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Model | Page: 5 of 15 |
The Receive Equalizer Gain Limit switch controls the similarly named feature of the T1 transceiver. Set the Receive Equalizer Gain Limit switch according to the following table:
Open | |
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Closed | |
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The Lamp Test switch turns on all LEDs on the VNA’s front panel. It is used during production of the VNA. The Lamp Test switch will not function when the VNA detects the MCU (MCU FLT LED is Off). Set the Lamp Test switch according to the following table:
Open | All front panel LEDs function normally. |
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Close | All front panel LEDs are ON |
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The Customer Disconnect function presents a
Open | The T1 transceiver is operating normally. |
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Closed | The Customer Disconnect signal is being transmitted on the T1 line. This setting disrupts the |
| T1 signal and the MCU reports a T1 line fault. |
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The Local Loop Back feature sometimes is used during troubleshooting. Set the Local Loop Back switch according to the following table:
Open | The T1 transceiver is operating normally. |
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Closed | The “Framer Loopback” feature of the T1 transceiver is enabled. The T1 transceiver transmits |
| the Blue Alarm on the T1 transmit line during this condition. This setting disrupts the T1 signal |
| and the MCU reports a T1 line fault. This setting causes the VNA to receive the T1 signal it |
| normally would transmit, while actually transmitting the Blue Alarm. |
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The Remote Loop Back feature sometimes is used during troubleshooting. Set the Remote Loop Back switch according to the following table:
Open | The T1 transceiver is operating normally. |
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Closed | The “Remote Loopback” feature of the T1 transceiver is enabled. This setting disrupts the T1 |
| signal and the MCU reports a T1 line fault. This setting causes the VNA to transmit its received |
| T1 signal. The T1 standards mention two types of loopbacks: “line” and “payload”; this |
| loopback is a “line” loopback. |
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\\s_eng\gtcproddocs\standard ioms - current release\42004 instr.
