Human operators can interact directly with TL1 equipment through a command line interface via Telnet or serial connection. Commands may be typed manually to query and control network elements.
Entering TL1 commands manually via command line must be done carefully, however, as any syntax mistake will result in an error. This can be especially frustrating, because the message must be retyped from scratch. If your NEs have special editing capabilities, you might be able to scroll back to your previous message and correct your mistake, but this is not a core part of TL1.
On some network elements, an echo feature is available to help you minimize retyping. As you type, your characters will be "echoed" back to you by the NE. You'll be able to see what you've typed as you compose your TL1 messages. Be sure to activate this option carefully, however. If multiple NE's can "see" your keystrokes, you may get multiple echos ("AAACCCTTT---UUUSSSEEERRR").
When 2 machines are communicating, you'll want to turn off any echo options, because machines always know what they typed. Echo can also cause confusion for alarm masters when it's accidentally left on.
Another potential solution is to activate a "local echo" option in your terminal software. This will make commands you type appear within your terminal. Should you make a mistake, you can generally copy your original message, correct the error, then resubmit the command without retyping it completely.
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