V.23 2-wire or 4-wire Asynchronous Private Line Modem

  • Full duplex to 1200 bps
  • Asynchronous RS-232/V.24
  • 4-wire, full duplex private line
  • 2-wire, half duplex private line
  • 900 Hz soft carrier turn off
  • Anti-streaming
  • Standalone or rack mount
  • PC card rack model (PC supplies power and ground only)
  • High stability transmit and receive frequency
  • Ruggedized for full temperature range -40 to +75C
  • Quiet multi-layer board
  • Fully compatible with other asynchronous V.23 modems
  • 120, 220 VAC, 12, 24, and -48VDC options


Physical and Electrical
Download a copy of the manual.


Looking for a 4-wire only modem that covers both synchronous and asynchronous?
Check out our V.23 sync/async 4-wire model.
Click here.



The V.23 modem operates at 0 to1200 bps asynchronous, with FSK modulation, 2-wire or 4-wire over non-switched dedicated lines. It uses the latest DSP modem circuitry to insure excellent performance and future availability. It has 900 hz soft carrier turn off for multidrop and an anti-streaming option.

The V.23 modem is avaiable in 7.25” half card size, standalone and custom OEM board configurations are available. The pc card uses the internal PC ISA bus only for power from the pc bus. The PC card fits into a 20 slot rack mount chassis that is only 7” high. The phone line connector is an RJ-11 for 4-wire leased line operation. Transmit is on positions 2 and 3, receive 1 and 4 of the 4 position RJ-11connector. The modem has a push/push switch for local digital loop on or off. The loopback switch is located on the rear of the unit, next to the DB-25 terminal connector.

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

Modem Digital Interface
Controls and Indicators
Physical and Electrical
Switch                        DOWN                        UP
1 - Reset			OFF			Toggle Up/Down
2 - Anti-streaming		OFF			On        
3 - Phase Equalizer		ON			OFF
4 - RTS Control			Forced ON		RTS Controlled         
5 - Soft Carrier		Turnoff disabled	Enabled   
6 - Line type			4-wire			2-wire
7 - Transmit Level		-16 dBm			0 dBm
8 - Loopback			Loop ON			Loop OFF


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

Need it fast?  Buy on-line or call toll free 800-432-2638!

Item Number Description Price Buy Now!
V23-Async-SA V.23 Asynchronous Modem - Standalone w/ 110VAC wall mount supply $ 555 Qty:
V23-Async-12VDC V.23 Asynchronous Modem - Standalone w/9-18 VDC internal power supply $ 630 Qty:
V23-Async-24VDC V.23 Asynchronous Modem - Standalone w/18-36 VDC internal power supply $ 630 Qty:
V23-Async-48VDC V.23 Asynchronous Modem - Standalone w/36-72 VDC internal power supply $ 630 Qty:
V23-125VDC 125 VDC external power supply for use with V23-Async-SA $ 125 Qty:
V23-Async-R V.23 Asynchronous Modem - Rackmount $ 445 Qty:
DCBL1 20 Slot Rack w/ power supply $ 1680 Qty:
9902096 19" Rack Bezel 1 unit wide $ 30 Qty:
9902095 19" Rack Shelf 3 units wide $ 75 Qty:

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