Cisco Systems 8600 Series DSI Digital Speech Interpolation, DTE Data Terminal Equipment, Fast EIA

DSI (Digital Speech Interpolation)

An algorithm that analyzes DS0 voice bits for non-speech codes. Suppresses these bits to conserve packet line bandwidth and inserts a code to indicate to the far end that these bits have been removed. Similar to DFM for data channels. Also, referred to as VAD (Voice Activity Detection).

DTE (Data Terminal Equipment)

As defined by the RS-232 standard, any device that generates or utilizes information. (See also, DCE.)

E

E1

European transmission service at the rate of 2.048 Mbps.

E3

Transmission service at a rate of 34.368 Mbps.

ECN (Explicit Congestion Notification)

A frame relay feature to signal the onset of network congestion to external devices. Sets FECN and BECN bits in frame relay header to indicate forward and backward congestion.

F

Fast EIA

Same as interleaved EIA. Seven data circuit control leads in each direction are transmitted in alternating bytes with data. For fast control lead response to data being turned on and off but with a sacrifice in packet line bandwidth.

FBTC (Frame Based Traffic Control)

An AAL5 frame based traffic control that provides the possibility of discarding the whole frame, not just one compliant cell. This avoids wasting bandwidth by continuing to send the cells in a frame once a cell has been found to be non-compliant.

FGCRA (Frame Based Generic Cell Rate Algorithm)

An enhancement option to GCRA that allows an entire frame to be discarded if any of its cells are non-compliant, rather than transmitting a partial frame over the network.

flat network

A non-structured network, a network in which there are no junction nodes or domains.

foreign network

An adjacent network that is owned and managed by a different party than the one that owns the local network.

ForeSight

A proprietary optional feature that uses feedback techniques to dynamically allocate extra bandwidth to frame relay and ATM connections when the network bandwidth is available and not used by other connections. (See also VSVD.)

E-8Cisco BPX 8600 Series Reference