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Page 192 of 332 Chapter 15 — Installing and connecting SDI and Ethernet ports
553-3021-209 Standard 3.00 April 2000
Modem setup requirements
Modems connected to the Option 11C Mini are set as follows:
• Carrier Detect (CD): Active if carrier detected on incoming call
• Clear to Send (CTS): Normal operation or forced active
• Hardware and software: Disabled flow control
The ports on the Option 11C Mini are disabled if devices connected to the
ports generate additional “garbage” characters. For this reason, do not use
modems in the following modes:
• Loopback
• Auto Echo
•Self Test
Note:
The SDI ports are designed for use with “dumb” modems.
“Intelligent” modems can be used. Make sure that the modems do not
enter into modes of operation that send additional characters to the
system.
Table 37 lists some of the problems that can be related to modems.
Table 37
Modem problems
Problem Solution
CDR is not printing on an ESDI port
configured as 8 bits, no parity, and 1 stop
bit.
Change the modem setup to 7 bits, no parity, 1
stop bit, or add MTC or SCH to the ESDI user
prompt.
Modem is not communicating with the
Option 11C Mini when the User is MTC,
BUG, or CTY
(The default setting of 8 bits, no parity, 1
stop bit is incompatible with the modem).
Change the modem setup to 7 bits or the parity
to EVEN/ODD.