Juniper SRX5800 Hardware Manual page 70

Figure 25: SRX5K-SCB
The SRX5800 Services Gateway has two SCBs installed and you can install a third SCB for switch fabric
redundancy.
NOTE: The SRX5800 Services Gateway supports a redundant SCB, provided the SCB is a
SRX5K-SCBE (SCB2) running Junos OS Release 12.1X47-D15 and later, SRX5K-SCB3 (SCB3)
running Junos OS Release 15.1X49-D10 and later, or a SRX5K-SCB4 (SCB4) running Junos OS
Release 19.3R1 and later.
The SRX5800 Services Gateway does not support a redundant SCB (third SCB) card if
SRX5K-SPC-4-15-320 (SPC2) is installed with SCB1 (SRX5K-SCB). If you have installed a SPC2
on a SRX5800 Services Gateway with a redundant SCB1 card, make sure to remove the redundant
SCB1 card.
SCBs install vertically into the front of the chassis. The SCB slots are located at the middle of the card cage
and are labeled 0, 1, and 2/6. If any slots are empty, you must install a blank panel.
SCBs installed in slots 0 and 1 provide nonredundant fabric connections. A SCB installed in slot 2/6, in
conjunction with SCBs in slots 0 and 1, provides redundant fabrics. If no SCB is installed in slot 2/6, you
must install a blank panel in the slot (see Table 27 on page 72).
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