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Configuring PPP Services
A-26 117360-A Rev. A
Parameter: Async Control Character Map
Path: Protocols > PPP > Interfaces > Lines
Default: 655360
Range: 0 through 4294967295 (0x00 through 0xFFFFFFFF)
Function: This parameter is relevant only if you use an asynchronous modem. During LCP
negotiations, the peers negotiate the characters that they will recognize as
modem control characters.
The async control character map specifies a value representing one or more
asynchronous modem control characters for the peer to recognize (“escape”)
and that may occur in the data packet. Each bit in the map represents a control
character from 0x00 through 0x1F. The default value serves for almost all
modems. It escapes the asynchronous modem control sequence XON/XOFF
(0x11 and 0x13) if they occur in the data stream. The values 0x7D and 0x7E are
always escaped.
PPP displays the decimal number equivalent to the string and uses that value in
its link negotiations.
Instructions: Accept the default value 655360 (0x000A0000) or enter the value
corresponding to the asynchronous control character map for the character(s)
that you want recognized (“escaped”) in the data stream. It is unusual to require
a value other than the default.
If you must create a different map, here’s how to do it. The map consists of 32
bits. Each bit corresponds to one control character, 0x00 (the right end of the
map) through 0x1F (the left end of the map); that is, 0 through 31, decimal.
If you have a modem that requires control characters different from the default,
determine the corresponding bit for each character by converting the hex value
of the control character to decimal. For example, 0x1F = 31 decimal, so to
escape that character, set the leftmost bit in the map. Do the same thing for each
control character to be escaped. Once you’ve decided what bits in the map to
set, enter either the hex character equivalent to the bit string or the decimal
equivalent. To escape all control characters in a packet, set the map to
0xFFFFFFFF.
MIB Object ID: 1.3.6.1.4.1.18.3.5.9.2.1.1.41
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