Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1992-05-08
1994-04-12
Shaw, Dale M.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
34082505, 370 855, H04L 1242
Patent
active
053033876
ABSTRACT:
An arrangement whereby a passive line concentrator (100) can be connected in a managed token ring network includes a special concentrator port (200) in an active concentrator (10) which is adapted to have inserted the ring-in port (130) of the passive line concentrator. The special concentrator port of the active concentrator supplies a small phantom current to the passive concentrator, which returns the phantom current only if it has at least one active port. Detection of the returned phantom current controls insertion of the special concentrator port into the network.
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Babu Kalampukattussery C.
Kumar Hemant K. R.
Matz Bret A.
Millard Steven J.
Faller Fran
Shaw Dale M.
The Whitaker Corporation
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