GAI-Tronics 69320-001 Voice Network Adapter (VNA) - Manual (Page 6)

Pub. 42004-681L2A
Model 69320-001 Voice Network Adapter Page: 6 of 14
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06/04
Internal DIP Switch (SW1) Settings
N OTE : Internal DIP switch (SW1) 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.
Set the T1 Synchronous switch according to the following table:
Open The VNA is frequency locked to the received T1 signal. This setting is ignored if the VNA is
both a ST-Bus Clock Slave and a T1 Clock Slave.
Closed
The VNA is not frequency locked to the received T1 signal. “Elastic store” buffers in the T1
transceiver integrated circuit either duplicate or drop a frame as needed.
Set the E1 Select switch according to the following table:
Open
The VNA uses T1 signaling.
Closed The VNA uses E1 signaling. Note: upon initial release of the VNA, this feature does not
function properly.