System Management
7950 SR OS Basic System Configuration Guide
Page 247
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 unallocated SSM value is
received, where x represents the binary value of this SSM. Within the 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 , 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.
Содержание 7950 XRS Series
Страница 8: ...Page 8 7950 SR OS Basic System Configuration Guide List of Tables...
Страница 10: ...Page 10 7950 SR OS Basic System Configuration Guide List of Figures...
Страница 14: ...Preface Page 14 7950 SR OS Basic System Configuration Guide...
Страница 46: ...VI Editor Page 46 7950 SR OS Basic System Configuration Guide...
Страница 76: ...File Management Tasks Page 76 7950 SR OS Basic System Configuration Guide...
Страница 78: ...File Command Reference Page 78 7950 SR OS Basic System Configuration Guide...
Страница 92: ...Basic Command Reference Page 92 7950 SR OS Basic System Configuration Guide show system candidate...
Страница 172: ...Basic CLI Commands Page 172 7950 SR OS Basic System Configuration Guide...
Страница 184: ...Configuration Notes Page 184 7950 SR OS Basic System Configuration Guide...
Страница 214: ...DNS Configuration Commands Page 214 7950 SR OS Basic System Configuration Guide...
Страница 220: ...Show Commands Page 220 7950 SR OS Basic System Configuration Guide...
Страница 494: ...System Commands Page 494 7950 SR OS Basic System Configuration Guide...
Страница 500: ...Standards and Protocols Page 500 Standards and Protocols...
Страница 502: ...Index Page 502 7950 SR OS Basic System Configuration Guide system parameters 252 system time elements 256 timing 294...