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                 Midspan Injectors for
                 POWERoverETHERNET
                 Fully IEEE 802.3af Compliant

                Call SEI at (800) 765-4734 to order or Buy it Now!

What is a Midspan?

The Midspan is SEI's midspan Power over Ethernet solution for VoIP, Wireless Access Points, and other PoE applications. SEI's Midspan is fully compliant with the IEEE 802.3af Power over Ethernet standard and will also provide power to many legacy devices. With a Midspan there is no need to replace your existing Ethernet infrastructure to realize the advantages of Power over Ethernet.

Why use Power over Ethernet (PoE)?

PoE allows power to be supplied to end devices, such as Wireless Access Points or VoIP Phones, directly through the existing LAN cables. By supplying the power mid-span, you can centralize power distribution and backup without the need to increase infrastructure.

What are the advantages of mid-span power?

Midspans eliminate the cost and need to upgrade to power enables switches to run PoE applications. Installation costs as well as desktop and wall clutter are significantly reduced. SEI's Midspan allows centralized backup power for all connected device which is less expensive, more reliable and easier to maintain than individual UPS backup. The Midspan can be supplied with backup power from the existing Ethernet switch UPS or, to increase reliability, with its own dedicated SEI supplied UPS.

How does a Midspan increase Quality of Service?
Voice-Over-IP (VoIP) telephony allows the convergence of voice and data traffic on a packet switched data network. Organizations implementing this technology must provide QoS equivalent to that of traditional PBX and Centrex solutions. This requires centralized power and battery backup for VoIP phone sets to guard against the loss of AC power and the resulting loss of phone service. For a technical discussion of this topic, see our white paper, VoIP Phoneset Power Via the Ethernet.  While not formally termed QoS, other Ethernet applications such as wireless access points and security cameras also have high availability requirements. SEI's Midspan, coupled with a UPS, provides simple, centralized, guaranteed power for VoIP phonesets and other Ethernet-based applications.
How does SEI's Midspan reduce cost?
With a full 24 ports of power for the cost of a typical 12 port solution, SEI'sMidspan allows easy migration to IP-based telephony with no expansion costs and without the replacement of expensive network infrastructure.  Our Midspan can either be supplied with battery backup using the switch UPS or to increase or to increase reliability, with its own dedicated SEI DC UPS.
What do I look for in mid-span power?
Consider the following: Is it a cost effective solution? Is it manageable through a Web/SNMP interface? Can power be backed up independent of a central UPS? Where is it made? Is the manufacturer licensed to make and sell the device so it doesn't infringe on the patent? How many ports are powered by each PoE chip? Is the manufacturer experienced delivering power inline? Click here to read the full text.
How do I add backup power?

If you lose building power, midspan devices are typically backed up using standard UPS methodology. However, these devices add a significant additional power draw on the UPS which can severely impact hold-over time. Thirty minutes of hold over for a typical switch configuration can be reduced to 5 minutes or less by adding a midspan and 24 VoIP phones. Upgrading or replacing the existing UPS to maintain adequate hold over is very expensive.

SEI's Midspans have an integrated UPS interface to accept their own battery hold-over. This Battery pack provides power directly to the PoE devices without stealing power from the switch's UPS and is available in a variety of hold-over times to meet specific needs.

Why work with SEI?
Founded in 1977, System Engineering International is a leader in centralized, premises powering.  Our products power the majority of Centrex phone systems in the U.S. With a tremendous presence in the large business, education, and government markets, SEI has the experience to support the demanding requirement of the enterprise customer.
What happened to the Juice Box?
SEI has decided to use the generic description, "Midspan Injector" in place fo the name "Juice Box." The Juice color of the original units have been retained to maintain a continuity with the Juice Box name, quality, and reliability.
  SEI - Telephony Products

For order information or technical support, call us at
800-765-4734
or email us using our Contact Us form


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System Engineering International, Inc.
5115 Pegasus Court, Suite Q, Frederick MD 21704
Voice: (301) 694-9601    Fax: (301) 694-9608    E-mail: info@seipower.com


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