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Data Communication and Host Modes
Rev 3.0B Feb.08 70
TheTCPsessionwillbeterminatedifnodataistransmittedor
receivedforthetimeintervalspecifiedinTCPTandTCPS.
TCPTisthenumberofminutes(TCPS=0)orseconds(TCPS=1)
usedforthisidletime‐out.
Caution: TCPT should never be 0 when using the TCP mode. A
broken TCP session can result in the modem being left with a TCP
half-open connection that can only be terminated with a reset.
TCP Auto Answer
TCPautoanswer(S0=1|2)alsoallowsaTCPconnection
requesttobe“answered”whenthemodemisidle,notina
datasession.TheTCPconnectionrequestʹsdestinationport
hastomatchthemodemʹsdeviceport.
Note: UDP auto answer may also be set simultaneously with TCP
auto answer. Then, when in the idle state, the modem will accept
either a TCP connection request or UDP incoming packet, and enter a
TCP or UDP session as appropriate.
Hybrid Modes
Hybridmodesaresupportedmainlyforlegacyimplementa‐
tions.Someprevioushybridmodes(MD=5,6)arenolonger
implementedasspecial,uniquemodes.NowthatUDPauto
answer(UDPHalf‐open,S82=2)canbeenabledinconjunction
withUDPPADmode(MD3),effectivelythisisthesameas
MD5andMD6previouslyaccomplished.SettingMD5and
MD6arestill
supported,butnotrecommended.
AT Command Hybrid Mod
(MD5)
Hybrid Mode2
(MD6)
MD
3 3
S82
2 2
S0
1 1
*UDPLAST
0 1