11 bit Async code Modem

11 bit code - with 8 data bits
DC powered Synchronous / Sync and Asynchronous / Async Modem

9600 bps V.29 Synchronous and Asynchronous Modem

  • 9600 bps, also operates at 4800 and 7200 bps, V.29
  • RS-232 interface
  • 11 bit code
  • Synchronous or asynchronous
  • Point-to-Point, 4-wire unconditioned leased line operation
  • LCD display
  • Network management port
  • Optional 12/24/-48VDC or 120/240 VAC power supplies

The DCB LL9.6 modem is a full featured V.29 leased line modem. The LL 9.6 modem operates over 4-wire unconditioned leased lines at 9600 bps synchronous or asynchronous. It is an excellent choice for point-to-point leased line applications.

The LCD front panel is used to set up the following parameters for the local modem: Modem rate, modem address, RTS/CTS delay, RTS Holdover, RTS Stream, RTS Control, Transmit Carrier, Transmit Clock Source, Synchronous or Asynchronous, Receive Level, Transmit Level, Transmit Data Clamp.

The modem can send remote commands for loopbacks, test tones and to measure remote receive levels. In addition, the LCD front panel can initiate the following diagnostic tests: Line test, Digital Loopback, Analog Loopback, Remote Digital Loopback, Send 1004 Hz test tone, Remote send 1004 Hz test tone.

The LCD front panel is continuously updated to display the receive level in dBm. This is most useful when diagnosing line troubles with the telephone company.

The Network Management port is accessed through a 9-pin RS-232D asynchronous port on the rear of rear panel of the modem. Through this port it is possible to configure the modem and perform all the test diagnostics available through the LCD front panel. The Network Management port can also be used to configure the remote modem and measure the remote receive level.


Indicators (front panel)
Power, Transmit Data, Receive Data, Request to Send, Clear to Send, Data Carrier Detect, LCD front panel display
Front panel push buttons for Next,->, INCR, OK, RESET
Interface: Four wire lease line
Connector: RJ11-C
Data Port
Interface: RS-232-D, V.24
Connector: DB25 female
Timing: Synchronous or Asynchronous
Network Management
Interface: RS-232-D, V.24
Connector: DE-9 female
Timing: Asynchronous
Front Panel and Network Management Port Commands
Rate, Sync/async, receive and transmit levels, RTS control, Tx Data clamp, Test Line, loopbacks, send 1004Hz test tone, remote send 1004 Hz test tone
Additional Commands in Network Management Port
Local and remote Show Config
Remote modem Type
Local and remote Set ID
Remote Measure Level
Power requirements: Standard Power Supply:120 VAC, 43 Watts, .36 Amps
Optional Power Supplies available for 12/24/-48 VDC and 120/240 VAC
10 1/4" x 9 3/4" x 2 1/4"
Temperature: -40 to +70 C, Less than 95% non-condensing humidity

Rear view of DCB LL 9.6 Modem





LL 9.6 Sync or Async 9.6Kbps w/ Network Mgmnt Port  
RK-8/16 Rack Mount Shelf  
Various See Power Supply Datasheet  


301-924-7400 EXT 25

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