ESI VideoBridge 2150, Service Manual

Page: 273 / 332

A.2.3
Number of Devices
The IEEE- 4 8 B bus c a n handle up t o 15 device s . More than 15 d e vices
can be in terf a ced if they a re no t direc tly c onnec ted to the bus but
a re in terf a ced through ano ther device . At lea s t two- thir d s of the
main devices c onnec ted t o the bus a t any time mu s t be p owered up f o r
the s y s tem t o be opera tional .
A.2.4 Cable Length
The maxim um c a b le leng t h tha t c a n be u s ed t o c o nne c t a gr o u p of
devices within one bus s y s tem is:
2 me t e r s times the number of device s , or 20 me ter s, whi chever is
les s .
Ca bles ma y be in terc onnec ted in either s ta r or linea r c onfigu r a tion,
or in any combina tion of the two me tho d s ( s ee Figure A-5 ) .
Figure A-5.
IEEE-48 8 Bus Interconnection Configurations
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l
s
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i
A - 14
2150 /2160 5 /B5