Pub. 42004-693L2C
Model 69320-101 Voice Network Adapter
Page: 6 of 15
\\s_eng\gtcproddocs\standard ioms - current release\42004 instr. manuals\42004-693l2c.doc
04/06
First Internal DIP Switch (SW4) Settings
N
OTE
:
First internal DIP switch (SW4) changes only take effect after powering down the card rack;
resetting the MCU is insufficient.
Position Number Name
Left
1
ST-Bus Clock Master
2
T1 Clock Master
3
T1
Synchronous
4
E1
Select
5
Sampling Rate Select
6
Reserved
7
Reserved
Right 8 Reserved
Set the ST-Bus Clock Master switch according to the following table:
Open
The VNA generates the Card Rack’s backplane ST-Bus clock signals. The VNA is the ST-
Bus Clock Master.
Closed
The VNA receives the Card Rack’s backplane ST-Bus clock signals. The VNA is a ST-Bus
Clock Slave.
Set the T1 Clock Master switch according to the following table:
Open
The VNA uses its received T1 signal’s timing to generate its transmitted T1 signal’s timing.
The VNA is a T1 Clock Slave.
Closed
The VNA uses the Card Rack’s backplane ST-Bus clock signals to generate its transmitted T1
signal’s timing. The VNA is the T1 Clock Master.
