Encore 24 PORTS NWAY SWITCHING HUB User's Guide Page 178

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G-4 Encore Multi-port DSU/CSU User GuideÑJuly, 1997
G
clear channel
A characteristic of a transmission path or digital circuit in which the full
bandwidth is available to the user. The phone company does not use any
portion of the bandwidth for framing or control bits.
clock
An oscillator-generated signal providing a timing reference for a transmission
link; used to control timing functions such as sampling interval, signaling rate
and duration of signal elements.
code conversion
The process of changing the bit grouping for a character in one code into the
corresponding bit grouping for the character in another.
CMI (Control Mode Idle)
The process of changing the grouping for a character in one code into the
corresponding bit grouping for the character in another.
communications port (Comm Port)
The electrical interface between a unit and the operatorÕs terminal. Operator
commands and responses can be communicated through the Comm Port.
connector
A physical interface, such as DB-15 or RS-232-C, typically with male or female
components.
CPE (Customer Premises Equipment)
Equipment that interfaces the telephone network and physically resides at the
user's location.
CRC (Cyclic Redundancy Check)
An error checking scheme used to check the received data. The CRC bits
within the framing are calculated using the contents of the frame. The
calculation is performed again when the frame is received and the CRC values
are compared. If they do not match, the frame is considered bad and the CRC
statistic is incremental. Performance checking is done by both the carrier and
the customer without causing any interference with the T-1 trafÞc.
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