202T is compatible with GDC's DeskTop 202 data sets.

Reliable Data

The DataComm 202T employs a user selectable compromise equalizer to control the transmit line signal. This powerful, error control feature gives you greater immunity to the line impairments normally present in unconditioned voice-grade communications. With the DataComm 202T, you can expect reliable data throughput in a cost-effective, convenient package.

Specifications

 

 

DATA RATES

 

0-1200 bps, unconditioned

0-1800 bps, C2 conditioned
 

OPERATING MODE

 

Half or full duplex; 2- or 4-wire private line
 

OPERATING FORMAT

 

Asynchronous, binary, serial
 

LINE REQUIREMENTS

 

Voice grade, private lines or C2 conditioned
 

LINE IMPEDANCE

 

600 or 900 ohms, balanced
MODULATION  

Frequency Shift Keying (FSK) Mark, 1200 Hz; Space 2200 Hz; Soft Carrier, 900 Hz
 

CARRIER FREQUENCY

 

1200 Hz and 2200 Hz ±1%
 

TRANSMITTER

 

Output Level:  0 dBm, switch selectable to -15 dBm in 1 dB steps

Equalization:  Compromise, selectable

RTS/CTS Delay:  0, 8, 30, 60, 180 ms, switch selectable
 

RECEIVER

Receiver Operating Range:  0 to -36 dBm

Carrier Detect Threshold Acquisition:  Assured with a receive level at or above -30 dBm

Carrier DetectThreshold Release:  Assured with a receive level at or below -36 dBm

Receiver Squelch:  0, 9, 156 ms after RTS off

Soft Transmit CarrierTurnoff:  0, 8, or 24 ms

Quick Receive CarrierTurnoff:  Less than 1 ms

Hysteresis:  2 dB minimum
BUSINESS MACHINE INTERFACE  

EIA-232-D
 

POWER REQUIREMENTS

 

117 VAC, 57-63 Hz, 10 watts maximum
 

PHYSICAL CHARACTERISTICS

Standalone

Height:  100 mm (3.9 in.)

Width:  275 mm (10.9 in.)

Depth:  319 mm (12.0 in.)

Weight:  2.8 kg (6 lbs.)

Shipping Weight:  3.2 kg (7 lbs.)

Temperature:  0° to 50° C (32° to 122° F) operating  

-40° to 70° C (-40° to 158° F) non-operating

Humidity:  Up to 95% without condensation

Rackmount (Full shelf with 16 modems)

Height:  265 mm (10.5 in.)

Width:  483 mm (19.0 in.)

Depth:  343 mm (13.5 in.)

Weight:  18 kg (40.25 lbs.)

Shipping Weight:  19 kg (42 lbs.)

Temperature:  0° to 70° C (32° to 158° F) operating 

 -40° to 85° C (-40° to 185° F) non-operating

Humidity:  Up to 95% without condensation
SAFETY PROTECTION  

UL listed and CSA approved
 

INTERFERENCE PROTECTION

 

Verified to comply with FCC Part 15, Class A requirements

 


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