Toshiba DK424 Manuale Utente

This program assigns the T1, PRI or BRI interface RPTU PCB as a Primary or Secondary timing 
source. The DK is synchronized to the Public Network. If the Primary synchronization is lost, it 
switches to the secondary timing source. 

When a T1 or PRI slot number is assigned, the DK only accepts a “1” for the circuit number. The 
circuit number is only used for BRI interfaces to specify which circuit is to be used for the Clock 
Source. If the PCB in this slot is not a T1 or ISDN PCB, the system will not accept data and any 
entries will be cleared.

BRI interfaces should be used as a clock source only when a T1 or PRI interface is not equipped

Set T1 parameters and assignments with the Program 

41 (Part 1) and  42 (Part 2) series. See the 

Strata DK Installation and Maintenance Manual for additional T1 information. RDTU/RPTU 
support is as follows:

For proper T1 or ISDN operation, the equipment at each end of a digital T1 span line must be 
synchronized. The DK is synchronized (as slave) to the equipment on the other end of the digital 
line by the RDTU/RPTU, RBUU/RBUS PCB designated as the Primary Reference in Program 

42-1.
If a malfunction occurs and Primary Synchronization is lost, the DK automatically switches modes 
and synchronizes to the equipment connected to the secondary PCB designated as the Secondary 
Reference. If the equipment on the other end of the DK digital lines should synchronize to the DK 
clock source, then enter blanks in Program 

42-1 and 2. In this case, the DK clock runs free and is 

considered the Master Synchronization source. 

✱ ✱  ✱ ✱  6SNU ✱   +ROG  6SNU

+ROG  6SNU   +ROG  6SNU   +ROG

Primary

Secondary

RCTUA

0

4

RCTUBA/BB

2

8

RCTUC/D

6

14

RCTUE/F

8

20

Circuit Number

SEL = 1 or 2
1 - Primary Source
2 - Secondary Source

PRIMARY/SECONDARY = 

Slot Number of Primary or Secondary PRI Clock 
Source (Release 4.0 entry. Not used for release 3.1