Nortel Meridian 1 option 11C Planning And Installation Manual page 194

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Modems connected to Option 11C should be set as follows:
• CD (Carrier Detect): Active if carrier detected on incoming call
• CTS (Clear to Send): Normal operation or forced active
• Hardware and software: Disabled flow control.
The ports on Option 11C will be disabled if devices connected to them
generate extra "garbage" characters. For this reason, modems should not be
used in the following modes:
• Loopback
• Auto Echo
• Self Test.
Note: The SDI ports are designed for use with "dumb" modems.
"Intelligent" modems may be used, however care must be taken to ensure
that they do not enter into modes of operation that will send extra
characters to the system.
Table 24 on page 194 lists some of the problems that may be encountered.
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