Line Interface Couplers (LICs)
There are six types of LIC, namely:
LIC1, LIC3, LIC4A
and LIC4B for attaching:
– Local direct-attached DTEs (not attached through DCEs)
– Remote DTEs attached via stand-alone DCEs and telecommunication
facilities.
An internal clock function (ICF) is available on these LICs to provide clocking
signals to nonclocked DTEs or DCEs (see Appendix A for details).
LIC5
and LIC6, both housing integrated DCEs, providing direct access to the
telecommunication facilities for attaching remote terminals.
The clocking of lines attached to these LICs is provided by the integrated DCEs
(see Appendix A for details).
LIC Weights
The weight of a line is a value (0.4 through 100) that represents the percentage of
scanner occupation. The weight of a line depends on its speed (bps), the protocol
(SS, BSC, SDLC), the mode of transmission (HDX, FDX), and the characters code
(ASCII,
EBCDIC, ...). The total weight of active lines connected to a scanner must be
equal to or less than 100.
LIC User Access
User access to LICs eases upgrading of the 3745 and repair in case of failure. Hot
pluggability allows plugging and unplugging when the 3745 is in operation. Thus,
LIC replacement, addition, or removal does not disturb the scanner nor impair the
network.
Then, the LICs have been designed to accept snap-on cables: this allows quick
cable attachment of telecommunication lines.
Chapter 4. Controller Description
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