ADTRAN Cable T1 ESF CSU ACE User Manual

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T1 ESF CSU ACE Appendix D. Glossary61204025L1-1B © 2004 ADTRAN, Inc 61DTEdata terminal equipment. The end-user terminal or computer that plugs into the termination point (DCE) of acommunications circuit. The main difference between the DCE and the DTE is that pins two and three arereversed.encapsulationA process by which an interface device places an end device’s protocol-specific frames inside a frame relyframe. The network accepts only frames formatted specifically for frame relay; therefore interface devices act-ing as interfaces to a frame relay network must perform encapsulation. See also interface device or frame relaycapable interface device.end deviceThe ultimate source or destination of data flowing through a frame relay network sometimes referred to asDTE. As a source device, it sends data to an interface device for encapsulation in a frame relay frame. As a des-tination device, it receives de-encapsulated data (i.e., the frame relay frame is stripped off, leaving only theuser’s data) from the interface device.FCSframe check sequence. The standard 16-bit cyclic redundancy check used for HDLC and frame relay frames.The FCS detects bit errors occurring in the bits of the frame between the opening flag and the FCS, and is onlyeffective in detecting errors in frames no larger than 4096 octets. See also CRC.FDLfacility data link. A 4 bit/s non-disruptive management channel provided in ESF framing mode. This data linkconforms to ANSI T1.403 and AT&T TR 54016 specifications.FECNforward explicit congestion notification. A bit set by a frame relay network to notify an interface device (DTE)that congestion avoidance procedures should be initiated by the receiving device. See also BECN.file serverIn the context of frame relay network supporting LAN-to-LAN communications, a device connecting a seriesof workstations within a given LAN. The device performs error recover and flow control functions as well asend-to-end acknowledgment of data during data transfer, thereby significantly reducing overhead within theframe relay network.frame-relay-capable interface deviceA communications device that performs encapsulation. Frame-relay-capable routers and bridges are examplesof interface devices used to interface the customer’s equipment to frame relay network. See also interfacedevice and encapsulation.frame relay frameA variable-length unit of data, in frame-relay format that is transmitted through a frame relay network as puredata. Contrast with packet. See also Q.922A.frame relay networkA telecommunications network based on frame relay technology. Data is multiplexed. Contrast with packetswitching network.