Long-Space Disconnect (Y); Guard Tones (&G) - Black Box 325 User Manual

6.11.9 L S D
ONG PACE
One method of disconnecting two modems is called long-space disconnect. When any disconnect
condition is detected by the local modem, it will send 4 seconds of data space condition to the remote
modem before disconnecting. This signals the remote modem to disconnect. The local modem will
disconnect if it receives 1.6 or more seconds of data space condition from a remote modem. If break
sequences of 1.6 or more seconds are to be sent, enter ATY to disable this feature and prevent
unintentional disconnects.
Command
Y
Y1
†default
6.11.10 G T
UARD ONES
This option controls the generation of CCITT V.22 guard tones. These guard tones are not used in the
United States.
Command
&G
&G1
&G2
†default
(Y)
ISCONNECT
This option must be disabled if SDLC NRZI data is used.
Table 6-22. Long Space Disconnect (Y).
Operation
Long space disconnect off
Long space disconnect on†
(&G)
Table 6-23. Guard Tones (&G).
Operation
No guard tone†
550 Hz guard tone
1800 Hz guard tone
CHAPTER 6: Asynchronous Operating Commands
NOTE
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