Nortel Networks Option 11C Mini manual Modem setup requirements, Modem problems Problem Solution

Page 192 of 332 Chapter 15 — Installing and connecting SDI and Ethernet ports

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	Change the modem setup to 7 bits, no parity, 1
configured as 8 bits, no parity, and 1 stop	stop bit, or add MTC or SCH to the ESDI user
bit.	prompt.
Modem is not communicating with the	Change the modem setup to 7 bits or the parity
Option 11C Mini when the User is MTC,	to EVEN/ODD.
BUG, or CTY
(The default setting of 8 bits, no parity, 1
stop bit is incompatible with the modem).

553-3021-209 Standard 3.00 April 2000