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Education
Information

We believe that an informed customer is the best customer. In addition to our technical papers, tutorials, and applications notes, we have links to other Internet resources on this page. If you don't find the answers here, send us an email with your questions. We actually answer them!
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Application Notes
and Tutorials

Applications Notes and tutorials help you use DCB equipment to solve your problems. These are usually taken from actual customer projects, cleaned up a little, and made available for others. Some are tutorials, some are papers given at various conferences.


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Categories
WAN
General Info
Frame Relay
ISDN
General Networking
General Info
Reference
Tutorials
Wireless Networking
General Info

SCADA


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General
Index of
Notes

LAN
Ethernet
Serial Connectivity
General Info, Standards
Cables
Internet
General Info
Security


WIDE AREA NETWORKING

General Info

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T-1 Cables and Cross-Talk
We receive many questions about what kind of cable works best for T-1 extensions. Many people mistakenly believe Cat-5 LAN cable works well. Here's the scoop... a technical discussion about why you should use real T-1 cable, and some manufacturer's part numbers. T-1 Cables and Cross Talk

Solving T-1 Problems with the T-Extender
This application note illustrates how to solve common T-1 demarc problems by using the T-Extender. The T-Extender is a no-configuration T-1 repeater/extender that allows a T-1 line to stretch 5,000 feet or longer. Read the application note here.

Where'd the "T" in T-1 come from?
After reading our T1 white paper, a number of customers asked us "Where'd the "T" come from in T-1, T-3, etc.? There are many stories floating around (such as T=Time, T= Transmission, T=Terrestrial, Just the next letter in sequence, etc.). We thought the best place to get the true story would be from someone who helped develop this technology. So, we asked our fiend Dr John Pan.
Here's his answer.

Port Redirection and the EtherPath
"Using the EtherPath with Unix and PC Port Redirection" is an article that discusses the options available when using port redirection software and custom-written software to access remote serial ports with the EtherPath serial device server. Sources of sample programs and free port redirector software are provided.Read the article!

Embedded Server Technology to Connect RS232 Devices
"Globally Serial: Extending the Reach of your Serial Devices Around the World" is an article that recently apeared in information technology trade journals. This article discusses the use of DCB's EtherPath external device servers and how they are used to connect RS-232 serial devices using a wide area ethernet network. Read the article!

Using the SR-DC Data Concentrator Multiplexer
Describes how to use the unique features of the SR-DC such as single-ended operation with data stream decode by user-provided workstations, one-way data transmission of multiplexed data to multiple receiving sites, and half-duplex operation over slow links such as satellite or radio links.

Managing Multiplexer Based Wide Area Networks:
Describes how inexpensive tools can be utilized to manage small to large sized WANs based upon multiplexers. "SNMP or not" is often the question. Look here for an answer.
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Automated Dial-up Router and Bridge Connections Using Windows workstations
An application note that details one common method of automating the use of IP-6600 routers and ET-6600 bridges to dial multiple remote locations on a scheduled or automated basis.

High Availability Networking with DCB SR Async Frads
How one DCB customer, Merchant's Tire, solved their high availability frame relay networking problems using DCB Async FRAD Multiplexers.

Network Management, SNMP vs. Out-of-Band Management.
The realities of managing your LAN/WAN with SNMP and how Out-of-Band management can make the system more effective.

The True Story...Terminal Servers VS. Multiplexer Systems
Do you want to install remote terminal servers or multiplexers? Get the facts and do the analysis. You may be surprised!

Saving Time and Money... The DCB Access Switch and Remote Maintenance
Ways to save money and time by using the DCB Access Switch.

Mix 'n Match: Running Routers behind the DCB Multiplexer
Details how you can add LAN routers to existing DCB multiplexer WAN connections. Saves money by adding email and low-priority LAN traffic to your existing WAN.

All You Wanted to Know About T1 But Were Afraid to Ask
A complete explanation of T1 in all its gory details from basics to signaling. Written for our distributors and rather deep.

