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Glossary of Terms
50003510 Revision A 233
Class of Service (COS)
A class of service has a number of different feature options assigned to it. A class of service
can be allotted to one or many stations, and enables these stations to have, or be denied,
features which are available within the SX-200 EL/ML system. Up to 50 classes of service are
available which allow a large number of different groups of station users to be programmed,
each with differing feature characteristics.
CODEC
The COder-DECoder is a device used in digital switching and transmission systems, for coding
analog signals (voice signals) into a digital format for onward transmission, and decoding a
digital transmission to recover the original analog signal.
CODEC/Filter
The CODEC/Filter chip used in the SX-200 EL/ML system consists of a CODEC, a filter and
other elements. It forms part of the peripheral card, with the CODEC portion performing the
necessary A/D and D/A functions and the filter portion providing low–pass filtering for the line
transmission.
Consultation Hold (Soft Hold)
A form of temporary hold. It is used to put a second party on hold while the first party is speaking
(consulting) with a third party, or wants to temporarily isolate the second party from
conversation.
Control Dual FIM Carrier Card
The card supports up to two Fiber Interfaces Module and connects them to the backplane. It
has a 1 km FIM onboard and a connector to plug in a second optional FIM (either a 1 km FIM
or an extended FIM).
Control Triple FIM Carrier Card
The card supports up to three Fiber Interface Modules and connects them to the backplane. It
has two 1 km FIMs onboard and a connector to plug in a third optional FIM (either a 1 km FIM
or an extended FIM).
Control Over Voice
Control over voice is used by the voice mail system to perform most of its signaling functions.
A 32 kHz carrier signal is modulated according to the control function, and is transmitted to or
from the voice mail system on the same pair of wires used for the audio connection. The carrier
frequency lies above the normal audio range of the voice mail system and is therefore inaudible
to the user.