User manual

Wide Bank 28 DS3 - Release 2.4 July 2004 10-7
Maintenance
Replacing Low-Speed Cards
Replacing an MSO Low-Speed Card
The Maintenance Service Option allows hot-swapping a low-speed card
without dropping the circuits carried by that card. This is accomplished by
removing only the electronics section of the two-section MSO card, leaving
the relay section of the MSO card fully seated and latched in the card slot,
as shown in Figure 10-4. Removing the relay section of the MSO card will
drop the circuits carried by the card, just like removing a standard low-speed
card.
Figure 10-4 MSO Electronics and MSO Relay Sections
The MSO card has two card ejector latch levers, a white one (the upper one) and a red one (the lower
one). See Figure 10-6 and Figure 10-5 on the following pages. The white ejector latches the
electronics section of the card to the relay section. The red ejector latch holds both the relay section
and the electronics section of the card in the slot position.
MSO card assembly,
comprising MSO Electronics
section and MSO Relay
With MSO Relay section
installed in chassis, the
MSO Electronics section
can be removed without
interrupting service.
section, replaces standard
low-speed circuit card.