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Quartz Q256-SV System Manual
MANUAL-08
Multi-rack Systems
Very large routers can be built by combining at least one standard Q256 router with expand and/or cascade
Q256 routers. These are connected using high speed, high-density multi-core cables similar to computer
SCSI cables.
Multi-rack routers are built from 4 basic chassis types, designated A, B, C, and D frames.
Router Type (A, B, C, or D)
Input Fin Type
Output Fin Type
Q256-SV-256256-A
BNC Input Fin
BNC Output Fin
Q256-SV-256256-B
BNC Input Fin
Cascade Fin
Q256-SV-256256-C
Expand Fin
BNC Output Fin
Q256-SV-256256-D
Expand Fin
Cascade Fin
From these four basic router types it is possible to build a 1024x1024 router.
Inputs 1-256
Inputs 257-512
Inputs 513-768
Inputs 769-1024
Outputs 1-256
Q256-SV-256256-A Q256-SV-256256-B
Q256-SV-256256-B
Q256-SV-256256-B
Outputs 257-512
Q256-SV-256256-C
Q256-SV-256256-D
Q256-SV-256256-D
Q256-SV-256256-D
Outputs 513-768
Q256-SV-256256-C
Q256-SV-256256-D
Q256-SV-256256-D
Q256-SV-256256-D
Outputs 769-1024
Q256-SV-256256-C
Q256-SV-256256-D
Q256-SV-256256-D
Q256-SV-256256-D
Signal Monitoring
In a multi-frame system where signal monitoring is required every output rack must be fitted with the Q256-
SV-SM signal-monitoring module. Other frames can be fitted with the module when sophisticated fault
analysis is required.
The O/P Mon Out of the last frame is connected to the O/P Mon In of the next frame, and this is repeated
until the first frame, where the O/P Mon Out is connected to a signal monitor and/or picture monitor.
The I/P Mon Out cannot be cascaded as above and so is only useable in single frame installations or where
manual connection is a suitable working practice.
Connecting The Inter-Rack Cables
The SCSI expansion connectors carry video signals in an internal differential format and are only used when
expanding outside a single chassis system. The input fin SCSI connector feeds buffered versions of the
BNC input signals on to other frames in the system to ‘Expand’ the outputs. The output fin SCSI connector
takes a routed input signal from other routers to ‘Cascade’ the higher numbered inputs.
The Inter-Rack Cables which connect the 'Expand' Outputs to the 'Expand' Inputs, and the ‘Cascade’
Outputs to the ‘Cascade’ Inputs are provided by Quartz in a Standard 2.5 Metre length, part AK-0013.
Because of the cable length, the racks should be closely located, either directly above one another, or side
by side in adjacent rack frames (with no obstruction between rack frames so cables can run directly between
routers).
Warning:
The cable connectors are relatively fragile and should be handled with care. The cables
must be adequately supported so that no more that 0.5m of cable are hanging on the
connector. Avoid straining the cables.
Issue 1.72
edited: 26 Sept 2005
Page 24
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