Alcatel-Lucent 7210 SAS-D User Manual

System Management
7210 SAS D, E, K OS Basic System Configuration Guide Page 197
Synchronous Ethernet functionality (refer to ITU-T G.8262). The 802.3 standard link Master-
Slave timing states must align with the desired direction of Synchronous Ethernet timing flow.
When a fixed copper Ethernet port is specified as an input reference for the node or when it is
removed as an input reference for the node, an 802.3 link auto-negotiation is triggered to ensure
the link timing aligns properly.
The SSM of Synchronous Ethernet uses an Ethernet OAM PDU that uses the slow protocol
subtype. For a complete description of the format and processing see ITU-T G.8264.
Clock Source Quality Level Definitions
The following clock source quality levels have been identified for the purpose of tracking network
timing flow. These levels make up all of the defined network deployment options given in
Recommendation G.803 and G.781. The Option I network is a network developed on the original
European SDH model; whereas, the Option II network is a network developed on the North
American SONET model.
In addition to the QL values received over SSM of an interface, the standards also define
additional codes for internal use. These include the following:
• QL INVx is generated internally by the system if and when an un allocated SSM value is
received, where x represents the binary value of this SSM. Within the SR/ESS all these
independent values are assigned as the singled value of QL-INVALID.
• QL FAILED is generated internally by the system if and when the terminated network
synchronization distribution trail is in the signal fail state.
Within the SR/ESS, there is also an internal quality level of QL-UNKNOWN. This is used to
differentiate from a received QL-STU code but is equivalent for the purposes of QL selection.
Table 23: Synchronization Message Coding and Source Priorities
SSM value received on port
SDH interface
SyncE interafce in
SDH mode
SONET Interface
SyncE interface in
SONET mode
E1 interface T1 interface (ESF) Internal
Relative
Quality Level
0010 (prc) 0001 (prs) 0010 (prc) 00000100 11111111
(prs)
1. Best quality
0000 (stu) 00001000 11111111
(stu)
2.
0111 (st2) 00001100 11111111
(ST2)
3.

Alcatel-Lucent 7210 SAS-D Specifications

General

Brand	Alcatel-Lucent
Model	7210 SAS-D
Category	Switch
Language	English