Connecting Remote Terminals:Wireless WAN Links Reduce Telephone Cost to Zero!
Example showing how wireless links and multiplexers replace telephone lines for wide area terminal connections.

Connecting Remote LANs:Wireless WAN Links Reduce Telephone Cost to Zero!
Example showing how wireless links replace telephone lines for wide area networking.

Network Management with SNMP

Extend In-house T-1 Links with the T-Extender
A short note describing the problem of long T-1 lines and how the T-Extender has solved it.

Small Business Series: Connecting Remote Office LANs
You have LANs in two offices. Now, you want to connect them together.

Small Business Series: Data Communications, A Primer
A simple, no-fluff examination of the choices available for data communications. Learn what your consultant is talking about.

Multiplexers Connect Using Ethernet And New Ethernet Serial Server
Details how you can use DCB multiplexers over ethernet LAN/WAN connections. More efficient than terminal servers!



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Frame Relay

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Frame Relay versus Analog Circuits... Reliability and Maintainability Issues
Customers often ask "What is the reliability of Frame Relay versus analog phone lines?". In our experience, the Frame Relay service has been more reliable. This discussion presents some evidence and technical information that supports this improved reliability.

High Availability Networking with DCB SR Async Frads
How one DCB customer, Merchant's Tire, solved their high availability frame relay networking problems using DCB Async FRAD Multiplexers.

Private Frame Relay network saves money and time.
Customer success story. How a private frame relay network was used in an RS-6000 and SCO Unix wide area network to extend the life of older equipment and save money and time.

Frame Relay: An Overview
A Paper describing Frame Relay originally delivered to the Third Annual Traffic Communications Seminar, Tahoe, October 1995 and updated March, 1997.

DCB SR Multiplexer and Cisco routers co-exist with frame relay
You can locate our SR Multiplexer behind a frame relay router to let RS-232 and LAN traffic share the WAN.

Frame Relay Forum
The Frame Relay Forum website from the industry group publishing frame relay standards.

Cisco Frame Relay Tutorial
Cisco points their people to some of our tutorials... thought we'd return the favor. This is a very good Frame Relay tutorial, although it's oriented towards routers. Frame Relay is the same, we simply use it to transport other protocols in addition to LAN traffic.



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ISDN

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SPL Multiplexers, ISDN and One Touch Dial
Using ISDN and One-Touch Dial with SPL Multiplexers for on-demand connections

Pacbell's ISDN page
Pacific Bell's informative web site on ISDN. Look at their ISDN User's Guide from this page!


LOCAL AREA NETWORKING

Ethernet

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Tunnel IPv6 Via IPv4 WANs
IPv6 LAN traffic is easily tunneled through IPv4 WAN connections using one of the DCB encrypted tunnel family products from the UT, ET, or FT series. Since the encrypted tunnels package and transport all ethernet protocols, there's no IPv6 configuration required. Quick, economical, and simple! Read the application note here.

Automated Dial-up Router and Bridge Connections Using Windows workstations
An application note that details one common method of automating the use of IP-6600 routers and ET-6600 bridges to dial multiple remote locations on a scheduled or automated basis.

TCP/IP Addressing and the PPP-SR Simple Router
Short discussion on how to conserve IP Addresses by putting up to 128 remote locations in a single Class "C" address space using the PPP-SR Simple Router.

Network Management, SNMP vs. Out-of-Band Management.
The realities of managing your LAN/WAN with SNMP and how Out-of-Band management can make the system more effective.

Connecting Remote LANs:Wireless WAN Links Reduce Telephone Cost to Zero!
Example showing how wireless links replace telephone lines for wide area networking.

Small Business Series: Connecting your LAN to the Internet
You have a local office LAN. Now, you want Internet access for everyone!

Small Business Series: Connecting Remote Office LANs
You have LANs in two offices. Now, you want to connect them together.

Small Business Series: Data Communications, A Primer
A simple, no-fluff examination of the choices available for data communications. Learn what your consultant is talking about.

Mix 'n Match: Running Routers behind the DCB Multiplexer
Details how you can add LAN routers to existing DCB multiplexer WAN connections. Saves money by adding email and low-priority LAN traffic to your existing WAN.

