14
Installation PTN-4-2/4WEM
Release 01 02/2018
Table 7
Clocking Parameters on Port & Service Level
Port A:
Clock
Source
Port B:
Clock Source
Port1
Port C:
Clock Source
Port1
Port D:
Clock
Source
Description
Synchronized
‘No Clock'
‘Internal Clock’
‘Adaptive/
Differential’
‘No Clock'
Node (B) transmits packets to node (C) based on
an Internal Clock. This clock is delivered by the
local oscillator on the IFM. Node (C) recovers
the clock from the incoming packet stream from
the network and uses it to encode/decode data
streams.
All the ports of an IFM in ‘adaptive’ mode
(→port1=’adaptive’) operate as a slave.
‘No Clock'
‘Internal Clock’
+ SyncE
‘Internal Clock’
+ SyncE
‘No Clock'
Both nodes (B) and (C) encode/decode the data
stream to/from the end applications based on
the ‘Internal Clock’ on the IFM. This clock is
delivered by the CSM and is based on a PRC
delivered via SyncE.
Unsynchronized
‘No Clock'
‘Internal Clock’
‘Internal Clock’
‘No Clock'
Both nodes (B) and (C) encode/decode the data
stream to/from the end applications based on
the ‘Internal Clock’ on the IFM. This Internal
clock is delivered by the local oscillator on the
IFM.
The service will be stable 15s after the service
startup. Though, the clocks of both sides are not
synchronized. Sooner or later, one of the
transmit buffers will overflow or run dry,
resulting in a reset of the buffers. This reset will
cause a minimal loss of data.
NOTE:
SyncE: See the manuals in Ref.[1] and Ref.[4] for more detailed information;
2.2.9
Selftest: Tone Generation/Level Metering
Selftests can be performed via test tone generation/level metering in CESes, e.g. when
configuring or troubleshooting a CES.
CAUTION: enabling selftests disables or disturbs normal service traffic on a port!
For more information and configuration settings, see 'Test and Loopback' in Ref.[1] in
Table 1.
