3Com 3C63400-3AC-C - PathBuilder S700 Switch, Reference Manual

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108 C
HAPTER
5: C
ONFIGURING
P
ATH
B
UILDER
S700 M
ODULES
, P
ORTS
,
AND
A
PPLICATIONS
2 Specify the clock sources to be used for system timing.
a From the System Clock Configuration menu select: [3] Set PriorityClock 1 to
open the Priority Clock Configuration menu, shown in Figure 75.
Figure 75 Priority Clock Configuration Menu
b Select the option corresponding to the clock source you want to use for the
system reference clock. In addition to the internal clock, you can designate any
of the following cards as clock source:
n
BITS
n
CBR, port n (n=1-4 for 4-port card or 1-8 for 8-port card)
n
DS3
n
E3
n
OC3
n
IMA, port n (n = 1-8)
n
FAM, port n (n = 1-8)
You can designate a card or a port as a clock source even if it has an alarm;
however, the card or port must be
In Service . If a card or port is Out of Service , it
will not appear as an option on the Priority Clock Configuration or Reference Clock
Port Selection menu.
c If you selected a non-multiple port clock source (Internal, BITS, DS3, E3, or
OC3) in step b, skip to step h; otherwise continue with step d.
d If you select a card that has multiple ports (CBR, IMA, or FAM), a reference
clock selection menu opens when you select that card as a clock source.
Figure 76 shown the CBR Reference Clock Selection menu. The reference clock
selection menus for the other multiple port cards are similar.