Control circuit for IEEE 1394b optical transmission protocol

Details Control circuit for IEEE 1394b optical transmission protocol Control circuit for IEEE 1394b optical transmission protocol

2006-07-18

2006-07-18

Healy, Brian (Department: 2883)

Optical waveguides

Integrated optical circuit

C398S022000, C398S133000, C398S134000, C398S135000, C398S136000, C398S137000, C398S138000, C398S139000, C327S073000, C327S205000

Reexamination Certificate

active

07079717

ABSTRACT:
An On-Off control circuit between the IEEE1394a and IEEE1394b compliant physical layer (PHY) output driver circuitry and the glass fiber optical physical medium dependent (PMD) sub-layer within the architecture of the IEEE 1394b standard addresses the stability issue incurred by electronic circuit's inherent noise that interferes with the connection detecting procedure defined by the connection management protocol (CMP) of the IEEE 1394b standard. The circuit includes of a voltage divider to provide a reference voltage of about 50% of the output common mode voltage, a voltage comparator, and a feedback coupled to the positive input of the comparator to eliminate possible oscillation. The negative input of the comparator may be connected to the mid point of TPB termination network and the positive input of the comparator may be connected to the output of the voltage dividing circuit. The output of the comparator may be connected to the transmission enable bar input of the optical transceiver. In the process of connection detection, the common mode voltage of the TPB output toggles between 0 volt and 1.5 volt. Thus, the changing of the common mode voltage of TPB output driver circuitry will switch the optical transmitter on and off at a proper time to meet with the input signal definition requirements at the peer node according to the IEEE1394b standard.

REFERENCES:
patent: 6047199 (2000-04-01), DeMarco
patent: 6226045 (2001-05-01), Vidovich
patent: 6369555 (2002-04-01), Rincon-Mora
patent: 6411068 (2002-06-01), Willis
patent: 2001/0036227 (2001-11-01), Matsuo et al.
patent: 2002/0027688 (2002-03-01), Stephenson
patent: 2004/0151198 (2004-08-01), Brown et al.
patent: 2004/0250174 (2004-12-01), Sterrantino et al.

Affiliated with

Also associated with

Rating

Control circuit for IEEE 1394b optical transmission protocol does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Control circuit for IEEE 1394b optical transmission protocol, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control circuit for IEEE 1394b optical transmission protocol will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3547236