Enabling Quadlink Loop Through; Port-Paired Loop Through Assignments - Telestream Lightspeed Live Capture User Manual

Enabling QuadLink Loop Through

QuadLink Loop Through Video Input is available only on servers equipped with an 8-
port 3G SDI card.
Note: QuadLink Loop Through is not supported on servers equipped with the HEVC
(H/W) card.
C5 Lightspeed Live servers have 8 permanent input and 8 permanent output SDI
ports; loop-through is permanently enabled and can't be changed.
Configuring an SDI source with QuadLink Loop Through causes the server to route the
SDI source back out—or loop through—a paired SDI port, in addition to using the signal
as a source. This can be used, for example, as confidence monitoring of the SDI signal
into the server. QuadLink Loop Through can be enabled on SDI 1 or SDI 5.
Important Note: SDI-1 input is used as the master sync when QuadLink Loop
Through Video Input is enabled. All source inputs MUST be of the same baseband
video type (frame rate and frame size) and they MUST share a common video
reference that is frame synced and gen-locked together. Failure to meet this
requirement results in a vertical offset being introduced in the sources.
If the source video type (such as frame rate or frame size) changes on SDI1 when
operating in QuadLink Loop Through mode, the other inputs fail and go to LOS (loss of
signal). After SDI1/5 is set back to match the other inputs, changing a setting on a
source and saving it resets the source back into operation.
When you enable QuadLink Loop Through for a given SDI source, the paired SDI source
for the output is automatically deleted without warning—because it is now an output
on the paired SDI port. For example, you set [host] - SDI 1 to loop through to SDI 5;
Source Manager deletes the source instance of [host] - SDI 5. The previous source is
unavailable to any Capture action or stream channel that was set to use that source.
SDI-1 automatically goes to SDI-2 and SDI-3 goes to SDI-4 and the source cards auto-
populate correctly. See

Port-Paired Loop Through Assignments

The following pairings apply when configuring SDI input ports for Loop Through:
For Servers with Four 3G SDI Ports
•
SD/HD:
– SDI-1 is paired with SDI-3
– SDI-2 is paired with SDI-4
•
UHD/4K:
– No Loop Through
Lightspeed Live Capture User Guide
Port-Paired Loop Through Assignments
Managing Video Sources
Enabling QuadLink Loop Through
for more information.
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