Multiplexers Connect Using Ethernet And New Ethernet Serial Server
Details how you can use DCB multiplexers over ethernet LAN/WAN connections. More efficient than terminal servers!

Network Management with SNMP
A beginner's introduction to SNMP.. This one ends where most SNMP introductions begin.

Charles Spurgeon's Quick Reference Guide to Ethernet
A very good reference work on Ethernet, LAN Configuration, 10BaseEverything, etc. And, it's hypertext!

DCB SR Multiplexer and Cisco routers co-exist with frame relay
You can locate our SR Multiplexer behind a frame relay router to let RS-232 and LAN traffic share the WAN.


SERIAL CONNECTIVITY

General Info and Serial Interface Standards

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Port Redirection and the EtherPath
"Using the EtherPath with Unix and PC Port Redirection" is an article that discusses the options available when using port redirection software and custom-written software to access remote serial ports with the EtherPath serial device server. Sources of sample programs and free port redirector software are provided.Read the article!

Transferring Asynchronous Data Using Synchronous Paths
This educational paper describes the various methods used to transport asynchronous data through synchronous links. In some applications, only asynchronous ports are available on the end equipment, while the only practical communication path is synchronous. The concept of "oversampling", dedicated hardware, and reasons for selecting each are detailed.Read the article!

Embedded Server Technology to Connect RS232 Devices
"Globally Serial: Extending the Reach of your Serial Devices Around the World" is an article that recently apeared in information technology trade journals. This article discusses the use of DCB's EtherPath external device servers and how they are used to connect RS-232 serial devices using a wide area ethernet network. Read the article!
Frequently Asked Questions about Cabling.
This is the "FAQ" document for the comp.dcom.cabling newsgroup. Topics covered include the types of cables (fiber, coax, copper, unshielded twisted pair-UTP, shielded twisted pair), installation techniques, standards as well as fire and building safety codes. A mirror of the faq maintained by Peter Macaulay (pmac@fox.nstn.ca)

Using the SR-DC Data Concentrator Multiplexer
Describes how to use the unique features of the SR-DC such as single-ended operation with data stream decode by user-provided workstations, one-way data transmission of multiplexed data to multiple receiving sites, and half-duplex operation over slow links such as satellite or radio links.

Managing Multiplexer Based Wide Area Networks:
Describes how inexpensive tools can be utilized to manage small to large sized WANs based upon multiplexers. "SNMP or not" is often the question. Look here for an answer.

Web site for EIA.
The Electronics Industry Association is the source of those RS type specs. Get them from the source!

EIA-561 Standard for RS-232 signals on the 8-conductor RJ-45/48

RS-530 Standard

V.35 Interface Standard Pinout

Multiplexers Connect Using Ethernet And New Ethernet Serial Server
Details how you can use DCB multiplexers over ethernet LAN/WAN connections. More efficient than terminal servers!

Connecting Remote Terminals:Wireless WAN Links Reduce Telephone Cost to Zero!
Example showing how wireless links and multiplexers replace telephone lines for wide area terminal connections.

Saving Time and Money... The DCB Access Switch and Remote Maintenance
Ways to save money and time by using the DCB Access Switch.

Extend In-house T-1 Links with the T-Extender
A short note describing the problem of long T-1 lines and how the T-Extender has solved it.


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Cable Selection Guides

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Cable Selection Guides
Go here to select the proper cable for your application. If you know the equipment you want to connect, here's where you find out which cables you need.

Cable and Hood Wiring Diagrams
Actual part numbers, prices, and wiring diagrams for our cables. Build your own if you want, or purchase ours.. pretested and built with quality components.

Frequently Asked Questions about Cabling.
This is the "FAQ" document for the comp.dcom.cabling newsgroup. Topics covered include the types of cables (fiber, coax, copper, unshielded twisted pair-UTP, shielded twisted pair), installation techniques, standards as well as fire and building safety codes. A mirror of the faq maintained by Peter Macaulay (pmac@fox.nstn.ca)


GENERAL NETWORKING

General Info

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Port Redirection and the EtherPath
"Using the EtherPath with Unix and PC Port Redirection" is an article that discusses the options available when using port redirection software and custom-written software to access remote serial ports with the EtherPath serial device server. Sources of sample programs and free port redirector software are provided.Read the article!


