| Overview: |
The British Telecom standard consists
primarily of two documents. The first document
SIN 227 describes the technical aspects of the
Caller Display Service (CDS). Included in this is
the physical layer characteristics along with the
alert signals and V.23 data signals
specifications. Also described in SIN 227 is the Calling
Line Identification Presentation (CLIP) message
structure. This entails the message format,
message timing, requirements for CLIP parameters,
message length, and examples of the message
structure.
The second
document SIN 242 outlines the requirements of the
terminal equipment (TE). This includes the
signaling requirements for both the physical and
data link layer, operation of the terminal
equipment in terms of its network interface, and
a series of electrical and signaling tests.
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