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Chapter 3. Configuration
61200659L1-1 MX2800 STS-1 User Manual 3-7
External Clock Configuration
PRI Ext. Clock and SEC Ext. Clock - When timing is set to
external, these entries allow selection of the primary and secondary
clock source. Any one of the 28 ports, so long as it is active, can be
used. If the selected port does go into AIS or LOS, the selected
clock becomes invalid.
VT INTERFACE
The
VT I
NTERFACE
menu (shown in Figure 3-4 on page 3-7) allows
you to activate/deactivate individual T1s and E1s and to set their
line coding, length, loopback detection, circuit protection, and line
ID string. The T1/E1 code violation threshold is also configured
through this menu. Configuration selections are described in the
sections following Figure 3-4 on page 3-7.
Figure 3-4. VT Interface Menu
A VT group can be divided into either three E1s or four T1s. Therefore,
when dealing with an E1 configuration, some of the fields in the
VT
I
NTERFACE
menus do not apply (and therefore display
N/A
).