Multi-Tech Systems ISIHP-4U S89 Off-line Time, S108 Line Code Control, S109 PCM Mode Control

Modem AT Commands & S-Registers

Range: 0-1

Default: 1 (enabled)

Used for testing and debugging only. Enables and disables V.32bis start-up auto mode operation. Set S43 to zero (0) to disable start-up auto mode, or 1 (the default) to enable start-up auto mode.

S89 Off-line Time

Unit: 1 second

Range: 0, 5-255

Default: 0

Sets the length of time, in seconds, a modem waits in the off-line command mode before it goes into standby mode. If S89 is set to 20 seconds, the modem waits 20 seconds in off-line command mode before going into standby mode. Setting S89 to zero (0) prevents the modem from ever entering standby mode.

Setting S89 to any value between zero and five (1-4) effectively sets the value to five, because five seconds is the minimum possible wait time.

S108 Line Code Control

Unit: Decimal

Range: 0, 1

Default: 1

Controls the line coding used by the modem.

S108 = 0	mu-law
S108 = 1	A-law (default)

S109 PCM Mode Control

Unit: Decimal

Range: 0–2

Default: 1

Controls the PCM ( pulse code modulation) mode (V.90 or K56Flex). Determines which mode the modem will answer in for PCM connections.

S109 = 0	K56Flex support only
S109 = 1	Both V.90 and K56Flex supported
S109 = 2	V.90 support only

MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD 99