t indicates that the amount of reserved
bandwidth on a ringlet exceeds the available LINK_RATE.
When an excess reserved rate defect is present,
a notification may be generated.

g, to detect the connection, a kind of packet
is send between neighbor RPR nodes, This kind of packet 
is SC(Single-Choke) packet, If a node cannot receive SC 
packet from neighbor node in KEEPALIVE time, then there 
is failure between the two nodes. When happened, auto protection 
is executed by software.!

g, to detect the connection, a kind of packet
is send between neighbor RPR nodes, This kind of packet 
is SC(Single-Choke) packet, If a node cannot receive SC 
packet from neighbor node in KEEPALIVE time, then there 
is failure between the two nodes. When failure is resumed
 , this notification is sent.!

ber is connected in error. i.e the east direction 
of one node is connected with east direction of another node, 
or the west direction of one node is connected with west direction 
of another node!

mena that Optical fiber is connected in error disappears,
this notification is sent!

RPR operating mode, east and west directions 
of one rpr node lay on two RPR cards, These two cards are 
internally conntected by Gigaibit-ethernet, which is called 
MATE interface. The RPR nodes cannot work normaly under 
condition of MATE error.!

RPR operating mode, east and west directions 
of one rpr node lay on two RPR cards, These two cards are 
internally conntected by Gigaibit-ethernet, which is called 
MATE interface. The RPR nodes cannot work normaly under 
condition of MATE error.when MATE error is resumed ,this 
notification is sent!

sical layer, link connection is detected 
through physical singal. When can't receive physical
 singal, then local node from neighbor node, LOS(lost of signal) 
 alarm is report, auto protection is executed by software.!

sical layer, link connection is detected 
through physical singal. When can't receive physical
singal, then local node from neighbor node, LOS(lost of signal) 
alarm is report, auto protection is executed by software.when LOS
is resumed,this notification is sent

 severity defect that indicates the presence
of mismatched-protection-configuration stations, based
on the value returned by MismatchedProtection().
When a protection configuration defect is present
on the station, a notification may be generated.

opology change is present,
a notification may be generated..

 severity defect indicating that an
invalid entry has been found within the scope
of the topology,the stations on the ring excess
the MAX_STATIONS or the local station has one
or more duplicate secondary MAC addresses. When
a topology entry invalid defect ,exceeing MaxStations
or  duplicate secondary MAC addresses is present,
a notification may be generated.

 severity defect indicating that a
duplicateMacAddress has been found on the ring.
When a duplicateMacAddress defect is present,
a notification may be generated.

al severity Instable topology defect.
When an Instable topology defect is present,
a notification may be generated.

al severity Instable topology restore.
When an stable topology  is present,
a notification may be generated.

al severity physical interface defect.
When an physical interface  defect is present,
a notification may be generated.

al severity Logic interface defect.
When an logic interface  defect that caused
by physical interface event is present,
a notification may be generated.