Layer

Directionality

Module

OTSↆ

Unidirectional

ESAM (Enhanced Service Access  Module) Ports Line A/B In or OUT

OMSↆ

Unidirectional

ESAM (Enhanced Service Access  Module) Ports Line A/B In or OUT

OTSi Level1ↆ

Unidirectional

CMD64 (Channel Mux/Demux) Port Optical input / output from the

client-side interface(s)

OTSi Level2ↆ

Unidirectional

MOTR (Filter and aggregation) Port Transmit & Receive

OTSi Level3ↆ

Bidirectional

Multi Path Link

MOTR (Filter and aggregation) Port Transmit & Receive

OTU4ↆ

Bidirectional

MOTR (Filter and aggregation) Port Transmit & Receive

ODU4ↆ

Bidirectional

MOTR (Filter and aggregation) Port Transmit & Receive

OTU2ↆ

Bidirectional

MOTR (Filter and aggregation) Port Transmit & Receive

ODU2ↆ

Bidirectional

MOTR (Filter and aggregation) Port Transmit & Receive

ETHERNET

Bidirectional

MOTR (Filter and aggregation) Port Transmit & Receive