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However, two-wire circuits can also be used for full-duplex communication by partitioning the available bandwidth into separate frequency bands for each direction of transmission (derived four-wire). This technique is often utilized when a full-duplex data communications circuit is desired over dial-up (two-wire) facilities. On the other hand, the existence of four-wire circuits does not necessarily imply that full-duplex transmission can be achieved through simultaneous use of both pairs. Very longdistance circuits require echo suppressers that effectively disable one pair of a four-wire circuit while the other pair is in use.

544 Mbps. Often, T1 frames are combined into larger structures called SuperFrames (12 frames) and Extended-SuperFrames (24 frames). “Robbing bits” from the interior frames can then transmit additional signaling. Basic T1 and E1 interfaces emulate a collection of analog voice trunks and use robbed bit signaling to transfer supervisory information similar to the E&M analog model. As such, each channel carries its own signaling, and the interface is called channel-associated signaling (CAS). A more efficient method uses a common signaling channel for all the voice channels.

However, VoATM suffers from the burden of additional complexity, and incomplete support and interoperability among vendors. It also tends to be more expensive because it is oriented toward all-optical networks. Most importantly, ATM is typically deployed as a WAN Layer 2 protocol and therefore does not extend all the way to the desktop. Nevertheless, ATM is quite effective for providing trunking and tandem switching services between existing voice switches and PBXs. Voice over Frame Relay (VoFR) has become widely deployed across many networks.

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