Longshine LCS-8560C1 - Manual (Page 91)

AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
102184B Conexant 3-51
Behavior in Data Mode (+FCLASS=0)
When on-hook, if the line is in use and an ATDT is issued, the modem will not go off-
hook and will return with the message LINE IN USE.
When off-hook and either an extension is picked up or a line reversal is detected, the
modem will drop the connection. The disconnect reason in register S86=25 (this is also
defined for #UD). The user must flash the hook in order to get a dial tone due because the
remote server will be retraining.
If the local handset is picked up while the modem is off-hook, the modem will do a link-
disconnect, flash the hook for 1.5 seconds, then connect the local handset to the line. At
this point, the user dial tone should be on the local handset. The disconnect reason in
S86=25.
Behavior in Voice Mode (+FCLASS=8)
When in voice mode and an extension is picked-up, a <DLE>P is sent to the DTE. When
the modem is off-hook , a line reversal may also be detected in which case a <DLE>l is
sent to the DTE.
In voice mode, there is no blocking of ATDT when the line is in use. Also, there is no
automatic hang-up in voice mode as in data mode. There is only the above stated <DLE>
shielding event reporting.
Operation in Data Mode
Line In Use (Enabled by AT-STE=1, AT-STE=3, AT-STE=5, or AT-STE=7)
Case 1: Telephone Line is in Use
If an ATDT, ATDP or ATDL is issued while Line In Use detection is enabled and the
telephone line is in use, the modem will immediately return the message LINE IN USE to
the DTE without going off-hook, and then return to command mode.
Case 2: Telephone Line is in Use But Disconnected
If an ATDT, ATDP or ATDL is issued while Line In Use detection is enabled and the
telephone line is NOT in use, the modem will go off-hook after a short pause, then
respond with CONNECT or NO CARRIER message.
Case 3: Telephone Line is Not Connected to Modem
If an ATDT, ATDP or ATDL is issued while Line In Use detection is enabled and the
telephone line is not connected, the modem will go off-hook momentarily, go back on-
hook, then respond with NO LINE message.
Extension Pick-up (Enabled by AT-STE=2, AT-STE=3, AT-STE=6, or AT-STE=7):
Case 1: Modem off-hook, Local Handset Goes Off-Hook
If the local handset goes off-hook while the modem is in a data connection, the local
handset will be muted. The modem will then send a GSTN Cleardown to the remote
modem and then go on-hook. The modem will then send an OFF HOOK INTRUSION
message to the DTE. A result code of 25 will be left in S86 register. After 2 seconds, the
local handset will be connected to the telephone line so the user hears the dial tone.