Channel Associated Signaling (CAS), also known as Per-Trunk Signaling (PTS), is a form of digital communication signaling. As with most telecommunication signaling methods, it uses routing information to direct the payload of voice or data to its destination. With CAS signaling, this routing information is encoded and transmitted in the same channel as the payload itself. This information can be transmitted in the same band (in-band signalling) or a separate band (out-of-band signalling) to the payload.
CAS potentially results in lower available bandwidth for the payload. For example, in the PSTN the use of out-of-band signalling within a fixed bandwidth reduces a 64 kbit/s DS0 to 56 kbit/s. Because of this, and the inherent security benefits of separating the control lines from the payload, most current telecom systems rely more on Common Channel Signaling.
The most common implementation of CAS is robbed bit signaling.
 |
This article related to telecommunications is a stub. You can help Wikipedia by expanding it. |
 |
This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (January 2008) |
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
