1
097-55501-01 Issue 6 – June 2003 113
2
5
3
Operational Verification & Configuration
When the first input becomes qualified it will also become active, indicated
by the “A” lamp column. The illuminated lamp means that this is the timing
input that has been selected as the timing source for the outputs. If the
clock card is “Active” (indicated by the Active lamp), then the “A” input is the
one that will be used if this card becomes active. In general, both Active and
Standby clock cards will qualify and select as “A” the same input(s).
As additional inputs become qualified the chosen active input may change.
There are numerous options for controlling the criteria for active input
selection. Refer to the keyword SYNCMDE in the TimeHub 5500 TL1
Reference Manual for details.
The most basic setting defines a priority such that the topmost qualified
input will be selected as active. Thus, if DS1 inputs 3 and 4 are the only
ones qualified, 3 will be selected as active.
As soon as an input becomes qualified, the Freerun lamp will turn off,
indicating that the active timing reference is no longer the internal oscillator.
4.5.1 Expansion Shelf Controller Cards
If configuring an expansion shelf, continue with this section. If configuring a
main shelf only, skip to the next section. Chapter 1 provides a section
covering many details about expansion shelves.
Throughout the process it may be helpful to connect a terminal program
(such as Hyper Terminal) or, even better TimeScan THC which is the local
craft software for TimeHub. Doing so will allow event status to be observed
throughout the installation process. Instructions for connecting to the serial
(craft) port connection on a TimeHub master shelf are covered in this
manual. The TL1 manual contains detailed information about the command
interface. TimeScan THC version 2.2 (or later) supports the expansion shelf
capability (allows direct configuration of expansion shelf outputs). If you do
not have this software and would like to have it, contact Symmetricom CAC.
If you do have TimeScan THC version 2.2 (or later) things that may be useful
to observe during configuration include:
• Automatic messages. You can bring up a separate form for this
from a menu selection (Mode->Automatic Messages). This form will
update whenever the TimeHub sends out a event message. For
example, when an expansion controller card is inserted, an event
indicating that the insertion has occurred will be generated.
N
OTE
: Many inputs can be qualified but only one input can be
active on a clock card.
To Next Page
Loading...
Need help?
General
