Appeal No. 1998-2435
Application No. 08/516,216
channels of digital information down a fibre optic
cable 12 in Sonet frames to an outside box (OF) 16
.... The outside box 16 receives the information
from cable 12, converts it to electrical signals,
strips off and processes the Sonet control channels
from the Sonet frame, and broadcasts the information
along corresponding twisted pairs of copper wires 18
leading to the various subscribers.
Thus, Look removes the information from the Sonet frame before
transmitting signals over the twisted pairs rather than
transmitting the information over the twisted pairs using the
Sonet frame format.
The examiner asserts (Answer, page 4) that it would have
been obvious to transmit using the Sonet format in view of
Look's disclosure that the twisted pairs permit frequencies up
to 100Mhz to be transmitted. In particular, the examiner
states (Answer, page 4) that "[o]ne skilled in the art would
have no difficulty using SONET frame format, in Look's system,
between the outside box and the set to terminals at the
subscriber site if it is desired, especially since Look et al
teaches that the twisted pair can support the SONET speed and
timing."
We are not convinced by the examiner's line of reasoning.
First, Look explicitly teaches eliminating the Sonet format
4
Page: Previous 1 2 3 4 5 6 7 8 Next
Last modified: November 3, 2007