80 MN.00273.E - 004
ment has a reliability of 0.3 ppm over 24 h. When the SIAE equipment switches to internal clock, it prop-
agates a quality of SEC – SDH Equipment Clock.
7.11 PROVIDE SYNCHRONISM TO EXTERNAL EQUIPMENT
Once the SIAE equipment is synchronized, the clock signal has to be passed toward external equipment or
other SIAE equipment. SIAE equipment can give the synchronization signal through different interfaces.
Fig.31 - Provide synchronism
The interfaces that are available to provide synchronization to other SIAE or external equipment are:
• Radio: this interface is passing the synchronism automatically to the remote equipment. No config-
uration is needed.
• GE Interfaces: the TX CK of the all GE lines (i.e. LAN 1 and 2) is locked to the SETS. In this way,
the CK can be passed through these connections to other equipment provided that they support
Synchronous Ethernet. The GE Interfaces when used in Electrical can provide the CK signal to other
equipment: in this case the equipment port role must be “Master”. Once the synchronization is en-
abled in the SIAE equipment, automatically all the LAN interfaces are locked onto the SETS. This
implies that the synchronization signal is automatically provided onto all the LAN interfaces.
The choices of the interface to pass the clock signal depend strictly on the external equipment. This means
that in first place it is necessary to establish the possible sources of synchronization available on the ex-
ternal equipment. Depending on the availability of these sources, SIAE equipment will be configured with
the correspondent interface to pass the clock signal.
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