Grass Valley Profile XP Service Manual - Manual (Page 165)

Audio interface
23 July 2004 Profile XP Service Manual 165
Audio interface
The audio interface receives external analog or AES/EBU digital audio signals and
converts them into the internal form used by the Audio board. The audio interface also
receives data from the audio processor and converts it to the appropriate external
audio signal.
Audio
The Audio board receives PCM audio from either an audio interface or from the SDI
boards after routing through the video/audio crosspoint fabric. The Audio board is
responsible for the physical I/O, algorithmic processing, and distribution of sixteen
channels of uncompressed PCM audio. In its simplest form it does simple processing
of the audio and level monitoring or level adjust. It may also be used to do more
complex functions such as EQ, channel mixing, or scrub audio processing.
Time code I/O
Provides the physical interface to time code I/O signals. It extracts and decodes this
signal on inputs and generates and inserts this signal on outputs. The time code I/O
functionality is generally combined with video I/O or RefGen modules. The time code
data is read or written by the RTP via the PCI bus.
Media storage subsystem
The media storage subsystem is where the video, audio, time code, and other media
related data is stored. This storage system consists of one or more RAID units that are
connected to the Profile XP platform by one or more Fibre Channel links.
Fibre Channel disk interface
The fibre channel disk interface consists of a dual port Fibre Channel Disk board for
connecting the Profile XP system to the external Fibre Channel RAID storage system
in either a local or centralized storage configuration. In local storage configurations,
the Fibre Channel RAID storage system is connected directly to the Fibre Channel
Disk board. In centralized storage configurations, this board is connected to a Fibre
Channel switch fabric to provide access to a centralized pool of Fibre Channel RAID
storage systems.
When the RAID storage systems are configured with an optional second controller
board, Port B of the Fibre Channel Disk board can be connected to provide a
redundant path to the disks.The dual connection to the Fibre Channel RAID chassis
allows instant and seamless failover in the event of a failure of one of the interfaces
on the board, or of one of the RAID Controller boards in the RAID chassis.
On older Fibre Channel Disk boards, both ports use a copper Gigabit Link Module
(GLM) for copper Fibre Channel cables, which support up to 1Gb/s transfer speeds.
Current Fibre Channel Disk II boards use removable Small Form-factor Pluggable
interfaces (SFPs),. Optical SFPs support up to 2Gb/s transfers when connected to
compatible devices. Copper SFPs limit transfers to 1Gb/s.