Agilent Technologies Auroraduet N1726A, Руководство пользователя, Страница: 177 / 507

aurora
Duet
- User Guide
4 - 36 422685
Checking the S-bus Cable
You can test the integrity of the S-bus cable using the S
Bus cable tester, which is an optional accessory - for
information, contact your Hewlett Packard
representative.
With the S Bus Tester, you can test the integrity of all 8
conductors on an S-Interface cable of up to 300m length.
This is useful for identifying cable defects, including short
and open circuits and crossed connections. You can also
use the S Bus Tester to detect termination resistors.
2
Note
For information on using the S bus cable tester, please
refer to the
aurora
Duet
S-Bus Cable Tester User Guide
(422984).
Checking Layer 1
Layer 1 (the ‘physical’ layer of the OSI 7-layer model) is
responsible for the electrical, mechanical and interface
aspects of transmitted data. For calls to be possible,
Layer 1 needs to be active - i.e. available for passing
Layer 2 frames.
In Simulate mode, you can tell whether Layer 1 is active
by checking the
L1 LED. Off means that Layer 1 is not
active, Red shows the presence of the layer 1 clock on the
line and Green shows that Layer 1 is fully active.
The status of Layer 1 is also indicated by a vertical arrow
on the status bar of the Main menu. For example:
↑↑↑↑↑ indicates the layer is up
↓↓↓↓↓ indicates the layer is down.
Chap4s2.PM6 17/06/99, 09:42 36