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List of terms
bundle
Grouping of one or more physical links using the formats and procedures of the multilink frame relay (MLFR) standards. The bundle operates as a logical interface function that emulates a single physical interface to the Q.922 data link layer.
bundle link
A multilink frame relay (MLFR)
burst tolerance (BT)
A characteristic of ATM usage parameter control applied to traffic defined through traffic descriptor types 6, 7, and 8, and is based primarily on the MBS value defined in parameter 3 for each of these types. BT is defined as MBS minus 1 multiplied by the difference between the PCR and SCR cell intervals. BT, together with SCR and the GCRA, determines the MBS that can be transmitted at the PCR.
bus
The Nortel Multiservice Switch node bus.
bus control system (BCS)
The software system that manages the operation of the Nortel Multiservice Switch node bus.
bus controller (BC)
A Nortel Multiservice Switch ASIC that allows a processor card to send and receive data and to control information over a backplane bus. There are two bus controllers for each processor card, one for each 800 Mbit/s bus.
bus mode
A property of a Nortel Multiservice Switch node that indicates the number of backplane buses that are currently in service (for example,
bus tap
The interface between a processor card and the backplane bus. The bus tap consists of a bus controller ASIC and some additional backplane interface logic. There are two bus taps for each processor card.
bus terminator card
A printed circuit board that terminates backplane traces, thereby reducing errors on the backplane buses by eliminating signal reflection. Each shelf contains two bus terminator cards, one at each end of the backplane.
Nortel Multiservice Switch 7400/15000/20000
Terminology
PCR7.2 and up March 2006
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