ACC Installation and Configuration Guide

Chapter 4 71
Dual Interface Configurations
Default Port Modes
DefaultPortModes
The following list shows the mode of the ports.
• All ports on all ACC cards are in Loopback (Tri-state) mode w hen the
system in which the cards are installed is powered down.
• All ports on all cards are in Loopback mode when the system is
powered up, but the zmon utility has not y et been run in order to
bring up the ZCOM subsystem.
• The ports may be in Loopback, RS-232, X.21, etc. mode when the
system is brought up and zmon is scheduled (by zmasterd) to bring up
the ZCOM subsystem, depending on the TTGEN configuration file
that corresponds to the .tmem file used to bring up the subsystem.
That is, those ports that are configured to be in Loopback mode will
be in Loopback mode. Those that are defined to be in RS-232 mode
will be in RS-232 mode, etc.
Those that are not defined will also be in Loopback mode. (This would
be the case for ports that are on a MUX that is installed into the
system but is not included in the TTGEN configuration file.)