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The MEM-4551 acts as a gateway between an
Ethernet network and an ASI environment.
The MEM-4551 generates an ETR-290 compliant ASI
transport stream, with a settable Program Number
identifier, at a fixed settable data rate. When
Ethernet data is available to send it is encapsulated
into ASI packets. When there is no Ethernet data
available, NULL packets are used to stuff the ASI
stream to the selected rate.
On the receive side packets containing Ethernet data
are extracted from the ASI stream by reference to the
assigned Program Number.
The MEM-4551 acts as an Ethernet bridge. A
dynamic MAC address table is formed over time,
which allows filtering of the Ethernet packets being
forwarded through the ASI link.
The Ethernet port is set up automatically to accomodate most network environments. The ASI output rate is switch selectable to operate at a payload data rate of between 1Mb/s and 108Mb/s.
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The Ethernet port has automatic MDI/MDI-X
detection. This detects whether the Ethernet
interconnect cable is a straight through or cross over
type and automatically switches itself to
accommodate.
The output ASI stream is suitable for transfer by any
ASI type of signal path, such as IRT's ASI single and
MUX fibre link cards. Also G.703 rates are available on the output to cooperate with ASI-G.703 products. For full duplex action a return
link is required.
An optional SNMP (Simple Network Management
Protocol) plug in module is available for remote
monitoring and control when used in conjunction
with IRT's 4000 series frame fitted with SNMP
capability. The MEM-4551 is designed to fit IRT's standard Eurocard frames as well as IRT's 4000 series frame for use with IRT's SNMP system and may be used alongside any other of IRT's analogue or digital Eurocards.
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