Network Management, SNMP vs. Out-of-Band Management.
The realities of managing your LAN/WAN with SNMP and how Out-of-Band management can make the system more effective.

Multiplexers Connect Using Ethernet And New Ethernet Serial Server
Details how you can use DCB multiplexers over ethernet LAN/WAN connections. More efficient than terminal servers!

Mix 'n Match: Running Routers behind the DCB Multiplexer
Details how you can add LAN routers to existing DCB multiplexer WAN connections. Saves money by adding email and low-priority LAN traffic to your existing WAN.

Lightning and Power Surge Damage and Prevention
A short paper describing the problems caused by lightning and power surges along with some things you can do to prevent them.

DCB SR Multiplexer and Cisco routers co-exist with frame relay
You can locate our SR Multiplexer behind a frame relay router to let RS-232 and LAN traffic share the WAN.

The True Story...Terminal Servers VS. Multiplexer Systems
Do you want to install remote terminal servers or multiplexers? Get the facts and do the analysis. You may be surprised!

Note on load balancing SRX/SPL Multi-host systems.
Tech Note that explains load balancing drops when using multiple SRX host multiplexers on a multi-drop line.


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Reference

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Frequently Asked Questions about Cabling.
This is the "FAQ" document for the comp.dcom.cabling newsgroup. Topics covered include the types of cables (fiber, coax, copper, unshielded twisted pair-UTP, shielded twisted pair), installation techniques, standards as well as fire and building safety codes. A mirror of the faq maintained by Peter Macaulay (pmac@fox.nstn.ca)

Steve Kropla's Help For World Travelers!
The best source for information on world power and telephone connector standards. If you travel internationally, you need to know about Steve Kropla.


WIRELESS NETWORKING

General Info

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Solving ISM Band Coverage Problems Using Antenna Diversity
DCB is often called upon to assist customers having unusual problems. One of those we commonly run into is the application of ISM band radio equipment in unique situations. This is an introduction to the methodologies we use in those applications.

Wireless Connections.. The Reality.
Some rules of thumb that can help you make a good wireless decision. Basic, required reading for everyone considering that first wireless link.

AirLink Raven (and Redwing) CDPD Modems and the IP-5200 Router Application Note on connecting the AirLink Raven CDPD Modem to Ethernet Devices using the IP 5200 from DCB This is Copyright March 2002 AirLink Communications, Inc. an dused by permission. This is a step-by-step cookbook that makes it easy.

Voice/Data Multiplexing With Utilicom Wireless Modems
Describes how to configure Utilicom wireless modems and our 2200 voice/data multiplexer to allow two voice and two data channels to share one wireless link.

Reducing Phone Line Cost with Microwave Bypass
(In this case, even using a Passive Repeater)
Short description of how one DCB customer installed a T-1 speed microwave wireless link using a passive reflector to bypass the local telephone company loop.

Another School 10 Mbps Wireless System is Turned up by DCB.
DCB and the Mendota, IL Elementary School District team up to install wireless 10 Mbps networking between three schools.

Connecting Remote Terminals:Wireless WAN Links Reduce Telephone Cost to Zero!
Example showing how wireless links and multiplexers replace telephone lines for wide area terminal connections.

Connecting Remote LANs:Wireless WAN Links Reduce Telephone Cost to Zero!
Example showing how wireless links replace telephone lines for wide area networking.


Security Applications

General Info

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ET Encrypted Bridge Quick-Start Installation Guide
A cookbook style quick start guide to installing the ET Encrypted Bridges. Illustrates common usage examples with fill-in-the-blank instructions.

ET-3300/6600 Encrypted Bridge Applications
Some ways the ET products are being used to tunnel IP traffic in the real world.

