GAI-Tronics 69320-001 Voice Network Adapter (VNA) - Manual (Page 12)

Pub. 42004-681L2A
Model 69320-001 Voice Network Adapter Page: 12 of 14
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06/04
Frequently Asked Questions
Q: Is the 69320-001 VNA compatible with the public switched telephone network?
A: No.
Q: When does the 69320-001 VNA generate at T1 Yellow Alarm?
A: When either (1) it does not detect a signal on its T1 receive line, or (2) when it detects the MCU and is
not synchronized with the signal on its T1 receive line and is not receiving a T1 Blue Alarm.
N
OTE : When receiving a T1 Blue Alarm the VNA is not synchronized with its T1 receive line, by the very
nature of the T1 Blue Alarm.
Q: When does the 69320-001 VNA generate a T1 Blue Alarm?
A: When either (1) it does detect a signal on its T1 receive line and does not detect the MCU, or (2) one of
its loopback functions are enabled.
Q: What is the T1 Red Alarm?
A: The T1 Red Alarm is the Loss of Signal (LOS) or Receive Carrier Loss (RCL) condition.
Q: Why do the LEDs have two labels?
A: One label is the newer vernacular; the other is the older vernacular.
Q: Why does the front panel “Lamp Test” switch not function while the VNA detects the MCU is running
(the MCU FLT LED is off)?
A: That behavior is by design. That design choice helps prevent the diagnostic function of the front panel
LEDs from being defeated while the system is in use.
Q: What feature does setting all DIP switches to closed, both rotary switches to zero, and the 2xx/3xx
jumper to 3xx enable?
A: Doing so enables all four relays on the VNA, lights all LEDs on the VNA, and routes a 2.0000 kHz tone
(assuming a different signal has not been loaded after power up) to all backplane audio lines and backplane
ST-Bus data lines. This feature is used to approximate the maximum power consumption and
electromagnetic emissions of the VNA. This feature interferes with normal system operations, and is
disabled while the VNA detects the MCU is running.
Q: Is the 69320-001 VNA capable of generating E1 timing instead of T1 timing.
A: No.
Q: Immediately after power up, all four T1 status LEDs are flashing 10% on, indicating the T1 transceiver
on the VNA is not initialized. Is there anything that can be done to correct this situation?
A: Yes.
Step 1: Remove power from the card rack.
Step 2: Disconnect the T1 line from the VNA.
Step 3: Apply power to the card rack.
Step 4: Reconnect the T1 line to the VNA.
It is not necessary to wait for the MCU to finish booting before reconnecting the T1 line to the VNA. Steps
1 and 2 may be swapped; however, it is important that the T1 line be connected to the VNA after the card
rack is powered for this fix to be effective. Resetting the MCU should have no effect on the situation.