Huahuan
Beijing Huahuan Electronics Co., Ltd.
H0EL-EthMux V8 User Manual V1.1
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In the figure, a pair of H0EL-EthMux V8s create transparent E1 channels over
the packet network, providing connections between the PBX and telephone exchange,
or other terminal devices. At the same time, computers talk to each other through the
local Ethernet ports on the H0EL-EthMux V8’s. This configuration guarantees that
the E1 channels get higher priority over computer data for maximum QoS.
The most widely used application of H0EL-EthMux V8 is to set up point to
point wireless E1 links using low cost wireless LAN bridges. H0EL-EthMux V8 can
work with most LAN bridges on the market. It may be necessary to adjust different
parameters such as packet size and packet jitter absorption buffer size for best
operation for different LAN bridges.
Be aware that wireless LAN bridges have a very limited bandwidth. If Ethernet
data is to be transferred at the same time, its traffic must be restricted. Otherwise it
will affect the E1 packets. Since the LAN bridges usually don’t have adequate QoS
mechanism to guarantee the E1 priority, it is strongly recommended that the data
traffic be routed through the H0EL-EthMux V8 local data port, as depicted in Fig.
1.3-2.
Fig. 1.3-2 preferred connections for LAN traffic
WARNING
: When connecting to a wireless LAN bridge, the uplink
Ethernet cable often connects to the outdoor unit, posing danger to lightning
strikes that can seriously damage the equipment. To protect the equipment as
well as people, surge protection devices with good earth connection is strongly
recommended. Poor earth connection may also hinder the operation of the
Ethernet port, causing severe packet losses.
1.4
Timing modes
To emulate a clear E1 channel over a packet network, the H0EL-EthMux V8 not
only conveys data stream content correctly from the source to the destination, but
also passes timing. Packet networks do not provide such built-in timing transparency
mechanism as TDM networks do. H0EL-EthMux V8 uses its proprietary algorithm
to reconstruct the E1 clock at the destination. The recovered clock is of very high
quality, with low jitter and wander. Typical frequency offset is within
5ppm, and
jitter is below 0.1UI. It can be adopted in most applications. This timing mode of
Summary of Contents for H0EL-EthMux V8
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