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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.
- 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.
- 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.
- 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.
- 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!
- 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.
- 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.
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