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C.3
Serial Ports
The Sun Ultra 45 or Ultra 25 workstation has two serial ports.
When powering off, the Sun Ultra 45 or Ultra 25 workstation sends a Break signal
out the serial ports. This break could interfere with a workstation-controlled server if
the server is operating through a Tip connection. Five solutions are available:
Configure for an alternate Break key sequence on the server.
Filter the Tip connection through a network terminal concentrator.
Disable the keyboard abort on the server.
Disable the Tip connection on the server.
Permanently Disable the Keyboard Abort or Configure an Alternate Break Key
Sequence on the Server
C.3.1
Configuring for an Alternate Break Key Sequence
on the Server
As superuser, open a terminal window and configure the alternate Break key
sequence. Type:
# kbd -a alternate
To invoke a keyboard abort, type Return, ~, Ctrl-B.
Note – You must reconfigure the alternate Break key sequence after a server power
cycle.
C.3.2
Filtering the Tip Connection Through a Network
Terminal Concentrator
The network terminal concentrator acts as a proxy between the Sun Ultra 45 or Ultra
25 workstation and the server under Tip control. The network terminal concentrator
communicates with the host Sun Ultra 45 or Ultra 25 workstation through the Telnet
C-8
Sun Ultra 45 and Ultra 25 Workstations Service and Diagnostics Manual • May 2006
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