Rear panel

Table 1. Rear panel descriptions
Number	Item	Comments
1	Power supply 1	Standard on Base Module Optional on Expansion Module (required if drives are present)
2	Power supply 2	Optional on Base Module and Expansion Modules
3	Tape drive bays	Full high drives take up 2 bays and can only be installed in the lower two drive bays.
4	Upper Expansion Module connection port
5	USB port	Base Module only
6	Ethernet port B	Base Module only (secondary port for service usage)
7	Ethernet port A	Base Module only
8	Module alignment mechanism
9	Lower Expansion Module connection port
10	Unit Identifier LED, Blue
11	Controller Error LED, Yellow
12	Controller Health Status LED, Green
13	Product Serial Number, Tag location