Beijing Huahuan Electronics H0EL-EthMux V8, Руководство пользователя

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Huahuan
Beijing Huahuan Electronics Co., Ltd.
H0EL-EthMux V8 User Manual V1.1 - 5-
master slave
loop back adaptive
adaptive adaptive
slave master
adaptive loop back
adaptive adaptive
slave slave Not allowed
Note that setting both units to adaptive timing mode works well for all the conditions,
although the other option may work better.
2.

System architecture
2.1 Block diagram
The internal functional structure of H0EL-EthMux V8 is depicted below:
Fig. 2.1-1 Functional diagram
2.2 Description
The heart of H0EL-EthMux V8 is the TDM/Packet processing unit. It
truncates E1 data stream, putting the data into Ethernet packet with or without IP
headers. The packets are passed to the Ethernet switch unit via MII interface, and
are sent out adaptive the uplink ports. Ethernet data from two local data port are
also sent out through the uplink ports, but with lower priority than those packets
containing E1 data.
In the reverse direction, packets from the uplink ports are sorted at the switch
unit. All but E1 packets are passed to the local data ports. The packets containing
E1 data are sent to the TDM/Packet processing unit for reassembling the original
data stream, and recovering the E1 clock which is the key element of the device.
Very sophisticated algorithm is used to ensure that the reconstructed clock will meet
the stringent requirement of TDM applications. The most important parameters are
jitter, wander, and signal delay.
The control unit interfaces with the user through console port so that various
operational parameters can be modified.