Nortel ICS Install Manual page 521

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