Definition

pseudowire

Pseudowire ( sometimes spelled as "pseudo wire" or abbreviated as PW) is a mechanism for emulating various networking or telecommunications services across packet-switched networks that use Ethernet, IP, or MPLS. Services emulated can include T1 leased line, frame relay, Ethernet, ATM, TDM, or SONET/SDH. As defined in RFC 3985 ("Pseudo Wire Emulation Edge-to-Edge [PWE3] Architecture") a pseudowire delivers the bare minimum of functionality necessary to emulate a wire with some required degree of fidelity for some specific service definition.

Required functions for PWs include the following:

  • Encapsulating service-specific bit streams, cells, or protocol data units (PDUs) that appear at some ingress port, then ferrying them across some IP path or through an MPLS tunnel.
  • Occasionally managing order and timing of incoming PW traffic so as to properly emulate a service with the necessary fidelity (TDM and ATM are good examples where timing issues are very important).

Seen from the perspective of customer edge equipment (CE), a PW appears to be an unshared link or a circuit for some designated service. PWs provide a relatively straightforward mechanism to implement arbitrary services across packet-switched networks, and to achieve interoperability among arbitrary sets of equipment from multiple vendors.

This was last updated in February 2008
Posted by: Margaret Rouse

Email Alerts

Register now to receive SearchNetworking.com-related news, tips and more, delivered to your inbox.
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

More News and Tutorials

Do you have something to add to this definition? Let us know.

Send your comments to techterms@whatis.com

There are Comments. Add yours.

 
TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: