Cisco ONS 15327 User Documentation page 530

Glossary
G
GBIC
Gigabit Interface Converter. A hot-swappable input/output device that plugs into a Gigabit Ethernet port to link the port with
the fiber optic network.
H
Hard reset
The physical removal and insertion of a card.
HDLC
High Level Data Link Control. Bit-oriented, synchronous, data-link layer protocol developed by ISO. HDLC specifies a data
encapsulation method on synchronous serial links using frame characters and checksums.
Host number
Part of IP address used to address an individual host within the network or subnetwork.
Hot swap
The process of replacing a failed component while the rest of the system continues to function normally.
Hub
1. Hardware or software device that contains multiple independent but connected modules of network and internetwork
equipment. Hubs can be active (where they repeat signals sent through them) or passive (where they do not repeat, but merely
split, signals sent through them).
2. In Ethernet and IEEE 802.3, an Ethernet multiport repeater, sometimes called a concentrator.
I
Input alarms
Used for external sensors such as open doors, temperature sensors, flood sensors, and other environmental conditions.
Interface
1. Connection between two systems or devices.
2. In routing terminology, a network connection.
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.
Cisco ONS 15327 User Documentation, R3.3
GL-6
June 2002