... carrier card. The Cisco 1-, 2-, and 4-Port OC-48c/STM-16c POS/RPR SPAs use Small Form-Factor Pluggable ... , SONET/SDH, PPP, Spatial Reuse Protocol (SRP), RPR, POSLine RateOC-48c/STM-16cStatus IndicatorsPort status, statusExpansion / ConnectivityExpansion Slot(s)1 (total ...