Data Concentrator, 8 to 32 channel, simplex or duplex

8/16/24/32 Port Model SRDC-08,
SRDC-16, SRDC-24, SRDC-32

  • Simplex or full duplex links
  • Suitable for satellite links
  • Capable of single-direction broadcast operation for multi-drop links
  • Protocol suitable for single-ended de-multiplexing in a PC
  • Synchronous composite to 128 Kbps,
    async to 115.2 Kbps
  • Individually configured asynchronous ports with speeds to 38.4 Kbps (57.6 Kbps on 4-port unit)
  • Network Management Port
  • 4, 8, 16, 24 or 32 channel models
  • Field upgradable
  • Optional internal 56 Kbps DSU/CSU
  • Optional simplex RS-422 composite adapter


The SRDC data concentrator multiplexes 4, 8, 16, 24 or 32 asynchronous channels over a synchronous or asynchronous composite with the ability to operate over simplex or full duplex lines. The links can be modems, DSU's, ISDN, satellite links, radio links, etc. The composite protocol is robust, yet simple enough to be decoded by a PC for custom applications. By decoding the protocol in a PC, the SRDC data concentrator can function as a single ended multiplexer. The decode software specification is available at no cost .

All port parameters are set with an asynchronous terminal connected to the network management port. Set-up procedures are menu driven and fully explained on screen. All configuration parameters are supported through power outages.

The asynchronous ports can be individually set for speeds to 38.4 Kbps (57.6 Kbps on 4-port units). Hardware (CTS) or software (Xon/Xoff even, odd, mark, space or transparent) flow control is also set on a port by port basis.

The SRDC data concentrator composite is synchronous or asynchronous simplex or full duplex lines either analog or digital. The composite can be run at speeds up to 128 Kbps sync, 115.2 Kbps async.

The network management port includes all necessary configuration commands. The Show Configuration Commands allow the system manager to view the configuration settings of the SRDC data concentrator. The network management system is full featured and easy to use. Each SRDC comes with a network management cable and connectors. The commands are simple, in English, and comprehensive. The SRDC can usually be set up without referring to the manual. Each SRDC can have an ID set, and has a built-in "data line monitor" which allows the monitoring of the transmit or receive lines at the local data concentrator.

The SRDC data concentrator has a side panel access for firmware cartridge installation. This feature simplifies installation of upgrades for new features and functions.

The SRDC data concentrators are compatible with virtually all async terminal-printer/computer links. You can save thousands of dollars by concentrating your terminals on one line while delivering top performance.




Asynchronous Statistical Multiplexing
4, 8, 16, 24 or 32 channels
Ports can be set up to 38,400 bps (57.6 Kbps on 4-port units)

Port Specifications

Data Format

1 Start bit
8 Data bits including parity if used
1 Stop bit
10 Bits total

Rates: 300, 1200, 1800, 2400, 4800, 9600, 19200, 38400, (57600 4-port only) bps individually selectable per port
Interface: CCITT V.24, RS-232-D, Optional RS-422/RS-232 external adapter
Connectors: RJ-45 (8-wire)
Buffering: 64K dynamically allocated
Port Flow Control: Set on an individual port basis

Clear to Send

Network Specifications

Rates: Follows modem clock signals to 128 Kbps synchronous, 115.2 asynchronous
Interface: CCITT V.24, RS-232-D, Optional RS-422 simplex composite adapter
Connector: RJ-45 (8-wire)
Non-error corrected composite link
Network to modem/DSU cable included

Operating Modes

Normal on-line multiplexing
Transmit/Receive or receive only mode
Network loopback

Indicators (front panel)

Power, Multiplexing, Receive Error, Modem Ready, Option, Loopback

Network Management Port

Interface: CCITT V.24, RS-232-D
Connector: RJ-45 (8-wire)
Network Management Port to terminal cable included

Network Management Port Commands

Help Screen
Monitor Transmit
Monitor Receive
Network Loopback
Flow Control Active
Set Time


Show Configuration
Show Network
Configure Ports
Configure Network
Port Loopback
Device Type
Activity Counters


Power requirements: 120 VAC, 30-43 Watts, .25-.36 Amps
101/4" x 93/4" x 21/4" (4, 8, or 16 channels)
101/4" x 93/4" x 41/2" (24 or 32 channels)
Temperature: -40 C to +70C


9600 bps V.29 4-wire internal modem
56 Kbps internal DSU/CSU

Rear view of 16 channel DCB SRDC Data Concentrator


How to Order



4 Port Host or Remote Data Concentrator


8 Port Host or Remote Data Concentrator


16 Port Host or Remote Data Concentrator


24 Port Host or Remote Data Concentrator


32 Port Host or Remote Data Concentrator


RS-422 to RS-232 Interface Converter


RS-422 Simplex Composite Adapter


SR Data Concentrator Protocol Specification Document
(Non-Disclosure Agreement Required)


8 Port expansion kit


Integral 56 Kbps DSU/CSU


Rack mount for 4/8/16 port unit


Rack mount for 24/32 port unit

DCB Products