Lucent Technologies LambdaUnite Installation Manual page 334

Intermediate System (IS)
A system which routes/relays management information. An SDH Network Element may be a
combined intermediate and end system.
IS (In-Service)
A memory administrative state for ports. IS refers to a port that is fully monitored and alarmed.
IS-IS Routing
The Network Elements in a management network, route packets (data) between each other using
an IS-IS level protocol. The size of a network running IS-IS Level 1 is limited, and therefore
certain mechanisms are employed to facilitate the management of larger networks.
For STATIC ROUTING, the capability exists for disabling the protocol over the LAN
connections, effectively causing the management network to be partitioned into separate IS-IS
Level 1 areas. In order for the network management system to communicate with a specific
Network Element in one of these areas, the network management system must identify through
which so-called Gateway Network Element this specific Network Element is connected to the
LAN. All packets to this specific Network Element are routed directly to the Gateway Network
Element by the network management system, before being re-routed (if necessary) within the
Level 1 area.
For DYNAMIC ROUTING an IS-IS Level 2 routing protocol is used allowing a number of
Level 1 areas to interwork. The Network Elements which connect an IS-IS area to another area
are set to run the IS-IS Level 2 protocol within the Network Element and on the connection
between other Network Elements. Packets can now be routed between IS-IS areas and the
network management system does not have to identify the Gateway Network Elements.
ISDN
Integrated Services Digital Network
ITM
Integrated Transport Management
ITM-NM
Integrated Transport Management Network Module
ITU
International Telecommunication Union (formally known as CCITT)
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J Jitter
Short term variations of amplitude and frequency components of a digital signal from their ideal
position in time.
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K kbit/s
Kilobits per second
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G L O S S A R Y
G L - 1 8
Lucent Technologies 365-374-059
Issue a, January 2002