Arbitration Termination Board; Connectors; Led Indicators; Table 3-16 Atb Led Definition - Sun Microsystems StorEdge A7000 Service Manual

3.12

Arbitration Termination Board

The Arbitration Termination Board (ATB) (part number 501-5076-xx) is a 6U VME
PCB. The ATB resides in any 6U external frame slot in the RDC FORM chassis. This
chassis is installed inside the I/O bay cabinet.
3.12.1

Connectors

FIGURE 3-38
J1, J2, J3, and J4, MEMORY CHANNEL (MC) bus connectors—four connectors for
the MC Bus Data, Address, Control, and Expansion cables; see also Section 3.3
"Cache Memory Card" on page 3-10:
Power connector—the ATB card requires +5 volts from the system power supply.
FIGURE 3-39
3.12.2

LED Indicators

The ATB faceplate has nine LED indicators. See
TABLE 3-16
TABLE 3-16
LED
PWR
PRIM
ENABL
ACTV
3-64 Sun StorEdge A7000 Service Manual • August 1999
shows the ATB connectors.
J1—address/data
J2—address/data
J3—control
J4—arbitration/expansion
shows the details of the power connector
.
ATB LED Definition
When Lighted, Indicates...
DC Power is OK
This arbiter is a candidate for Primary Arbiter. When the LED is off,
the arbiter is a Secondary Arbiter
This arbiter has the Arbiter enable jumper installed (location D4A4)
and is not in test mode. This arbiter is the Primary or Secondary
Arbiter as determined by the Primary Arbiter jumper (location
D4A2) and the state of the failover logic
This arbiter is the Active arbiter. Only one Active arbiter is allowed
per MC Bus. One of two arbiters must be active. Power on causes
the Primary Arbiter to be selected as the Active arbiter
shows the card layout.
FIGURE 3-38
,
FIGURE 3-29 FIGURE 3-38
, and