Optical communications – Multiplex – Optical local area network
Reexamination Certificate
2004-12-15
2010-06-15
Wang, Quan-Zhen (Department: 2613)
Optical communications
Multiplex
Optical local area network
C398S004000
Reexamination Certificate
active
07738789
ABSTRACT:
A radio base station has a baseband unit (BB) and multiple RF heads (RH1, RH2), which are interconnected by means of a bi-directional two-fiber optical ring (R). Each RF head (RH1, RH2) has a delay counter (31) for determining a propagation delay (tL) on the ring (R) and a variable delay circuit (16, 26) for compensating a difference between the propagation delay on the ring and a predefined target delay (tRR). The delay counter counts (31) the delay between a test signal sent on the first fiber (F1) of the ring to the baseband unit and a received test signal looped back by the baseband unit on the second fiber (F2) of the ring.
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patent: 6687236 (2004-02-01), Goldstein
patent: 6744764 (2004-06-01), Bigdeliazari et al.
patent: 2002/0075906 (2002-06-01), Cole et al.
patent: 2003/0188233 (2003-10-01), Lubbers et al.
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CPRI Specification V1.0 “Common Public Radio Interface (CPRI); Interface Specification” Sep. 30, 2003; pp. 1-54.
Lange Keld
Sulzberger Uwe
Evolium S.A.S.
Sughrue & Mion, PLLC
Wang Quan-Zhen
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