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Vanguard 7300 Enclosures and Components 2-37
Vanguard 7300 Cards
• There is one Card Clock on each card. Card Clock allows you to lock multiple
Groups together and must be used for voice ports.
• There is one System Clock bus in the node, which allows you to lock multiple
cards together.
You set each group on a card (four ports) as to whether it participates in Card Clock
or not and you set the card as to whether it participates in System Clock.
Figure 2-25 shows this arrangement, with X’s showing where the connections points
are located.
Figure 2-25. Clocking Example
If you have an external device providing a clock to a port, that clock, if it is the first,
highest priority clock in the group will drive the Group clock. You can configure
Group Clock to drive Card Clock. Card Clock can then be used to synchronize
different Groups and/or to drive System Clock. System clock can be used to
synchronize multiple cards.
If you are running Voice, the PCM encoded port must be on ports 1-2 and the Group
Clock (for group 1) must be set to Card Clock.
Port 1
Port 4
Port 5
Port 8
Port 9
Port 12
T1/E1 Cards
System
Clock
Bus
Card
Clock
Bus
Group
Clock
Bus
Port Timing Group Clock set to
Group Clock
Group Clock set to Card
Clock
Card Clock set to
System Clock
Internal All four ports are isolated
from other groups. Port used
Group Clock for transmit
and expects the remote
device to return this clock.
Note
If all ports in the group are
internal, the ports will uses
Card Clock for their trans-
mit.
Card Clock drives Group
Clock's transmit.
Note
Group must be set to Card
Clock for voice connections.
System Clock drives Card
Clock's transmit.
Note
Do not set all ports to
Internal when set for system
clock or there will not be a
master clock source and
connections will not operate
properly.