Cabletron Systems CSMIM-T1 - Manual (Page 172)

Chapter 7: AT Commands and Registers
7-46 CSMIM-T1 Hardware Installation Guide
Table 7-8 Saved Command Settings with S14
S16= n Bit Mapped Register, Test Options
Commands enable and disable loopback test options. Register S16 is a
read-only register that displays loopback test option status, and is
available only when the modem is in normal or direct mode. The modem
supports all loopback tests at 1200 bps or higher, but does not support
diagnostics in Bell 103, V.13, V.21, or V.23.
Bit
Position
Function Decimal Value
0 not used
1 command echo 0 no echo
1 echo
2 result codes 0 result codes
1 no result codes
3 result type 0 short form
1 long form
4 dumb mode 0 smart mode
1 dumb mode
5 dial method 0 tone dial
1 pulse dial
6 not used
7 originate/answer 0 answer mode
1 originate mode