Specifications

122
SERVSWITCH™ AFFINITY
E.3 Setting the RING/BUS Jumper on an Expansion Card
If you will be installing two or more ServSwitch Affinity units in a ring topology (see
Section 3.4.3.C), you will need to set the RING/BUS jumpers to the RING (off)
setting on the Expansion Cards of any two adjacent Affinity units in the ring (units
one and two, or two and three, or three and four, etc.)
As shown in Figures E-3 and E-4, the RING/BUS jumper is just behind the
OUT-1 port on the card. On 4-User Cards, it’s factory-set to BUS (the jumper
covers both posts), which is the appropriate setting for the regular bus and split-
bus topologies. (At the time of this writing, it’s also factory-set to BUS on 8-User
Cards, but this might change in the future.)
Set the jumper to RING by moving it so that it covers just one of the posts and
leaves the other open. (You could just remove the jumper entirely, but it’s a better
idea to leave it “hanging” on one post so it can be easily set back to BUS if your
system topology changes.) For a 16-User Affinity chassis, you’ll only need to set this
jumper on the unit’s bottom Expansion Card—it handles daisychain topology for
the entire chassis.
Do not set this jumper to RING on only one unit, on more than two units, or on
units that are not adjacent (that is, not directly linked with Expansion Cables).
Figure E-3. The RING/BUS jumper (4-Port Expansion Card shown).
JUMPER OFF - RING
JUMPER ON - BUS