Agilent Technologies 81250, Installation Manual

Page: 17 / 146

ParBERT Components Overview 2 Introduction
Agilent 81250 ParBERT Installation Guide, May 2004 2-5
The E4805B and E4808A clock modules have the same front panel layout.
The E4805B clock module can be used in ParBERT systems that do not
exceed data rates of 2.7 Gbit/s.
Clock to expander frames
Master clock to
data modules
CLOCK/REF INPUT
TRIGGER OUTPUT
EXT INPUT
Deskew probe connector
Outlet for Trigger Pod
ribbon cable
Figure 3 E4805B/E4808A Clock Modules
The E4808A high performance clock module has the same properties as
the E4805B clock module, but superior jitter and noise characteristics. It
can be used for all data modules except the 7 Gbit/s and 13.5 Gbit/s data
modules.
Both modules provide the master clock to up to 11 data modules.
The E4809A clock module is required for systems that contain 7 Gbit/s
and/or 13.5 Gbit/s data modules. It generates not only the system master
clock but also an additional 13 GHz giga clock for these modules.
E4805B/E4808A clock modules
E4809A clock module