Glossary
GL-21
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
TDM
time division multiplexing.
The process of combining several communication channels by dividing a channel into time increments
and assigning each channel to a timeslot.
time division
multiplexing
See
TDM.
timestamp
A field in certain FastPacket formats that indicates the amount of time the packet has spent waiting in
queues during the transmission between its source and destination nodes. Used to control the delay
experienced by the packet.
Trm
An upper bound on the time between RM cells for an active source, i.e., RM cell must be sent at least
once every Trm msec.
transient buffer
exposure
See
TBE.
trunk
A physical link between two nodes. The trunk may be one that supports 24-byte FastPackets (packet
trunk), or one that supports 53 byte ATM cells (cell trunk.)
trunk conditioning
A set of signaling and information bits that indicate a DS1 line failure.
trunk queues
The buffers in packet line cards (NTC, TXR) where the various FastPackets are queued up for
transmission over the packet line(s). The buffers attempt to prioritize each packet so it experiences
minimum delay.
U
µ
-law
An analog to digital encoding scheme used to convert voice samples to an 8-bit data word used in
D3/D4 T1 multiplex equipment.
UBR
unspecified bit rate.
QoS class defined by the ATM Forum for ATM networks. UBR allows any amount of data up to a
specified maximum to be sent across the network, but there are no guarantees in terms of cell loss rate
and delay.
UNI
user-to-network interface.
The user to network interface, used for ATM connection to CPE. Compare with NNI. The protocol at
a frame relay port that passes information between the network and the user device attached to the
port.
universal
synchronous/
asynchronous
receiver transmitter
See
USART.
unspecified bit rate.
See
UBR.
UPC
usage parameter control.
A general procedure for controlling the rate of user data applied to an ATM network. There are a
number of different algorithms for performing UPC. See also GCRA.
Summary of Contents for BPX 8650
Page 49: ...P A R T 1 The BPX Switch ...
Page 50: ......
Page 159: ...P A R T 2 Installation ...
Page 160: ......
Page 273: ...P A R T 3 Initial Configuration and Network Management ...
Page 274: ......
Page 311: ...P A R T 4 Configuring Connections ...
Page 312: ......
Page 487: ...P A R T 5 Troubleshooting and Maintenance ...
Page 488: ......
Page 533: ...P A R T 6 BPX Specifications ...
Page 534: ......
Page 555: ...P A R T 7 Appendices ...
Page 556: ......