Telos Zephyr Xstream - Manual (Page 365)

USER’S MANUAL
Appendix 10 – Glossary 353
IGMP (Internet Group Management Protocol) is a communications protocol used to manage
the membership of Internet Protocol multicast groups. IGMP is used by IP hosts and adjacent
multicast routers to establish multicast group memberships. IGMP is used by Livewire
TM
to
manage multicast audio streams.
ILEC – Incumbent Local Exchange Carrier A local Exchange Carrier which entered the
marketplace before the enactment of the 1996 Telecom act;. i.e. a telephone company which is
neither an Indi nor an RBOC. See LEC and CLEC.
IMUX See Inverse Multiplexing
In Band Signaling A signaling system where network information such as address and routing
information are handled over the communications (voice) path itself. Usually the information is
represented in the form of audible tones, however DC loop current signaling also qualifies as In
Band Signaling. See also CCIS.
Incumbent Local Exchange Carrier See ILEC. See also CLEC & LEC
Independent Any of the phone companies in existence at the time of divestiture that were not
affiliated with the Bell System. See RBOC, LEC, and CLEC.
Indi See Independent.
Interconnect Company A vendor of telecommunications CPE other than a BOC or AT&T. This
term was originated by AT&T and was meant to be derisive towards the fledgling industry when
the courts said it was OK for end users to buy equipment from someone other than the Bell
System. This industry flourished, in spite of AT&T’s disdain, and ironically, the RBOCs were not
allowed to sell CPE under the terms of the breakup of AT&T. With the current state of
deregulation, the RBOCs are slowly re‐entering this business.
Interexchange Carrier See IEC
Interwork The ability of two different type of networks to communicate seamlessly. For
example, ISDN can interwork calls to both the POTS network and the Switched‐ 56 network.
Inverse multiplexing A method of breaking apart and later combining 2 data streams that does
not involve the telephone network. Inverse multiplexing is the most common way of achieving
this function in Codecs operating at 112 or 128kbps over ISDN.
IOC Capability Packages ISDN Ordering Code system. This system was devised by the National
ISDN User’s Forum and Bellcore to simplify ordering new ISDN lines in the USA and Canada.
Using a single code specifies all line specifications. The Telos Zephyr, ZephyrExpress, TWO, and
TWOx12 support IOC package “S”. Search for document NIUF 428‐ 94 at NIUF’s web page
http://www.niuf.nist.gov/ for more information.
ISDN Integrated Services Digital Network‐ A relatively new and highly flexible type of telephone
service which allows dialing on digital channels with multiple bi‐ directional “Bearer” channels
each with a capacity of 56 or 64 Kbps and a single bi‐ directional “D channel”. See BRI and PRI.
ISDN Protocol The “language” used for communication between the Telco’s switch and the
customer’s Terminal Adapter. Each ISDN circuit has one protocol, and the protocol has no effect
on where or whom one may call. See ETS 300, National ISDN, and Custom ISDN.
ISDN 2 A term used in Europe for ISDN BRI. Also called S׎. Not to be confused with National
ISDN‐ 2. See BRI.