Grass Valley PDR 200 Service Manual - Manual (Page 37)

Fibre Channel
PDR200 Service Manual 3-5
Fibre Channel
Fibre Channel describes the physical interface connection which provides for the high
speed transfer of large amounts of data between Profiles. The Fibre Channel
implementation in Profile is an EISA board, which uses the Fibre Channel Arbitrated
Loop protocol and an on-board Gigabaud Link Module for the functionality to
network numerous Profiles.
Video enters the Fibre Channel board through the rear panel connector and transfers
to the EDR(s) over a high speed PCI local bus. The EDR(s) then control transfer of
compressed/decompressed digitized video to the SCSI bus and media disks. This
transfer is independent of the video CODECs. If the video system requires more
bandwidth, the Fibre Channel board slows down to accommodate video.
Audio Recording System
The PDR200 supports AES/EBU digital, analog, and embedded audio formats. The
Audio Signal Processing Board (ASPB), standard on the Profile, handles 16 channels
(8 pairs) of AES/EBU digital audio. The PAC208 adds the capability of 8 channels of
analog audio and the PAC216 (which includes an Expansion chassis) brings Profile
ability to process analog audio up to 16 channels.
The MEDR moves audio data over the EISA bus and assigns it to available hard disk
space over the SCSI bus. The audio signal is not compressed. During play back, audio
is recovered from the hard disks and routed back onto the EISA bus. The associated
Video Input provides a clock signal to maintain synchronization.
The system processor controls Audio operations in much the same manner that it
controls the video record and play operations through the EISA bus.