Wired Modem - LLM1100


Wired Modems – Leased-Line Modems

LLM1100 Bell 202/CCITT V.23 1200 Baud Modem


The LLM1100 modem’s technology is 30+ years old and the availability of components is approaching the end of life. Some phone lines no longer support this product. The DATA-LINC GROUP LLM100 is a Bell 202 modem that is available only for those who have an existing network and need a replacement modem or are adding to an existing LLM1100 network.

    • Long-range data communication via frequency shift key (FSK) simplex, half and full-duplex modem
    • Ideal for non-switched private wire (spare pair) or leased telephone lines or any dedicated wire pair
    • Two or four-wire operation

The LLM1100 is microprocessor-based, with a range of 20 miles (32 km) on any ordinary wire pair or unlimited on-loaded telephone company voice-grade (VG-6) leased lines or equivalent depending upon wire size and line quality.

Product Description

The Data-Linc Group LLM1100 is a Bell 202, 1200 baud modem. It can be easily configured for simplex (bit mode), half-duplex and full-duplex operations. The wired modem is designed to be used on private, leased non-switched telephone lines or any dedicated two-conductor wire (twisted or untwisted, shielded, or unshielded).

The LLM1100 is microprocessor-based— when the carrier shuts off, data bit errors are eliminated. This reduces retransmissions for trouble-free PLC communications. It also incorporates a unique data sense carrier control feature that eliminates the need for RTS/CTS control on multi-point Remotes.

The modem easily interfaces with most PLCs, RTUs, and PCs and also supports the RS232 interface.


Industrial Applications

Industrial Applications

The LLM1100 is ideal for systems that require:

  • Extended communications over private or leased telephone lines
  • Compatibility with Bell 202 or CCITT V.23 modems


LLM1100 Specifications

Up to 20 miles (32 km) on unloaded lines or
unlimited range on loaded lines

Serial Data Interface
RS232, 10 or 11-bit asynchronous
Throughput. 300, 600, 1200 Baud
Flow Control. RTS control or DSCC (Data Sense Carrier Control)
Serial Connector. DB9 female

Carrier Interface
Protocol. Bell 202, CCITT V.23 (Bell 202 default)
Carrier Connector. Removable Terminal Block

Operation Modes2
Point-to-point, point-to-multipoint
Simplex, half-duplex, and full-duplex (Full-duplex
requires four wires and point-to-point mode.)

Supply Voltage. 11 – 24 VDC; 12 VDC wall mount
transformer supplied with the modem.
. 60mA @ 12 VDC
Power Connector. Center Positive Barrel Jack or
Removable Terminal Block

Operating Environment
. 32° to 140°F (0° to +60°C)
Humidity. 0 to 95% non-condensing humidity

Standard. NEMA 1; 18-gauge steel;
1.54″ x 4.90″ x 7.75″ (3.9 x 12.4 x 19.7 cm) including mounting flanges

2 lbs (0.91k)

LLM1100 Bell 202/CCITT V.23 1200 Baud Enclosure Dimensions 

1 Loaded lines require TELCO VG-6 spec lines or equivalent. Line conditions, size, and noise will affect overall performance. Shielded wires should not be used. Line loss between any two devices in the network cannot be more than 17 dB.

2 To help with the proper application of the modems, please provide your Data-Linc Group sales representative with a detailed diagram of the proposed application.

Specifications are subject to change without notice.

P/N 155-09987-004