Total Control MP/16, Operator'S Manual

Page: 92 / 182

4-14 Cellular
Force ETC
AT Command:
S66.3=1
MIB Object: mdmCeV42EtcTxLevConDis
Some callers may be using an earlier ETC version that does not
generate the ETC calling tone used as of version 1.1. In order for
the modem to implement ETC when answering calls from these
modems, it must be set to force ETC for every call it receives. (In
this circumstance, the system administrator may wish to dedicate
some modems for cellular calls only.)
Settings:
S66.3=0 ETC on calling tone detect only
S66.3=1 Force ETC for all calls
DCE Startup Rate
AT Command: S66.4 and S66.5 (see the following table).
MIB Object
: mdmCeDceStartRate
Some cellular links may be so poor that calls are dropped even
before the modems can initialize modulation and error control
negotiation. To reduce the number of dropped calls, the modem
should be set to a 9600 bps startup rate. The modems negotiate at
the lower and more stable link rate, and after the link has been
established, raise the link rate to the higher levels afforded by ETC.
S66.4= S66.5= Startup Rate
0 0 Auto
1 0 4800
0 1 9600
1 1
Reserved
Enable Transmit De-emphasis
AT Command:
S66.6=1
MIB Object : mdmCeV42DceTxDemDis
Transmit de-emphasis is recommended when connecting over a
cellular link, whether the modem is on the fixed site or mobile site.
When enabled, transmit de-emphasis is automatically implemented
whenever the modem receives an ETC call.
Settings:
S66.6=0 Disabled
S66.6=1 Enabled