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Maintenance Signaling

 

When normal traffic cannot be transmitted from a port, for example, when a received signal is in a failed state or when a port is administratively disabled and traffic is disrupted, the BTI7800 Series will usually forward a maintenance signal from the transmit port to indicate to the downstream node that a local outage exists. For all interface protocols, the default maintenance signal (Table 1) enables the receiving node to conclude that the link to the adjacent upstream node is intact.

Table 1: Default Maintenance Signals - Interface Protocols

Protocol

Default Maintenance Signal

OTN OTU

ODU-AIS

OTN ODU

ODU-AIS

Ethernet

LF

OC192, WAN PHY over OC192

AIS–L

STM64, WAN PHY over STM64

MS-AIS