CPE 155 is the Customer Premises Equipment from C-DOT at STM-1 rate. It has been designed for application in the BSNL/MTNL and/or other networks for extension of the 2 Mbps and Ethernet leased services to the customer premises. It is a low profile, cost-optimized and under equipped SDH equipment at STM-1 line rate (optical) that has pre-specified fixed configuration to reduce the overall cost.