Cobalt Digital FUSION 3G 9921-FS 3G_HD_SD Frame Sync - Manual (Page 29)

9921-FS-OM (V1.15) 9921-FS PRODUCT MANUAL 1-25
Introduction
9921-FS Functional Description
For some card options, a piggyback card is mounted to the main 9921-FS
card. Occupying two card slots, the connections for the functions offered by
the piggyback card are broken out using an expansion module (which is
installed adjacent to the base card rear module slot). When an expansion rear
module is used, the base rear module mates with the base Fusion3G® card,
and the expansion rear module mates with the expansion piggyback card that
is piggyback-installed on the base card.
Figure 1-12 shows a 9921-FS card using an RM20-9921-B base rear module
along with an analog audio expansion rear module.
Figure 1-12 9921-FS with Expansion Rear Module
RM20-9921-B Base Rear Module provides connection
break-out for base card functions. Expansion Rear Module RM20-9921-XD installs on slot
directly to the left of base Rear Module, and interfaces
with the piggyback card. In this example, an expansion
rear module breaks out optional analog video/audio
connections.
Expansion rear modules are always identifed with an “-X”
in the module part number.
REAR VIEW OF FRAME