Using the ET-6601 Encrypted Bridge with EVDO & Wifi
Discusses using the ET-6601 with high speed cellular modems and 802.11 Wifi wide area connections.

ET Encrypted Bridge Installation Option
An application note describing an appliance-like installation that allows the ET to be located anywhere on the local LAN. Known around DCB as the "Single-Port Installation".

Using the ET Encrypted Bridges with 801.Q VLANs
Discusses configuring the ET products to handle 801.Q VLAN traffic. The ET supports 801.Q VLAN tagged packets, and allows a VLAN to span multiple IP networks.

Using the UT Encrypted Bridges and UT-SOFT with IP Multicast.
Discusses applying the UT products to transport VOIP multicast via non-multicast wide area networks. Examples showing IP voice dispatch radios for public service agencies. The UT supports multi-cast IP over normal uni-cast networks and allows a private multi-cast network to span multiple IP networks. The UT-SOFT software client allows any PC to be a securely connected node on a remote network

Using the ET Encrypted Bridges with IP Multicast.
Discusses applying the ET products to transport VOIP multicast via non-multicast wide area networks. Examples showing IP voice dispatch radios for public service agencies. The ET supports multi-cast IP over normal uni-cast networks and allows a private multi-cast network to span multiple IP networks.

Automating Dial-Up Router and Bridge PPP Connections
An application note that details one common method of automating the use of IP-6600 routers and ET-6600 bridges to dial multiple remote locations on a scheduled or automated basis.

CONNECTING TO THE INTERNET

General Info

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The AUTHORITATIVE Internet Reference site (Internic)
This is the source for those RFC's (Request for Comments), FYI's (For Your Information), STD's (IETF Standards), and other Internet Engineering Task Force (IETF) or Internet Society documents.


SCADA

General Info

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Smart Metering using DCB communications products.
Utilities have discovered the ease and security benefits of using DCB's encrypted ethernet bridging products for backhauling smart grid information. Securely transport proprietary, private information on the shared, public network. Read it now.

SCADA Protocols over Frame Relay -
Supporting Modbus, DNP, and others without configuration?
DCB supplies several products that allow asynchronous SCADA protocols such as DNP and Modbus to be transported using frame relay or ethernet networks. One unique feature of these products is their ability to handle most any byte-oriented protocol without protocol specific configuration. This short note describes this feature and its benefits along with some information on how it works. Read it now.

SCADA Communications Using Commercial Frame Relay Networks
The most commonly used wide area networking technology for SCADA systems is the venerable leased line and multi-drop modem. The infrastructure required to support this technology is fast becoming excessively costly as telephone carriers migrate to packet switched technology solutions. Current SCADA systems can be migrated to new Frame Relay wide area networks without costly deployment of new RTU and host equipment by using Frame Relay FRADS designed to support legacy SCADA protocols. This paper discusses the economics, practicality, and reliability of commercial Frame Relay networking for SCADA systems. Originally presented at Entelec 2001.
Read it now.


SCADA over Frame Relay - How Much Bandwidth is really needed?
SCADA applications over Frame Relay require very little bandwidth. So why would we even bring up the discussion about bandwidth when using our BPF (a SCADA FRAD communications device) for SCADA over Frame Relay? Because the issue comes up every single time a customer installs a system.
Here are the facts.

CDPD Modems And Remote Ethernet Devices
Most CDPD modems are designed to connect to remote devices (such as a laptop)using ppp, and with the proliferation of ethernet-enabled remote devices, a method is needed to connect the serial RS-232 CDPD modem to one or more ethernet-enabled RTU devices at remote sites along with serial devices. The DCB IP-5200 micro-router application described in this paper is an example of this technology in use. Along with the IP-5200, an EtherPath ethernet to serial converter may be used for direct access to serial devices. Read the article!

Port Redirection and the EtherPath
"Using the EtherPath with Unix and PC Port Redirection" is an article that discusses the options available when using port redirection software and custom-written software to access remote serial ports with the EtherPath serial device server. Sources of sample programs and free port redirector software are provided.Read the article!

