Alarm Conditions That Cause Clock Source Failure; Viewing And Configuring Rs-232 Parameters - 3Com 3C63100-AC-C - PathBuilder S600 Bridge/router Reference Manual

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HAPTER ONFIGURING
Viewing and
Configuring RS-232
Parameters
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ATH UILDER ODULES
If priority clock #1 fails, priority clock #2 becomes operative; if priority clock #2
fails, priority clock #3 becomes operative, and so on. For a list of the alarm
conditions which cause a clock source to fail, see Table 26 later in this section.
3 Select [1] Set Clock Mode, and set the clock mode to one of the following:
Revertive—If priority clock #1 fails, and priority clock #2 or higher becomes
operative, the system reverts to priority clock #1 if this clock source becomes valid
again within the specified Revertive Time (see step 4),
Non-Revertive—If priority clock #1 fails, and priority clock #2 or higher becomes
operative, the system does not revert to priority clock #1 after it becomes valid
again.
In non-revertive mode only, you can manually switch to priority clock source
#1—or the highest valid clock source. To do this, select [11] Set SysClk to Highest
Priority from the System Clock Configuration menu.
4 (revertive mode only) Select [2] Set Revertive Time and specify the length of time
(10-900 seconds) the system will monitor priority clock #1 before either reverting
to it (if the clock source becomes valid again) or continuing to use a lower priority
clock source.

Alarm Conditions that Cause Clock Source Failure

Table 26 lists the alarms conditions that cause different cards to fail as clock
sources.
Table 26 Clock Source Failure Alarms
Card Alarms
BITS LOSS OF CLK
CBR LOS, OOF
DS3 LOS, OOF, LCD (IF ON PCLP)
E3 LOS, OOF
OC3 LOS, LOF, LOCD
IMA LOS, OOF
FAM LOS, OOF
The Management CPU module has two RS-232 ports:
Port #1 connects to a local VT100 terminal. You can view the communication
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parameters for this port, but you cannot change them via the NMS menus.
Port #2 allows you to run SLIP/PPP. This port can connect via a modem to the
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user management network. You can view and configure communications
parameters for this port via the NMS menus.
You must configure your terminal or workstation to match the default settings of
RS-232 port #1 and normally you will want to do the same for port #2.
Table 27 lists the default settings for the RS-232 ports.
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ORTS AND PPLICATIONS