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Please specify your question about 4-port OC3/STM1 SM IOA with APS: provides (4 = 4 active + 4 standby) OC3/STM1 single mode LC full duplex physical ports. Supports distances up to 15 kilometers. Works with the ERX-OCXA256M-MOD, OC3/OC12-ATM, and OC3/OC12-POS line modules. Requires JUNOSe *