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Your Source for New and Used Extreme 53021 Switch Modules |
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New Extreme Networks Black Diamond P12cSi Switch Module - Line Card - Blade (Extreme Networks 53021).
Looking for Extreme Switch Modules? Network Liquidators holds a huge quantity of new, refurbished, and used Extreme 53021 Switch Modules for sale.
With our state of the art warehouse and shipping, we usually can ship your Extreme 53021 out to you in 1 or 2 business days. Not only do we stock new or used 53021 Switch Modules, we also carry a wide selection of Extreme Black Diamond 6800 accessories, parts, and components.
Unlike many other competitors, we offer a Lifetime Warranty on all pre-owned, refurbished, and used Extreme 53021 (This Warranty applies to End-Users Only).
With our enhanced testing and refurbishing processes, you are guaranteed your 53021 will be in perfect working and physical condition. We are also interested to buy any Extreme Black Diamond 6800 Switch Modules from you at a very reasonable price and will pay all shipping charges to expedite your Extreme equipment to our warehouse facility.
Call us at 1-800-998-9862 Option 1, click the image to the top left of this page to chat live online with a sales representative, email Extreme sales, or Request a Quote by clicking the link above. To limit the type of equipment we may buy from you, it’s important that you know we only buy and sell networking and telecom equipment.
If you are looking for used, refurbished, or new Extreme 53021 or any other piece of Extreme series hardware, please bookmark our site for future reference as we will consistently add inventory. We appreciate your time and business, visit us back anytime.
You may also be interested in Extreme Networks 97004-X350-24T | Extreme Networks 41511
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53021 Product Specifications |
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The Black Diamond 53021 is a 2-port SONET/SDH OC-12c/STM-4 PoS SMF Module.
The BlackDiamond 53021 Blade belongs to the Extreme Black Diamond I Series Blade Family.
What is SONET and SDH?Synchronous optical networking, is a method for communicating digital information using lasers or light-emitting diodes (LEDs) over optical fiber. The method was developed to replace the Plesiochronous Digital Hierarchy (PDH) system for transporting large amounts of telephone and data traffic and to allow for interoperability between equipment from different vendors.
There are multiple, very closely related standards that describe synchronous optical networking:- SDH or synchronous digital hierarchy standard developed by the International Telecommunication Union (ITU), documented in standard G.707 and its extension G.708
- SONET or synchronous optical networking standard as defined by GR-253-CORE from Telcordia
Both SDH and SONET are widely used today: SONET in the U.S. and Canada and SDH in the rest of the world. Although the SONET standards were developed before SDH, their relative penetrations in the worldwide market dictate that SONET now be considered the variation.
Synchronous networking differs from PDH in that the exact rates that are used to transport the data are tightly synchronized across the entire network, made possible by atomic clocks. This synchronization system allows entire inter-country networks to operate synchronously, greatly reducing the amount of buffering required between elements in the network.
Both SONET and SDH can be used to encapsulate earlier digital transmission standards, such as the PDH standard, or used directly to support either ATM or so-called Packet over SONET/SDH (POS) networking. As such, it is inaccurate to think of SDH or SONET as communications protocols in and of themselves, but rather as generic and all-purpose transport containers for moving both voice and data.
For SONET is a signal that operates at 51.84 Mbit/s, designated STS-1 (Synchronous Transport Signal - 1).
For SDH is a signal that operates at 155.52 Mbit/s, exactly three times that of STS-1, designated STM-1 (Synchronous Transport Module level - 1) .
What is OC-12 and STM-4?OC-12 is a network line with transmission speeds of up to 622.08 Mbit/s (payload: 601.344 Mbit/s; overhead: 20.736 Mbit/s). OC-12 lines are commonly used by ISPs as WAN connections. While a large ISP would not use an OC-12 as a backbone (main link), it would for smaller, regional or local connections. This connection speed is also often used by mid-sized (below Tier 2) internet customers, such as web hosting companies or smaller ISPs buying service from larger ones.
What is PoS?Packet over SONET/SDH, abbreviated POS, is a communications protocol for transmitting packets in the form of the Point to Point Protocol over SDH or SONET, which are both standard protocols for communicating digital information using lasers or light emitting diodes (LEDs) over optical fibre at high line rates. POS is defined by RFC 2615 as PPP over SONET/SDH. PPP is the Point to Point Protocol that was designed as a standard method of communicating over point-to-point links. Since SONET/SDH utilises point-to-point circuits, PPP is well suited for use over these links. Scrambling is performed during insertion of the PPP packets into the SONET/SDH frame.
What is MMF?MMF is known as Multi-mode Optical Fiber which is type of optical fiber mostly used for communication over shorter distances, such as within a building. It can carry 1 Gbit/s for typical building distances; the actual maximum data rate (given the right electronics) depends upon the distance. Multi-mode fiber has a higher light-gathering capacity than single-mode optical fiber, making splicing less difficult, but its limit on speed × distance is lower. Because multi-mode fiber has a larger numerical aperture than single-mode fiber, it supports more than one propagation mode, resulting in larger modal dispersion and consequently higher pulse spreading rates, limiting information transmission capacity.
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53021 Information |
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| Manufacturer List Price: |
$45,000.00 |
| Weight: |
15 LBs |
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Inventory Updated on 5/16/2008 |
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