Glossary
20
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
T
T1
The standard US. multiplexed 24-channel voice/data digital span line. Operates at a data rate of 1.544
Mbps.
T3
Transmission service at DS3 rate of 44.736 Mbps.
TBE (Transient
Buffer Exposure)
The negotiated number of cells that the network would prefer to limit the source to send during the
start-up period.
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.
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.
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 signalling 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.
UNI (User to
Network Interface)
The user to network interface, used for ATM connection to CPE. Compare with NNI.
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.
USART (Universal
Synchronous/Async
hronous Receiver
Transmitter)
A single-chip device used in certain applications that allows microprocessors to communicate with
input/output (I/O) devices.
User to Network
Interface (UNI)
The protocol at a frame relay port that passes information between the network and the user device
attached to the port.
Содержание BPX 8600 Series
Страница 43: ...P A R T 1 The BPX Switch ...
Страница 44: ......
Страница 151: ...P A R T 2 Installation ...
Страница 152: ......
Страница 261: ...P A R T 3 Initial Configuration and Network Management ...
Страница 262: ......
Страница 291: ...P A R T 4 Configuring Connections ...
Страница 292: ......
Страница 481: ...P A R T 5 Troubleshooting and Maintenance ...
Страница 482: ......
Страница 531: ...P A R T 6 BPX Specifications ...
Страница 532: ......
Страница 563: ...P A R T 7 Appendices ...
Страница 564: ......
Страница 624: ...Glossary 24 Cisco BPX 8600 Series Installation and Configuration Release 9 3 0 Part Number 78 10674 01 Rev D0 July 2001 ...
Страница 630: ...Index 6 Cisco BPX 8600 Series Installation and Configuration Release 9 3 0 Part Number 78 10674 01 Rev D0 July 2001 ...