Used Extreme 53111 Switch Modules for Sale

Short Description: New Extreme Networks Black Diamond A3cSi Switch Module - Line Card - Blade (Extreme Networks 53111). (Extreme Black Diamond 6800 series)

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53111 Product Specifications

The Black Diamond 53111 is a 4-Port SONET/SDH OC-3/STM-1 ATM SMF Module.

The BlackDiamond 53111 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 STM-1?

The STM-1 (Synchronous Transport Module) is the basic rate of transmission of the SDH ITU-T fiber optic network transmission standard. It has a bit rate of 155.52 Mbit/s and is the SDH equivalent of an OC-3 (SONET).

What is OC-3c?

OC-3c concatenates three STS-1(OC-1) frames. Concatenated STS(OC) frames carry only one column of path overhead because they cannot be divided into finer granularity signals. Hence, OC-3c can transmit more payload to accommodate a CEPT-4 139.264 Mbps signal. The payload rate is 149.76 Mbps and overhead is 5.76 Mbps.

What is ATM?

Asynchronous Transfer Mode (ATM) is a cell relay, Circuit switching network and data link layer protocol which encodes data traffic into small (53 bytes; 48 bytes of data and 5 bytes of header information) fixed-sized cells. ATM provides data link layer services that run over SONET (Synchronous Optical Networking) Layer 1 links. This differs from other technologies based on packet-switched networks (such as the Internet Protocol or Ethernet), in which variable sized packets (sometimes known as frames) are used. ATM is a connection-oriented technology, in which a logical connection is established between the two endpoints before the actual data exchange begins.

What is SMF?

In fiber-optic communication, a single-mode optical fiber is an optical fiber designed to carry only a single ray of light (mode). This ray of light often contains of a variety of different wavelengths. Although the ray travels parallel to the length of the fiber, it is often called the transverse mode since its electromagnetic vibrations occur perpendicular (transverse) to the length of the fiber. Single-mode optical fibers are also called monomode optical fibers, single-mode optical waveguides, or unimode fibers.

Unlike multi-mode optical fibers, single mode fibers do not exhibit dispersion resulting from multiple spatial modes. Single mode fibers are also better at retai