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3-6. The order of Tie Line link usage.
The Tieline Link Number which is used in calls between exchanges is not
directly indicated, but you can possibly get it from the link number
which is indicated on the HCU-52.
When one Tieline Link brings up some problems which cause the system not
to work properly, try to find which link number is causing the problems
from the indication on the HCU-52 of the exchange making the call.
As diagram Nol and No2 shows, in the exchanges which make calls, the DLU
Link Number corresponds with TI Tieline Link Number.
In the exchange which is called,the Tieline Link Number of the TI Unit is fixed
by connection between exchanges.
DLU Links are used in numerical order.
1. Tieline for 2 exchanges
Station Which calls
Diagram 1
No.470
Station which is called
2. Tieline for 3 exchanges
Exchange which is called
Exchange which calls
Station which calls
Diagram 2
No.470
Exchange which calls
Exchange which is called
– 18 –
Connection Cable
between exchanges