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The DMM-4880 and DMX-4880 are part of a family of network adapters for converting between STM-1 and STM-4 formats.
With the DMM-4880 up
to four 155 Mb/s STM-1 signals can be multiplexed together and converted
into a single 622 Mb/s STM‑4 optical NRZ signal.
Inputs are automatically equalised for lengths of up to 200m of Belden 8281 or equivalent
cable.
Front panel indications on the DMM-4880 multiplexer shows if valid STM-1 signals are present.
Optional STM-4 reference input for synchronizing to STM-4 network, if required. |
The DMX-4880 separates the 622 Mb/s STM-4 signal back into the original four 155 Mb/s STM-1 signals.
Front panel indications on the DMX-4880 de-multiplexer shows if valid encoded STM-1 signals are present.
SNMP (Simple Network Management Protocol) is available for monitoring and control when used in an IRT frame fitted with SNMP capability.
The DMM-4880 and DMX-4880 are designed to fit IRT's standard Eurocard frames and may be used
alongside any other of IRT's analogue or digital Eurocards.
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