SCADA Communications over Frame Relay: Introducing the Broadcast Polling FRAD
An overview of Frame Relay communications and how it is useful for SCADA communications. This white paper details the way Frame Relay can be used with asynchronous polling SCADA RTUs with no additional protocol needed on the RTU or host computer. DCB's frame relay access device, the BPF SCADA FRAD handles the interface between your multi-drop SCADA system and the Frame Relay network.

Supervisory Control and Data Acquisition:
The challenge of increased computer power, higher speeds and modern networks
A look at factors driving the changing modern SCADA and how some DCB products help SCADA users cope with that change.

Mecklenburg Electric Cooperative Devises Innovative use of Multiplexers to Save over $70,000 a year.
How a large electric cooperative used DCB SCADA Multiplexers to combine a Load Management System and a SCADA system over a single multi-drop radio system. Using SCADA-Mux equipment, two SCADA systems with incompatible protocols are communicating over an economical wide area network.

Frame Relay versus Analog Circuits... Reliability and Maintainability Issues
Customers often ask "What is the reliability of Frame Relay versus analog phone lines?". In our experience, the Frame Relay service has been more reliable. This discussion presents some evidence and technical information that supports this improved reliability.

Wireless Connections.. The Reality.
Some rules of thumb that can help you make a good wireless decision. Basic, required reading for everyone considering that first wireless link.

Using the SR-DC Data Concentrator Multiplexer
Describes how to use the unique features of the SR-DC such as single-ended operation with data stream decode by user-provided workstations, one-way data transmission of multiplexed data to multiple receiving sites, and half-duplex operation over slow links such as satellite or radio links.

On-Line Demo of EtherPath and Access Switch via the Internet
Quickly check out the on-line use of our EtherPath, Access Switch, Remote Power Control, and the network management and configuration features of our SR, SRX, and SPL multiplexers through the Internet. Telnet to the Etherpath from your PC via the Internet.

Network Management, SNMP vs. Out-of-Band Management.
The realities of managing your LAN/WAN with SNMP and how Out-of-Band management can make the system more effective.

Saving Time and Money... The DCB Access Switch and Remote Maintenance
Ways to save money and time by using the DCB Access Switch.

Frame Relay: An Overview
A Paper describing Frame Relay originally delivered to the Third Annual Traffic Communications Seminar, Tahoe, October 1995 and updated in March, 1997.


APPLICATION NOTE INDEX

General Info

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T-1 Cables and Cross-Talk
We receive many questions about what kind of cable works best for T-1 extensions. Many people mistakenly believe Cat-5 LAN cable works well. Here's the scoop... a technical discussion about why you should use real T-1 cable, and some manufacturer's part numbers. T-1 Cables and Cross Talk

Solving T-1 Problems with the T-Extender
This application note illustrates how to solve common T-1 demarc problems by using the T-Extender. The T-Extender is a no-configuration T-1 repeater/extender that allows a T-1 line to stretch 5,000 feet or longer. Read the application note here.
SCADA Protocols over Frame Relay -
Supporting Modbus, DNP, and others without configuration?
DCB supplies several products that allow asynchronous SCADA protocols such as DNP and Modbus to be transported using frame relay or ethernet networks. One unique feature of these products is their ability to handle most any byte-oriented protocol without protocol specific configuration. This short note describes this feature and its benefits along with some information on how it works. Read it now.

AirLink Raven (and Redwing) CDPD Modems and the IP-5200 Router Application Note on connecting the AirLink Raven CDPD Modem to Ethernet Devices using the IP 5200 from DCB This is Copyright March 2002 AirLink Communications, Inc. an dused by permission. This is a step-by-step cookbook that makes it easy.

SCADA Communications Using Commercial Frame Relay Networks
The most commonly used wide area networking technology for SCADA systems is the venerable leased line and multi-drop modem. The infrastructure required to support this technology is fast becoming excessively costly as telephone carriers migrate to packet switched technology solutions. Current SCADA systems can be migrated to new Frame Relay wide area networks without costly deployment of new RTU and host equipment by using Frame Relay FRADS designed to support legacy SCADA protocols. This paper discusses the economics, practicality, and reliability of commercial Frame Relay networking for SCADA systems. Originally presented at Entelec 2001.
Read it now.


