Products  >  Model 1003 View Printable

This legacy product is EOL. For more information, please contact support for a suitable alternative:

The Model 1003 Async., 2-Wire, Carrier Sense Short Range Modem combines the 2-wire capabilities of the Model 1002 with the carrier sense capabilities of the Model 1005. The result is a versatile short haul that allows RS-232 UNIX systems (and similar systems that require carrier sense handshaking) to communicate over coax or a single twisted pair.

The Model 1003 is particularly applicable to environments where coax cable is already installed, or where there is a desire to double the carrying capacity of existing twisted pair lines. Besides its usefulness in UNIX environments (where the host must see carrier to send a logon screen to a terminal), the Model 1003 is also tailored for troubleshooting in systems where the presence or absence of carrier indicates positive or negative line integrity.

The Model 1003S incorporates 600 Watts per wire of Silicon Avalanche Diode surge protection on the line side.

Coax (BNC) Connections Available for All 2-Wire Modems



Patton's Carrier Sense short range modems incorporate a special handshaking feature that allows them to sense the presence of a carrier signal on the line. This Carrier Sense feature enables the Model 1003, 1005 and 1006 to perform specialty functions not possible with data only SRMs. For example; in UNIX operating environments, the host often needs to see that a terminal is ON before it will send a logon screen. The Model 1003 automatically senses carrier on the line when a terminal is ON, thus fulfilling this requirement.

  • Carrier Sense Handshaking
  • Operates Over Coax or a Single Twisted Pair
  • Ideal for UNIX Operating Systems
  • Range over 5 Miles (8km)
  • Data Rates to 19,200 bps
  • No AC Power or Batteries Needed
  • External DCE/DTE Switch
  • Available with BNC, RJ-11, RJ-45 or Terminal Block 2-Wire Interface
  • 600 Watts Per Wire of Silicon Avalanche Diode Surge protection (Model 1003S)


Ordering information for this product is not publicly available at this time.
Please accept our apology as we regret any inconvenience to you.

For more information
about the availability of this product and/or alternative solutions,
please contact Patton's Product Management team at or +1 301 975 1000

Sales: / +1 301 975 1000
Support: / +1 301 975 1007
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