... (standalone)----Multi-optical Access Platform SDH-155M Mstp 1. IntroductionThis series take SDH technology as the core, and have the function of ... and the various private network. The standalone SDH is quite flexible, STM-1/STM-4 SDH, 155M/622M double optical ports backup ... , and has four kinds of subsidiary card to be selected, Ethernet, V.35, EOS and E1 card. The customers can choose ...