DiGiCo SD Rack - Manual (Page 11)

SD Rack
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1.6.7 Optocore ID & Fibre Speed .................................................
These pages show the Optocore ID of the rack in range of 11 to 24 and the fibre speed which is either 1GB or 2 GB.
Each rack requires a unique ID so that it can be recognised by the rest of the Optocore system. To change the ID, scroll with the Left/
Right buttons until you reach the required number.
The rack fibre speed needs to be set to the same value as all other devices in the Optocore system. The Default is 2GB and this should
not be changed unless you have special requirements. There are two possible reasons to change the fibre speed to 1GB:
1) If you require distances of optical fibre greater than 350M between individual devices.
2) You require compatibility with Optocore's own I/O units, some of which will only operate at the 1GB fibre speed. Please consult your
Optocore device documentation for the fibre speed specifications.
NOTE: Using a fibre speed of 1GB will restrict the system's Optocore fibre channel count to 224 I/O at 96KHz.
1.6.8 USB Rack Control ................................................................
This page allows selection of which rack component can be addressed by the rack USB port.
When set to Opto >, the internal Optocore board can be addressed for the reprogramming of Optocore firmware - this is not required
unless under specific instruction from your distributor or DiGiCo Support.
When set to < Rack, the general rack control system can be addressed - this feature is not yet implemented (Nov 2010).
The Default setting is < Rack.
1.6.9 Rack Sync Source ................................................................
This page allows selection of the rack sync source.
The Default setting is which allows automatic sync selection in the order selecetd in the Rack Sync order page where the default
setting is WMXO as detailed in Main Display above.
This setting can be manually overridden and a specific sync source can be set as either:
= Internal sync - Rack is Master
= External Word Clock sync - Word Clock input is Master
= MADI Main sync - MADI Main input is Master
= MADI Aux sync - MADI Aux input is Master
= Optocore sync - Optocore is Master (normally the lowest numbered Optocore ID on the system)
1.6.10 Rack Sync Order ................................................................
This page allows selection of the rack sync priority order when the the Rack Sync setting is AUTO.
The Default setting is WMXO> which allows automatic selection of sync order priority to Word Clock, Main MADI, Aux MADI and finally
Optocore.
This means that if a valid Word Clock is present at the Word Clock input, the rack will sync to that and if not present the rack will look for a
valid sync on the MADI Ports. If that is also not present, sync will be derived from Optocore.
This setting can be manually overridden and a specific sync priority order can be set as any of the combinations in the picture below
where:
W = Word Clock
M = Main MADI
X = Aux MADI
O = Optocore