E-8 Cisco BPX 8600 Series Reference
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.)
