Grass Valley PDR 200 Installation - Manual (Page 28)

Chapter 1 Introduction
1-16 Profile Video File Server Installation
You can select the video data rate the Profile system uses to record the video signal,
unless you are using DVCPRO25 codecs which operate at a fixed 25Mb/s. When
selecting video data rates, be sure not to exceed the total Profile system bandwidth.
Fibre channel transfers, archive operations, and high bandwidth recording or playout
may require that you reduce the data rate on other channels or operate fewer channels
at one time. Although playout and recording take priority over other operations,
exceeding your Profile system bandwidth may result in record or playback problems.
For information on setting the video data rate in Profile applications software, refer to
the appropriate sections of the Profile Family User Manual
Storage Capacity Estimates
The Profile Video File Server storage capacity is determined by the number of disk
drives in the system and the video data rate selected to record the video signal. The
Profile Video File Server can be configured with three, five, or eight internal 18GB
disk drives. You can refer to Table 1-10 for storage estimates based on the number of
disk drives installed and the video data rate. All Profile applications allow you to
select the video data rate used to record the video signal, unless you are using
DVCPRO 25 compression which operates at a fixed 25Mb/s data rate, or
DVCPRO 50 compression which operates at a fixed 50Mb/s data rate. For more
information about setting the video data rate, refer the appropriate sections of the
Profile Family User Manual.
Video storage times are estimates (within 10%) and include 2 audio channels and 1 timecode channel.
Adding 2 more channels of audio adds approximately 1.5 Mb/s to the total data rate.
The Profile Video File Server storage space can be expanded by adding one or two
PDX 218 Disk Expansion Chassis containing eight 18GB disk drives each. You can
refer to entries for eight drive systems in Table 1-10 to determine the storage capacity
of a PDX218 at various video data rates.
NOTE: Storage capacity estimates for the PRS 255 RAID Storage Chassis are
located in the PRS255 RAID Storage Instruction Manual.
Table 1-10. Profile Video File Server Storage Capacity Estimates
Number of
Internal
Drives JPEG Factory Preset
Data Rate Targets
MPEG-2 Factory Preset
Data Rate Targets
DVCPRO 25
Data Rate
48Mb/s 24Mb/s 24Mb/s 15Mb/s 8Mb/s 25Mb/s
100KB/fld 50KB/fld 102KB/frm 66KB/frm 37KB/frm 120KB/frm 525/60
120KB/fld 60KB/fld 123KB/frm 78KB/frm 41KB/frm 144KB/frm 625/50
3 disks 2 hrs 4 hrs 4 hrs 6.1 hrs 10.2 hrs not available
5 disks 3.5 hrs 6.5 hrs 6.5 hrs 10.2 hrs 17 hrs not available
8 disks 5.5 hrs 10.5 hrs 10.5 hrs 16.3 hrs 27.2 hrs 9