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Voyager Reference Guide 681
IPSO
Nokia (Ipsilon) Router Operating System. An UNIX-like operating system
based on FreeBSD that runs Nokia's firewalls in conjunction with Check
Point's FireWall-1 software.
IPSRD
Nokia (Ipsilon) Software Routing Daemon. Nokia software that computes
routes using resident-database information, which is configured and
maintained by Nokia's Voyager. A
daemon is a dormant, background process
(in a UNIX environment) that waits to perform tasks.
ISDN
Integrated Digital Service Network. The recommendation published by
CCITT for private or public digital telephone networks where binary data,
such as graphics and digitized voice and data transmission, pass over the same
digital network that carries most telephone transmissions today. ISDN
provides 128 kbits bi-directional data capacity.
LAPB
Link Access Procedure, Balanced. Derived from HDLC, a CCITT X.25
version of a bit-oriented data link protocol.
LLC
Logical Link Control. The upper portion of the datalink layer, as defined in
IEEE 802.2. The LLC sublayer presents a uniform interface to the user of the
datalink service, usually the network layer.
LMI
Local Management Interface. In frame relay, a specification that defines a
method of exchanging status information between devices such as routers.