SCADA over Frame Relay - How Much Bandwidth is really needed?
SCADA applications over Frame Relay require very little bandwidth. So why would we even bring up the discussion about bandwidth when using our BPF (a SCADA FRAD communications device) for SCADA over Frame Relay? Because the issue comes up every single time a customer installs a system.
Here are the facts.

Where'd the "T" come from in T-1, T-3, etc.?
After reading our T1 white paper, a number of customers asked us "Where'd the "T" come from in T-1, T-3, etc.? There are many stories floating around (such as T=Time, T= Transmission, T=Terrestrial, Just the next letter in sequence, etc.). We thought the best place to get the true story would be from someone who helped develop this technology. So, we asked our fiend Dr John Pan.
Here's his answer.

CDPD Modems And Remote Ethernet Devices
Most CDPD modems are designed to connect to remote devices (such as a laptop)using ppp, and with the proliferation of ethernet-enabled remote devices, a method is needed to connect the serial RS-232 CDPD modem to one or more ethernet-enabled RTU devices at remote sites along with serial devices. The DCB IP-5200 micro-router application described in this paper is an example of this technology in use. Along with the IP-5200, an EtherPath ethernet to serial converter may be used for direct access to serial devices. Read the article!

Port Redirection and the EtherPath
"Using the EtherPath with Unix and PC Port Redirection" is an article that discusses the options available when using port redirection software and custom-written software to access remote serial ports with the EtherPath serial device server. Sources of sample programs and free port redirector software are provided.Read the article!


Embedded Server Technology to Connect RS232 Devices
"Globally Serial: Extending the Reach of your Serial Devices Around the World" is an article that recently apeared in information technology trade journals. This article discusses the use of DCB's EtherPath external device servers and how they are used to connect RS-232 serial devices using a wide area ethernet network. Read the article!

SCADA Communications over Frame Relay: Introducing the Broadcast Polling FRAD
An overview of Frame Relay communications and how it is useful for SCADA communications. This white paper details the way Frame Relay can be used with asynchronous polling SCADA RTUs with no additional protocol needed on the RTU or host computer. DCB's frame relay access device, the BPF SCADA FRAD handles the interface between your multi-drop SCADA system and the Frame Relay network.

Frame Relay versus Analog Circuits... Reliability and Maintainability Issues
Customers often ask "What is the reliability of Frame Relay versus analog phone lines?". In our experience, the Frame Relay service has been more reliable. This discussion presents some evidence and technical information that supports this improved reliability.

Mecklenburg Electric Cooperative Devises Innovative use of Multiplexers to Save over $70,000 a year.
How a large electric cooperative used DCB SCADA Multiplexers to combine a Load Management System and a SCADA system over a single multi-drop radio system. Using SCADA-Mux equipment, two SCADA systems with incompatible protocols are communicating over an economical wide area network.

Supervisory Control and Data Acquisition:
The challenge of increased computer power, higher speeds and modern networks
A look at factors driving the changing modern SCADA and how some DCB products help SCADA users cope with that change.


Remote Network Management Cuts Into Frequent Flyer Miles:
Prudential Securities Solidifies Nationwide Network Uptime
Customer success story about Prudential Securities using DCB Access Switches to lower cost and improve network uptime.

Wireless Connections.. The Reality.
Some rules of thumb that can help you make a good wireless decision. Basic, required reading for everyone considering that first wireless link.

Using the SR-DC Data Concentrator Multiplexer
Describes how to use the unique features of the SR-DC such as single-ended operation with data stream decode by user-provided workstations, one-way data transmission of multiplexed data to multiple receiving sites, and half-duplex operation over slow links such as satellite or radio links.

Voice/Data Multiplexing With Utilicom Wireless Modems
Describes how to configure Utilicom wireless modems and our 2200 voice/data multiplexer to allow two voice and two data channels to share one wireless link.

