Used Extreme 53020 Switch Modules for Sale

Short Description: New Extreme Networks Black Diamond P12cMi Switch Module - Line Card - Blade (Extreme Networks 53020) (Extreme Black Diamond 6800 series)

If you are looking to buy new or used and refurbished Extreme Switch Modules, you can stop searching. Vology has over $50 million of inventory stocked in our warehouse. In addition, we have one of the largest sourcing networks in the industry to locate your Extreme 53020 fast at the best price possible.

*Pricing in our market changes very rapidly, therefore, by contacting us right now you could save more money today vs. tommorow.

Request a Quote for Pricing and Availability from Experts in the Industry!

* E-mail Address:

* Contact Name:

* Phone Number:

* Company Name:

Manufacturer of Interest:

How did you Hear About Us?:

* Items:

53020 Product Specifications

The Black Diamond 53020 is a 2-port SONET/SDH OC-12c/STM-4 PoS MMF Module.

The BlackDiamond 53020 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.