V.23 4-Wire Private Line Analog Synchronous/Asynchronous Modem

Full duplex to 1200 bps Asynchronous or synchronous RS-232/V.24 4-wire, full duplex line application Standalone or rack mount High stability transmit and receive frequency Ruggedized for full temperature range Quiet multi-layer board Fully compatible with other V.23 modems

FEATURES

• Full duplex to 1200 bps
• Asynchronous or synchronous RS-232/V.24
• 4-wire, full duplex line application
• Standalone or rack mount
• High stability transmit and receive frequency
• Ruggedized for full temperature range
• Quiet multi-layer board
• Fully compatible with other V.23 modems

DESCRIPTION

The modem has a push/push switch for local digital loop on or off. The DIP switch is located on the PC card and is accessible behind the front panel of the standalone modem. The loopback switch is located on the rear of the unit, next to the DB-25 terminal connector.

This modem is compatible with other V.23 modems, and features high stability transmit and receive frequency circuitry, and a large dynamic range.

SPECIFICATIONS

General

• Analog full duplex, 4-wire, 600 ohm balanced
• Frequency Shift Keying:
  Mark-1300 hertz at 600 & 1200 bps, Space-1700 hertz at 600 bps, 2100 hertz at 1200 bps
• Transmit and Receive clock supplied by modem, Modem supplies transmit clock and recovered received clock, allowing the modem to run sync or async without a switch
• Transmit level control from +3 dBm to -30 dBm, (+3, 0 -16 and -30)
• The modem operates with no errors when signal interruptions occur at less than ¼ of a bit length (300 microseconds) at the selected bit rate
• Operates with no errors when the signal level changes up to 25 dBm
• Will drive up to 30 Km of cable depending upon wire gauge
• Switched carrier or constant carrier operation (RTS forced on or terminal controlled)
• V.23 modems will communicate with military l1TADILB modems configured in V.23 mode, however they will not interoperate if the L1TADILB modem is in Link 1 mode

• RS-232/V.24, DB-25S
• Signals are Tx, Rx, RTS, CTS, DSR, DCD,TxClock, RxClock, Ext TxClock
• RTS/CTS delay is 4 or 8 ms in switched carrier mode or RTS can be forced on
• Rx data is clamped to mark when no receive carrier detect is present.
• Rx clock continues to run when carrier detect is off

Controls and Indicators

• Power, Tx Data, Rx Data, RTS, CTS, DCD, Test
• Digital loop via rear panel switch and front DIP switch
• Controlled carrier (with RTS/CTS delay) or constant carrier with RTS/CTS on
• Rts/CTS delay of 4 or 8 ms
• Loopback or normal operation
• Internal timing or external transmit timing
• Synchronous speeds of 600 or 1200 bps
• Transmit levels + 3 dbm, 0 dbm, -16dbm, or -30 dbm

Physical and Electrical

• -40C to +70C operating temperature range, PC ISA bus format or standalone version,
• PC bus for power and ground only, standard standalone unit uses 120V wall mount supply
• Half size PC ISA card, 7.25"D x 4.25"H
• Stand alone: 5.5" W x 7.375"D x 1.5" high, 120VAC wall mount supply (9VDC, 500 ma)
• Other DC power supply voltages, 12, 24, -48, 125 VDC, available on special order
• A 1.5" x 19" fixture is available to rackmount up to 3 standalones in a single 1U height
• 20 slot rack chassis on slide guides is 19"W x 16"D x 7"H, 110VAC 250 W power supply

Switches

OPTION SWITCH SETTINGS 
Switch                        DOWN                        UP
1 - N/A
2 - Speed                1200                        6s00        
3 - RTS/CTS delay        4 ms                        8 ms
4 - Carroer                Constant                RTS Controlled         
5 - Clocking                Internal                External Pin 24 input        
6 - Transmit Level        See table
7 - Transmit Level        See table
8 - Digital Loop           Loop On                        Loop Off

    

APPLICATION

20 slot rack chassis - 19"W x 16"D x 7"H	Standalone rack fixture - 18.95" x 1.75" high Single, Triple Unit Rack Mounts

How to Order

Data Comm for Business Inc. 2949 County Road 1000 E Dewey, Il 61840	Voice: 217-897-6600 Toll Free: 800-4-DCB-NET Toll Free: 800-432-2638	Email: Contact Page Web: www.dcbnet.com Fax: 217-897-8023
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