PPP-SR One to Four Port Sync to Async PPP Converter

  • Composite rate to 128 Kbps
  • RS-232 interface @ 57.6 or 115.2 Kbps
  • One or four port models
  • Converts sync PPP protocol to async PPP
  • "AT" command spoofing for Microsoft Windows95 and similar dialers
  • Use over DDS or DDS/frame relay
  • Ideal for Internet or intranets
  • Sync RS-232 network or built-in 56/64Kbps DSU
  • Cost effective versus router + NIC + DSU
  • Reliable, high speed private line service alternative to dial up modems


Indicators (front panel)
Data Port





The DCB PPP-SR translates synchronous PPP to async PPP. It connects remote PCs to the Internet and/or intranet. The PPP-SR accepts IP encapsulated in frame relay PPP or sync PPP from the host router. It converts these protocols to async PPP and passes that to the PCs through its async com ports.

The PPP-SR mimics a generic modem handshake to allow PCs using Microsoft Windows95 (and similar Internet dialers) to use the built in dial-up-networking function, including its PPP protocol. Just select the generic high speed modem, set up a fixed or dynamic TCP/IP address, and go on-line.

The hardware cost savings provide a compelling reason to use the PPP-SR. It is especially cost effective where the host delivers a number of PPP synchronous DS-0 digital channels to the phone company via T1 access multiplexing or frame relay. The PPP-SR is a very cost effective alternative to ISDN. In many areas, phone companies charge ISDN users per minute usage rates. When using frame relay, the PPP-SR can be even more financially attractive.

The PPP-SR is easy to install and operate. Controls on the unit include the loopback push button on the front panel and the Setup switch, used to set the asynchronous terminal interface to 115,200 if the user chooses not to use the default rate of 57,600 bps. The minimum number of controls and comprehensive indicators make installation and troubleshooting easy. Diagnostic aids built into the PPP-SR include LED indicators and loopback capabilities. .



Rates: Up to 128 Kbps synchronous composite, async port rate to 115,200 bps
Application: Point-to-point
Composite and async ports are RS-232.
Supports DDS or frame relay composites to 128 Kbps
RS-232 composite or built-in 56/64 Kbps DSU

Indicators (front panel)

Power, Activity, Line Error, Modem Ready, Port 1 Setup, Loopback


Front panel push button for loopback.
Side door accessible firmware cartridge for installing firmware upgrades
Setup via the "Port One Setup", activated by the front panel push-button, or setup via rear panel setup port

Data Port

Interface: RS-232, V.24, speeds up to 115,200 bps
Connector: RJ-45 per EIA/TIA 561 pin outs


Power requirements: 120 VAC, wall mount power supply
60 Hz, 18 Watts
10 1/4" x 9 3/4" x 2 1/4"
One pound

Rear view of DCB PPP-SR-01



How to Order

PPP-SR-01 1 Port Sync to Async PPP Translator, uses external DSU or IDSN Terminal Adapter$595
PPP-SR-04 4 Port Sync to Async PPP Translator, uses external DSU or IDSN Terminal Adapter$795
PPP-SR-01/DSU*PPP-SR-01 with internal DSU$695
PPP-SR-04/DSU*PPP-SR-04 with internal DSU$895

* See PPP-DSU data sheet for a full description of the product

Data Comm for Business Inc.
2949 County Road 1000 E
Dewey, Il 61840
Voice: 217-897-6600
Toll Free: 800-4-DCB-NET
Toll Free: 800-432-2638
Email: Contact Page
Web: www.dcbnet.com
Fax: 217-897-8023
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