Managing Multiplexer Based Wide Area Networks:
Describes how inexpensive tools can be utilized to manage small to large sized WANs based upon multiplexers. "SNMP or not" is often the question. Look here for an answer.

On-Line Demo of EtherPath and Access Switch via the Internet
Quickly check out the on-line use of our EtherPath, Access Switch, Remote Power Control, and the network management and configuration features of our SR, SRX, and SPL multiplexers through the Internet. Telnet to the Etherpath from your PC via the Internet.

High Availability Networking with DCB SR Async Frads
How one DCB customer, Merchant's Tire, solved their high availability frame relay networking problems using DCB Async FRAD Multiplexers.

TCP/IP Addressing and the PPP-SR Simple Router
Short discussion on how to conserve IP Addresses by putting up to 128 remote locations in a single Class "C" address space using the PPP-SR Simple Router.

Reducing Phone Line Cost with Microwave Bypass
(In this case, even using a Passive Repeater)
Short description of how one DCB customer installed a T-1 speed microwave wireless link using a passive reflector to bypass the local telephone company loop.

Network Management, SNMP vs. Out-of-Band Management.
The realities of managing your LAN/WAN with SNMP and how Out-of-Band management can make the system more effective.

Private Frame Relay network saves money and time.
Customer success story. How a private frame relay network was used in an RS-6000 and SCO Unix wide area network to extend the life of older equipment and save money and time.

Mix 'n Match: Running Routers behind the DCB Multiplexer
Details how you can add LAN routers to existing DCB multiplexer WAN connections. Saves money by adding email and low-priority LAN traffic to your existing WAN.

Multiplexers Connect Using Ethernet And New Ethernet Serial Server
Details how you can use DCB multiplexers over ethernet LAN/WAN connections. More efficient than terminal servers!

SPL Multiplexers, ISDN and One Touch Dial
Using ISDN and One-Touch Dial with SPL Multiplexers for on-demand connections.

All You Wanted to Know About T1 But Were Afraid to Ask
A complete explanation of T1 in all its gory details from basics to signaling. Written for our distributors and rather deep.

The True Story...Terminal Servers VS. Multiplexer Systems
Do you want to install remote terminal servers or multiplexers? Get the facts and do the analysis. You may be surprised!

Connecting Remote Terminals:Wireless WAN Links Reduce Telephone Cost to Zero!
Example showing how wireless links and multiplexers replace telephone lines for wide area terminal connections.

Note on load balancing SRX/SPL Multi-host systems.
Tech Note that explains load balancing drops when using multiple SRX host multiplexers on a multi-drop line.

Connecting Remote LANs:Wireless WAN Links Reduce Telephone Cost to Zero!
Example showing how wireless links replace telephone lines for wide area networking.

Network Management with SNMP
A beginner's introduction to SNMP.. This one ends where most SNMP introductions begin.

Saving Time and Money... The DCB Access Switch and Remote Maintenance
Ways to save money and time by using the DCB Access Switch.

Extend In-house T-1 Links with the T-Extender
A short note describing the problem of long T-1 lines and how the T-Extender has solved it.

Small Business Series: Connecting your LAN to the Internet
You have a local office LAN. Now, you want Internet access for everyone!

Small Business Series: Connecting Remote Office LANs
You have LANs in two offices. Now, you want to connect them together.

Small Business Series: Data Communications, A Primer
A simple, no-fluff examination of the choices available for data communications. Learn what your consultant is talking about.

Frame Relay: An Overview
A Paper describing Frame Relay originally delivered to the Third Annual Traffic Communications Seminar, Tahoe, October 1995 and updated in March, 1997.

Lightning and Power Surge Damage and Prevention
A short paper describing the problems caused by lightning and power surges along with some things you can do to prevent them.

DCB SR Multiplexer and Cisco routers co-exist with frame relay
You can locate our SR Multiplexer behind a frame relay router to let RS-232 and LAN traffic share the WAN.

Another School 10 Mbps Wireless System is Turned up by DCB.
DCB and the Mendota, IL Elementary School District team up to install wireless 10 Mbps networking between three schools.

More to come...


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