Cambium Networks PTP 820 Series User Manual page 513

Chapter 9: TDM Services and Interfaces
Table 98 E1/DS1 Interface Configuration Parameters
Parameter
Admin
Timing Mode
Absolute Clock Reference
Recovery Clock Source
Reference Port
TDM Signal Line Type
Definition
Select Enable to enable the port or Disable to disable the port.
Select the clock reference for the outgoing TDM signal from the port.
Options are:
•
Loop – The output signal uses the clock of the incoming E1/DS1 lines.
If you select Loop, you must select the clock source reference in the
Recovery Clock Source Reference Port field. By default, each port will
take itself as a reference.
•
Absolute – All ports are synchronized to a single common clock,
which you select in the Absolute Clock Reference field.
•
Clock Recovery – Adaptive Clock Recovery. Clock information is
recovered on the egress path. Extra information may be located in an
RTP header that can be used to correct frequency offsets.
If you select Clock Recovery, you must select the clock source reference
in the Recovery Clock Source Reference Port field.
If Timing Mode is set to Absolute, select 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:
o
An E1/DS1 line, or
o
A Digital 2.048MHz/1.544MHz input
•
System Reference Clock
If Timing Mode is set to Loop or Clock Recovery, select None.
If Timing Mode is set to Loop or Clock Recovery, select the clock source
reference for the port. Options are 1-16.
By default, each port will take itself as a reference. Select a different port
only if more than 16 clock domains are being used.
If Timing Mode is set to Absolute, this field must be set to 0.
Select the line type of this port. Options are:
•
Unframed
•
E1 (reserved for future use)
•
E1-CRC (reserved for future use)
•
E1-MF (reserved for future use)
•
E1-MF-CRC (reserved for future use)
•
DS1-D4 (reserved for future use)
•
DS1-ESF (reserved for future use)
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Configuring the E1/DS1 Interface