Based on STM-1. Conforms to the correlative proposal of ITU-T and related SDH technical criteria of the country.  Offers various types of traffic interfaces such as PDH, SDH and Fast Ethernet with flexible network configurations of linear, ring, multiple rings.
Providing E1, Optical interface, V.35 interface, all of the unit cards can be hotswapped.

All of the unit cards  are removable and support hot-swap and the configuration are available through the assemblage of the common modules