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Production of the M4 (PSM-2100) Series Modems including the PSM-2100, 1500, 512 and 2100L have all been discontinued. There are still many thousands of these modems operating faithfully in the field, and we almost never see any returned for repair, attesting to their robust design and manufacture. The newer M5 Series of Modems (PSM-4900x) completely replace all of the capabilities of the M4 series at a lower cost. They also offer many new innovative features. Data, including the full original manuals (see Documents) for the M4 series are still maintained here for your use. |
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