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The Cisco ISM-SRE-300-K9 is a member of the ISR 3900 Series of routers and related products. The Cisco ISR 3900 Series routers offer high performance and services density. The SIR 3900 Series routers use a Cisco SPE to offer additional features. A number of SPE's are available.
Cisco ISM-SRE-300-K9: 512MB DRAM, 4GB flash storage.
Cisco ISM-SRE-300-K9 ISR 3900 Series Router Services Ready Engine
Cisco PWR-3900-AC/2 ISR 3900 Series 400W AC Router Power Supply
Cisco SM-SRE-710-K9 1x 1GB RJ-45 1x USB Services-Ready Engine