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List of terms
Nortel Multiservice Switch 7400/15000/20000
Terminology
NN10600-005 7.2S1 Standard
PCR7.2 and up March 2006
Copyright © 2006, Nortel Nortel Confidential
DTL originator
The first lowest-level node within the entire PNNI routing domain to build the
initial DTL stack for a given connection.
DTL terminator
The last lowest-level node within the entire PNNI routing domain to process
the connection (and thus the DTL for the connection).
DTMF
See dual tone multi-frequency (DTMF) (page 45)
dual-bus mode
A configuration in which both backplane buses are available to carry cells
between operational cards.
dual fabric mode
A configuration in which both backplane fabric cards are available to carry
cells between operational cards.
dual-FP line APS
A type of implementation scheme that uses two optical interface cards to
provide SONET or SDH line automatic protection switching. Dual-FP APS
allows equipment sparing for optical interface cards.
See automatic protection switching (APS) (page 15).
dual leaky bucket
See inverse-UPC shaping (page 68).
dual tone multi-frequency (DTMF)
A signalling method that uses specific pairs of frequencies within the voice
band for signals.
dynamic generic cell rate algorithm (DGCRA)
A version of the GCRA. DGCRA uses information supplied by ABR.
dynamic packet routing system (DPRS)
A connectionless routing system for delay-sensitive and high-throughput
variable bit rate traffic. DPRS carries data traffic such as frame relay and all
DPN-100 services such as X.25.
E1
The 2.048 Mbit/s interface defined in ITU-T G.703. Usually consists of a
framed pattern of thirty-two 64 kbit/s time slots.