Cabletron Systems CSMIM-T1 - Manual (Page 173)

Registers
CSMIM-T1 Hardware Installation Guide 7-47
Table 7-9 Saved Command Settings with S16
S18= n Test Timer
Range: 0 - 255 seconds
Default: 0 seconds (disables timer)
Sets how long the modem conducts a loopback diagnostic test.
Register S18 is available only in normal or direct mode. When
S18 is set to 0, type AT&T0 to end a test.
Bit
Position
Function Decimal Value
0 Local Analog Loopback 0 disabled
1 enabled
1 not used
2 Local Digital Loopback 0 disabled
1 enabled
3 Remote Digital Loopback status
(initiated by the remote modem) 0
1 loopback Off
loopback in
progress
4 Initiate Remote Digital 0 disabled
Loopback 1 enabled
5 Initiate Remote Digital 0 disabled
Loopback with Self-Test 1 enabled
6 Initiate Local Analog 0 disabled
Loopback with Self-Test 1 enabled
7 not used