Table of Contents
Advertisement
I/O, Clocking, and Reference
Clock Reference
Because the LA-5300 offers very flexible signal routing and supports multiple input and output formats, having a
firm grasp of the clock sync (reference) requirements is critical.
Clock Reference Requirements
Sample Rate Converters (SRCs) are provided on both SDI inputs, the SDI 1 output, and the AES-3 input. The
AES-3 output is always synced to the active reference clock. There are no SRCs in the AES67 path.
Reference clock source options include:
Internal 48kHz
♦
SDI Input
♦
AES-3 Input
♦
MADI Input (when optional MADI card is present)
♦
PTP (AES67)
♦
When all input sources are SDI and the output of the processor is routed to the embedded SDI output, the refer-
ence signal present on the SDI input must be used.
When using AES-3 I/O, the LA-5300 can be referenced to either the AES-3 clock (using the SRCs in the SDI path)
or to the SDI clock (using the SRCs in the AES-3 path.
When using an AES-3 source without an accompanying reference, the LA-5300's 48kHz internal clock can be used
as the system reference if necessary, providing the SRC on the AES-3 input is enabled.
Whenever AES67 audio is used either on the input, the output, or both, the LA-5300 must be slaved to an external-
ly-generated PTP clock as it cannot generate its own PTP reference.
Note:
The LA-5300 is set to operate in slave mode by default. There are controls in the Sync/ QoS sub-menu of the
System menu to change this should the ability to operate as a clock master be introduced in future software
versions, but only Slave Only mode is currently supported.
Chapter 5 | 22
Advertisement
Table of Contents
