Modem Setup Requirements - Nortel Meridian 1 Option 11C Planning And Installation Manual

Page 214 of 408 Installing and connecting SDI and ethernet ports

Modem setup requirements

553-3021-210 Standard 7.00
to install and connect an ethernet cable to the Option 11C main cabinet.
Option 11C SDI ports are provided by the following cards:
• NTDK20 Small System Controller (SSC) card: provides three SDI ports
• NTDK23, NTDK25 and NTDK80 Fiber Receiver cards: each provides
one SDI port
• NTAK02 SDI/DCH card: provides four ports of which up to two can be
SDI ports
• NTAK03 TDS/DTR card: provides two SDI ports.
Note: The functionality of the NTAK03 card has been incorporated into
the NDK20EA Small System Controller (SSC) card. The Option 11C,
however, supports these cards in conjunction with the SSC card.
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 25 on page 215 lists some of the problems that may be encountered.
January 2002