IBM ThinkPad 130, Introduction Manual, Page: 79 / 104

Appendix A. Data Clocking
This appendix provides clocking considerations for properly operating:
Ÿ Low-speed scanners with low/medium-speed lines
Ÿ High-speed scanners with high-speed lines.
Data Clocking for Low-Speed Scanners
An internal clock function (ICF), associated with each LIC, provides the transmit
and receive clocks to:
Ÿ
The LICs and low-speed nonclocked DCEs
Ÿ Only the LICs, when their direct-attached DTEs use their own clock
Ÿ
The LICs and their direct-attached nonclocked DTEs.
| Note: A 3725, 3720, or 3745 model 210, 310, 410, or 610 may be locally attached
to a 3745-130/150/170 low-speed scanner as for any other DTE at speeds up to
245 760 kbps, via LIC type 3 or 4B.
The ICF is not used when a LIC is attached to a clocked DCE. Depending on the
above configurations, the ICF mode can be Internal, 3745, or External, and the
clockings are provided as follows:
INTERNAL Mode
Speed Selection : By SSP at generation time
NCP Parameters : CLOCKING=INT, SPEED=xxx
Speeds:
1. Asynchronous lines (Start-Stop)
50, 75, 100, 110, 134.5, 200, 300, 600, 1200, 2400, 4800, 9600, and 19 200
bps.
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Copyright IBM Corp. 1989, 1991
A-1