Cisco ONS 15454 SDH Specifications Page 241

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Glossary
GL-11
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
IP
(Internet Protocol). Network layer protocol in the TCP/IP stack offering a connectionless internetwork service. IP provides
features for addressing, type-of-service specification, fragmentation and reassembly, and security.
IPPM
Intermediate-Path Performance Monitoring.
IP address
32-bit address assigned to host using TCP/IP. An IP address belongs to one of five classes (A, B, C, D, or E) and is written as
4 octets separated by periods (dotted decimal format). Each address consists of a network number, an optional subnetwork
number, and a host number.
ITU-T
International Telecommunication Union - Telecommunication Standards Sector.
J
JRE
Java Runtime Environment.
K
K bytes
Automatic protection-switching bytes located in the SONET line overhead and monitored by equipment for an indication to
switch to protection.
L
LAN
(Local Area Network). High-speed, low error data network covering a relatively small geographic area. LANs connect
workstations, peripherals, terminals, and other devices in a single building or other geographically limited area. Ethernet,
FDDI, and Token Ring are widely used LAN technologies.
LCD
(Liquid Crystal Display). An alphanumeric display using liquid crystal sealed between two pieces of glass. LCDs conserve
electricity.
LDCC
Line Data Communication Channel.
Line layer
Refers to the segment between two SONET devices in the circuit. The line layer deals with SONET payload transport, and its
functions include multiplexing and synchronization. Sometimes called a maintenance span.
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