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6.
BASEBAND CHARACTERISTICS
The E1/T1 signals and Ethernet traffic are mapped in to a scalable frame for transport towards the ODU.
This frame has in addition to the main traffic two 64 kb/s service channels for user traffic. Ethernet traffic
is scaleable in steps of E1s or T1s.
6.1.
User Interfaces
The IFU can be equipped with the following interface units:
•
12xE1 and 25xE1
•
8xT1 and 16xT1
•
64 kb/s Serial Channel Unit
•
EOW Unit (Service channel)
•
Alarm and Control Unit
•
SDH/SONET DXC Unit
•
155 Mb/s electrical or optical interface
6.2.
Ethernet functionality
6.2.1.
General
One of the Ethernet ports at the SU is used for user traffic. The interface is 10/100BASE-TX. The
Ethernet traffic can be mixed with TDM traffic and is scaleable in steps of E1s or T1s
6.2.2.
Ethernet Traffic Mapping
Ethernet traffic is mapped into E1s or T1s using a proprietary method
6.2.3.
Flow Control
Ethernet Flow Control can be enabled/disabled.
6.2.4.
MAC learning
MAC-learning can be enabled/disabled. MAC-table aging is configurable.
6.2.5.
Link-Loss Failure pass through on the Ethernet port
Evolution Series supports a Link-Loss Failure pass through, LLF. This is useful for routers or switches to
detect that the Ethernet connection has failed or there is no pass through connection through the radio link
side. The LLF function is based on the principle that the interface on the opposite side will be
disconnected when the link on the Ethernet port or the radio link has failed. Hence, a failure situation will
be communicated to either ends in the link configuration.
When there is a radio link failure, the LLF function will control the Ethernet link on the opposite side of
the radio link by the link status on each side. I.e. if the incoming Ethernet signal on one side is
disconnected, the output on the Ethernet port on the opposite side will be turned off.
36
Evolution Series - XPAND
.
.
NGP\00329 Rev. C 23-06-2006
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