System Management
7450 ESS OS Basic System Configuration Guide Page 243
The 7450 ESS sets its local parameters as follows:
The ITU-T profile is for use in an environment with only ordinary clock masters and slaves for
frequency distribution. The default profile should be used for all other cases.
The 7450 ESS can support up to 70 simultaneous external peers. Up to 20 of these peers can be
configured peers (possible Master or neighbor boundary clocks) and the remainder can only be
discovered peers (slaves).These peers use the Unicast Negotiation procedures to request service
from the 7450 ESS clock.A neighbor boundary clock counts for two peers (both a configured and
a discovered peer) toward the maximum limit.
Figure 13 shows the unicast negotiation procedure performed between a slave and a peer clock
that is selected to be the master clock. The slave clock will request Announce messages from all
peer clocks but only request Sync and Delay_Resp messages from the clock selected to be the
master clock.
Table 26: Local Clock Parameters When Profile is set to: itu-telecom-freq
Parameter Value
clockClass 80-110 – value corresponding to the QL out of the central clock of the
7750 SR as per Table 1/G.8265.1
255 – the 7750 SR is configured as ordinary clock slave
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