Nortel Modular ICS 7.1, Install Manual

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Hardware /
521
N0130943 02 Modular ICS 7.1 Installer Guide
Norstar connected to another switch in a closed T1 or PRI network
Norstar connected in a series of switches in a T1 or PRI network
T1 or PRI
service
provider
Norstar ICS
Norstar or other switch
Primary - DTI 1 obtains the
timing from the T1 service
provider
Secondary - DTI 2 acts as
standby to obtain timing from
the network
Secondary - DTI 2 acts as
standby to obtain timing
from the network
Primary - DTI 1
obtains the timing
from the T1
service provider
Norstar ICS
Primary - DTI 1 obtains the timing
from the T1 service provider
Timing master - DTI 1 transmits the
system's timing to the other switch
T1 service
provider
Norstar or other switch
Primary reference
T1 or PRI
service
provider
Primary reference
Primary - DTI 1 obtains timing
from T1 service provider
Timing Master - DT1 1 transmits
system timing to other switch
Norstar or other switch
Norstar ICS