The X2 group was announced on July 22, 2002, and published their specification on February 13, 2003. Issue 3.0 of the XENPAK MSA was transferred to the Small Form Factor committee as document INF-8474 on September 18, 2002. The XENPAK MSA website existed through the end of 2008. It uses same type of optical and electrical inteface as XENPAK, generally speaking X2 transceiver was introduced to the market as the successor of bulky XENPAK modules. Transmission speed can reach up to 11.3Gbps. As of 2010, vendors generally changed to use XFP modules for longer distances, and Enhanced small form-factor pluggable transceivers, known as SFP+ modules, for higher densities. The newer modules have a purely serial interface, compared to the four lane XAUI interface used in X2. For details please check categories such as: BiDi (WDM), Dual Fiber (Gray), CWDM and DWDM.

Transceiver can be prepared as compatible with: Cisco, HP, Netgear, Avaya, D-Link, Brocade, Extreme Networks, Huawei, Enterasys, 3Com, Alcatel-Lucent and other. To confirm compatibility please contact technical support before ordering.

For more information please check categories of X2 optical transceivers listed below.