Telos TWOx12 - Page 205

TELOS TWOX12 USER’S MANUAL
GLOSSARY OF TELEPHONE TERMINOLOGY
APPENDIX 4 193
IMUX
– See Inverse Multiplexing
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
break up of AT&T. With the current state of deregulation, the RBOCs are slowly re-
entering this business.
Interexchange Carrier
- See IEC
Inverse multiplexing
- A method of combining and later separating 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 128kbps or less 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. See BRI.
ISDN 30
- A term used in Europe for ISDN PRI. See PRI.
ISG
– Incoming Service Grouping. See Hunt Group
IXC
- IntereXchange Carrier- See IEC
Kbps
- KiloBits Per Second. Measure of digital channel capacity.
Key Telephone System
– A system that allows multiple telephones to share multiple
pre-determined telephone lines. The system provides indicators to allow the user’s to
understand the status of each line available on a given phone. It is up to the user to
provide the intelligence to select an unused line, or answer a ringing line, for example.
See also PBX.
LATA
- Local Access and Transport Area. The area within which calls are routed by
your Local Exchange Carrier (LEC). Under the divestiture of the Bell System calls
going outside of this area must be handled by an Interexchange carrier (IEC). With the