COURIER HIGH SPEED MODEMS
  | &S2  | This option is for specialized equipment such as  | 
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  | automatic callback units. On loss of carrier, the modem  | 
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  | sends a pulsed DSR signal with Clear to Send (CTS)  | 
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  | following Carrier Detect (CD).  | 
  | &S3  | This is the same as &S2, but without the CTS following  | 
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  | CD.  | 
  | &S4  | The modem sends the computer a DSR signal at the same  | 
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  | time as it sends the Carrier Detect (CD). | 
&Tn  | Modem testing  | |
  | &T0  | End test  | 
  | &T1  | Initiate Analog Loopback (AL) testing  | 
  | &T2  | Reserved  | 
  | &T3  | Initiate Local Digital Loopback (LDL) testing  | 
  | &T4  | Grant Remote Digital Loopback (RDL)  | 
  | &T5  | Deny RDL  | 
  | &T6  | Initiate RDL testing  | 
  | &T7  | Initiate RDL with self test and error detection  | 
  | &T8  | Initiate AL with self test and error detection  | 
&W  | Write the desired template to NVRAM, using the &W  | |
  | command.  | |
  | &W0  | Write to NVRAM template 0  | 
  | &W1  | Write to NVRAM template 1  | 
&Xn  | Synchronous transmit clock timing signals setting. Determines  | |
  | whether the modem or DTE will generate the timing signals.  | |
  | &X0  | The Courier is the source of the Transmit clock timing  | 
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  | signals and sends them to your DTE over the   | 
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  | interface. The DTE rate will follow the connection rates.  | 
  | 
  | Default.  | 
Alphabetical Command Summary