V.29 Multi-Drop Modem Model - LL-9.6FP

9600 bps V.29 / Fast Poll Multidrop, Multipoint Synchronous and Asynchronous modem

  • Multidrop (multipoint) or Point-to-Point
  • 4-wire unconditional leased line operation in asynchronous or synchronous mode
  • 2-wire unconditional leased line operation in asynchronous mode
  • Synchronous or asynchronous
  • LCD display
  • Network Management port
  • Rack mounts in DCB MR-8
  • Addressable remote diagnostics


Indicators (front panel)
Data Port
Network Management
Front Panel and Network Management Port Commands
Additional Commands in Network Management Port


Download the Manual




The DCB LL 9.6 FP modem is a full featured fast poll leased line modem with the best price/benefit ratio in the industry. The LL 9.6 FP modem operates over either two wire or four wire unconditioned leased lines at 9600 bps synchronous or asynchronous. It is an excellent choice for multi-point and point-to-point applications with polled terminal devices.

An LCD front panel or the Network Management Port is used to configure the local modem or perform line diagnostics including the V.54 loopbacks. In addition, the Network Management Port can be used to configure the remote mode.

The LCD front panel is used to set-up the following parameters for the local modem:
Modem Rate
Modem Address
RTS Holdover
RTS Stream
RTS Control
Transmit Carrier
Transmit Clock Source
Synchronous or Asynchronous
Receive Level
Transmit Level
Transmit Data Clamp
Line Type
In addition, the LCD front panel can initiate the following diagnostic tests:
Line Test
Digital Loopback
Analog Loopback
Remote Digital Loopback
Send 1004 Hz tone
Remote send 1004 Hz tone
The LCD front panel continuously updates and displays the receive level. This is the most useful information when diagnosing line troubles with the telephone company.

The Network Management Port is accessed through a 9-pin RS-232-D asynchronous port on the rear panel. It can access all of the set-up and diagnostic tests available through the LCD front panel and be used to configure the remote modem and measure the remote receive level.


Rate: 9600 bps
Fallback rates: 7200 and 4800 bps
Application: Multi-point or point-to-point
Facility: two or Four wire leased lines
Mode: Full Duplex
Signaling: Fast train mode for multidrop, CCITT V.29, Automatic Adaptive Equalization, 2400 baud, QAM modulation, 1700 Hz carrier frequency
Timing: Synchronous or Asynchronous 22 ms RTS/CTS delay
Indicators (front panel)
Power, Transmit Data, Receive Data, Carrier Detect, and Clear to Send
16 character by 2 line LCD display for configuration and testing
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: 9600, 7200 or 4800 bps
Transmit timing: Internal, External or Slave
Receive level: -26 or -43 dBm
Transmit level: 0 to -15 dBm
RTS control: Forced on or from interface
Transmit Data Clamp: On or off
Line Type: 2 wire or 4 wire
Test line
Digital loopback
Local analog loopback
Remote digital loopback
Send 1004 Hz tone
Remote send 1004 Hz 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, 30 Watts
Optional Power Supplies available
10 1/4" x 9 3/4" x 2 1/4"
Temperature: -40 to +75 C, Less than 95% non-condensing humidity

Rear view of DCB LL 9.6 FP Modem


How to Order


LL 9.6FP Sync or Async 9.6Kbps Fast Poll, w/ Network Mgmnt Port $1115
RK-8/16 Rack Mount Shelf $ 60
Various See Power Supply Datasheet

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