Verilink Access Manager 2000 (896-502037-001) Product Manual - Manual (Page 293)

Displaying individual circuit element status
Access Manager 2000 User Manual 8-23
In the following screen, the status indicators show the source of timing
for the TIU .
■
If both the EXT TTL and EXT 422 lines on the screen are NO
and the Frequency line indicates Nx56kbps or Nx64kbps ,
then the TIU is timing off the data bus from a DIU.
■
If either the EXT TTL or EXT 422 line is YES on the screen
and Frequency line is Nx56kbps or Nx64kbps , then the
TIU is timing off a data port.
The following items explain the fields in this screen.
Field Value Meaning
Frequency The frequency of the clock source from which
the TIU derives synchronization.
EQPT Clock Yes The source clock is in the signal received fro
the EQPT.
NET Clock Yes The source clock is in the signal received fro
the NET.
DIU Yes The source clock is derived internally, from the
DIU
EXT-TTL Yes The source clock is from an external source,
not EQPT or NET signal, at TTL levels.
EXT-442 Yes The source clock is from an external source,
not EQPT or NET signal, at RS422 levels.