Cisco BPX-BXM-155-8DX Installation And Configuration Manual page 615

N
A redundancy method in which a group of cards share the same standby redundant card.
n+1 redundancy
The protocol at a frame relay port that serves as a bidirectional interface between a local Cisco WAN
Network-to-Networ
k Interface (NNI) switching network and a separate and independent "other" network.
An IGX or BPX switch serving as a connection point to the network. At a node, connections from
node
service lines are routed to trunks for transmission to other nodes in the network.
Micro-processor based system controller front card that contains the software used to operate the IGX
NPM (Network
Processor Module) switch.
Maximum number of cells a source may send for each forward RM cell, that is, an RM cell must be
Nrm
sent for every Nrm-1 data cells.
IGX front card that coordinates fastpacket trunk traffic to another node via a number of backcards:
NTM (Network
Trunk Module) T1, E1, Y1, and subrate (RS449, X.21, and V.35).
O
Standard optical transmission facility rate of 155.20 Mbps.
OC-3
In the United States, reference to all the other telecommunications companies providing various
OCC (Other
Common Carrier) transmission services other than AT&T.
P
Packet line referred to a line used to carry FastPackets between nodes in a network. The term in these
packet line
documents is replaced by the more general "trunk" which is defined as a physical link from node to
node, node to shelf, or node to network. The trunk may be one that supports 24-byte FastPackets
(packet trunk), or one that supports 53 byte ATM cells (cell trunk).
A system that breaks data strings into small units (packets), then individually addresses and routes
packet switching
them through the network.
A device that converts a serial data stream into discrete packets in the transmit direction and converts
PAD (Packet
Assembler/Disasse the received packets back into a serial data stream. Adds header information in the transmit packet to
mbler) allow it to be routed to the proper destination.
One control lead in each direction, generally RTS-CTS, is transmitted in same byte as seven data bits.
partially-interleaved
EIA For fast control lead response to data being turned on and off.
Digital or analog telephone switchboard, classified as customer premise equipment (CPE), used to
PBX (private branch
exchange) connect private and public telephone networks.
The system for transmitting telephone signals digitally. Voice is sampled 8000 times per second and
PCM (Pulse Code
Modulation) converted to an 8-bit digital word.
The maximum rate for an ATM connection at which cells are allowed into the network.
PCR (Peak Cell Rate)
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Cisco BPX 8600 Series Installation and Configuration
Glossary
15