185
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Ethernet
unidirectional; Ethernet is defined as Organization Specific Slow Protocol (OSSP).
SSM represents the quality level of the system clocks located in the network. Background (or heartbeat) is sent
once per second as keep alive. ESMC information PDU- event message is sent immediately in case the clock
quality level has changed. ESMC event PDU- failure condition is declared if no message is received in 5
seconds.
ESMC PDU Format
Octet number Size
Field
1-6
6 octets
Destination address = 01-80-C2-00-00-02
7-12
6 octets
Source address
13-14
2 octets
Slow protocol Ethertype = 88-09
15
1 octet
Slow protocol subtype =0x0A
16-18
3 octets
ITU-OUI = 00-19-A7
19-20
2 octets
ITU-T subtype
21
4 bits
Version
1 bit
Event flag
3 bits
Reserved
22-24
3 octets
Reserved
25-1514
36-1490 octets Data and padding (see point j)
Last 4
4 octets
Frame check sequence
Event flag
: This bit distinguishes the critical time-sensitive behavior of the ESMC event PDU from the ESMC
information PDU. A value of 1 indicates an event PDU and a value of 0 indicates an information PDU.
IEEE Assigned OUI and Slow Protocol Subtype
8 bits
Type: 0x01
16 bits
Length: 00-04
4 bits
0x0 (unused)
4 bits
SSM code
QL TLV Format
Quality Level
Highest
QL-PRC
Highest
QL-SSU-A
|
QL-SSU-B
|
QL-SEC
|
QL-DNU
|
QL-INVx, QL-FAILED, QL-UNC, QL-NSUPP
Lowest
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