Westermo ID-90 - Manual (Page 113)

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Buffer
A memory for storing data for a short time, e.g. until the receiver is ready.
Byte
A quantum of data consisting of 8-bits. I.e. an ASCII character which consists of 7–8 data
bits can be stored in a byte.
CLIP
Calling Line Identification Presentation.
CLIR
Calling Line Identification Restriction.
Called party number
The number to which the call is made.
Calling party number
The number from which the call is initiated.
CODEC
An assembly comprising an encoder and decoder in the same equipment.
CTS
Clear To Send. Hardware handshake by DCE in response to an RTS signal.
Data Rate
In modems this is often different to the baud rate. For instance the Data Rate of V.32bis is
14 400 bit/s and the baud is 2 400 symbols/second.
DCD
Data Carrier Detect. A signal from the DCE showing that a carrier is present and a line is
ready for data transmission.
DCE
Data Communication Equipment. Like a Terminal adapter, Modem, protocol converter or
line driver.
DIN rail
Deutsche Industri Norme standard mounting for the installation of equipment in an appa-
ratus cubicle.
D-Channel
16kbit/s at BRA. A D-channel is primarily intended to carry signalling information for circuit
switching by the ISDN.
A D-channel uses a layered protocol according to Recommendations I.440, I.441, I.450 and
I.451. In particular the link access procedure is frame oriented (Note).
In “Idle” state the D-cannel is transmitting binary 1:s.
The D-cannel bits are not echoed from NT to TE, collision is detected throug the “echo-bit”.