ADTRAN ISU 128 User Manual page 105

Appendix A. AT Commands
Command Function
AT Command Response Message Types
V0 Numeric response messages
V1 Verbal response messages words
AT Command Connect Message Options
X0 Simple connect message
X1-7 Connect messages with bit rate
Ready-To-Send (RTS) Control Line Options
_D0 1 ms delay
_D1 18 ms delay
Service Profile Identification (SPID) Access Options
_I1 Access SPID 1
_I2 Access SPID 2
Local Directory Number (LDN) Access Options
_N0 Access LDN1
_N1 Access LDN2
ISDN Switch Protocol Options
_S0 5ESS
_S1 DMS-100
_S2 National ISDN-1
_S3 NEC
ISDN U-Interface Operational Mode Options
_X0 ISU timing slaves to network (NT)
_X1 ISU is U-interface timing master (LT)
Data Flow Control Options
\Q0 No flow control
\Q1 Software
\Q2 CTS only
\Q3 Hardware
\Q4 Software from DCE only
90 ISU 128 User Manual 61202.029L2-1