Models 707B and 708B Switching Matrix Reference Manual
Section 2: General operation
707B-901-01 Rev. A / August 2010
2-93
Determining the number of relay closures
The Models 707B and 708B keeps an internal count of the number of times each switching card relay
has been closed. The total number of relay closures is stored in nonvolatile memory on the switching
card. Use this count to determine when relays require replacement (see the card documentation for
information regarding the contact life specifications).
Relay closures are counted only when a relay transitions from open to closed state. If you send
multiple close commands to the same channel without sending an open command, only the first
closure is counted.
NOTE
The counts reported for the following cards indicate the number of closures since the last power cycle
of the card:
7072
7072-HV
7173-50
7174A
For all other cards, the number of closures are the closures that have occurred over the lifetime of the
card.
To view the close count for a channel from the front panel:
1. Use the navigation wheel
to select the channel.
2. Press
the
CONFIG
key.
3. Press
the
CHAN
key.
4. Use the navigation wheel to scroll to the "COUNT" menu item.
5. Press
the
ENTER
key
(or the navigation wheel) to display the close counts.
6. Use
the
EXIT
key
to leave the menu.
To view the close count for a channel from the web interface:
1. From the list on the left, select a slot with an installed card.
2. Right-click a channel. The Channel Configuration dialog box is displayed.
3. Check the value in the Closure Count box.
NOTE
You can also work with channel patterns using the command
channel.getcount()
.
Identifying installed switching cards
Press the
SLOT
key to scroll through the model numbers, descriptions, and firmware revisions of the
installed switching cards.
