OTS-155B SDH has the following features:

•  Conforms to the correlative proposal of ITU-T and related SDH technical criteria of the country.

•  Full time slot cross connect functions, having powerful, convenient Add and Drop traffic functions and modes.

•  Compliant system design: The equipment can configure either TM (Terminal Multiplexer) or ADM (Add Drop Multiplexer) mode flexibly.

• Offers system configuration for STM-1 with the methods of easy upgrading and reconfiguring networks.

• Provides multi-type tributary interfaces with excellent cost performance.

• Offers perfect network management system; flexible network configuration.

• Realizes a number of traffic protection modes.

• Provides multi-function orderwire telephone system.

• Offers electromagnetic compatibility performances (EMC and EMI) with appropriate measures.

• Well maintained; high-reliable operation.

• Pizza box type appearance.