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User’s Guide 
 
AT Command Reference 
 
2110212 Rev 1.0 
 
Page 111 
 
Table 12-5:  WS-Registers in CDPD Mode (continued) 
Register Description 
Range 
Default 
Units 
70 
PAD Inter-Character Timer 
The timer is reset whenever input is received from the host 
(DTE).  On expiry of this timer the modem will terminate the 
packet and forward it to the network. 
NOTE:  If the setting is very low and manual typing is used to 
enter data, then access to the escape sequence (TIES) may be 
lost.  See Section 6.6.3.2 for details. 
Value Meaning 
0 
Disabled  (Default) 
1 – 255  Timeout in tenths of a second. 
0 – 255 
0.1 s 
72 
PAD Input Buffer Editing Enable 
Enables / disables the PAD’s capability to perform local 
editing of CDPD Network bound data.  If enabled, the PAD 
will remove one character from the PAD’s input buffer upon 
receipt of the character specified by +WS73 (PAD backspace 
character). 
If both On-line Echo (+WS62) and this register are enabled, 
upon receipt of the backspace character (+WS73) the PAD 
will echo the following character sequence to the host (DTE): 
<backspace character> <SP (0x20)> <backspace character> 
where the backspace character is that defined in +WS73 
Value Meaning 
0 Disabled 
1 
Enabled  (Default) 
0,1 1   
73 
PAD Input Buffer Backspace Character 
Specifies the character to be used by the PAD as “backspace” 
if local editing is enabled (+WS72
0 – 255 
8 <BS> 
 
74 
PAD Maximum Packet Length 
Sets the maximum length of the packet assembly buffer.  
When input reaches this length, the packet is terminated and 
forwarded to the CDPD network. 
This feature can be used to control packet forwarding if the 
characteristics of the telemetry prevent both the forwarding 
character (+WS63) and inter-character timer (+WS70
mechanisms from being used. 
This value is the data content exclusive of headers.  UDP adds 
28 bytes of header.  TCP adds 40 bytes of header.  Long 
packet buffers may be fragmented into smaller IP packets if 
required by network router limitations.  If this happens, it is 
transparent to the user. 
1 – 1000 
1000 
Bytes