Cambium Networks PTP 820 Series, User Manual, Page: 967 / 1149

Chapter 21: TDM Services and Interfaces (CLI) Configuring TDM Cards and Interfaces (CLI)
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Page 21-6
Parameter Input Type Permitted Values Description
timing-mode Variable loop
absolute
clock-recovery The clock reference for the outgoing TDM signal
from the port. Options are:
loop
– The output signal uses the clock of the
incoming lines. By default, each port is its will
take itself as a reference.
absolute – All ports are synchronized to a
single common clock, as defined by the clk-src-ref
parameter.
clock-recovery
– Adaptive Clock Recovery.
Clock information is included in the TDM data
stream at the point where the data is frameized.
Extra information may be located in an RTP
header that can be used to correct frequency
offsets. The clock information is extracted at the
point where the frames are received and
reconverted to TDM. The extracted clock
information is used for the reconversion to TDM.
If you configure the
timing-mode
as
clock-
recovery
, you must use the clk-src-ref-port
parameter to configure the clock source
reference port.
clk-src-ref Variable none
front-panel
sys-ref-clk If
timing-mode
is set to
absolute
, use this
parameter to configure the clock source
reference for the port. Options are:
front-panel – An external clock reference
from a dedicated front panel clock interface. This
can be:
An E1/DS1 line, or
A Digital 2.048MHz/1.544MHz input
sys-ref-clk
– Clock is taken from the system
reference clock defined for the entire unit.
If the timing-mode parameter is set to loop or
clock-recovery , set this parameter to none .