(2 to 82m), OM3 1500 MHz (2 to 300m), or OM 4 3500 MHz (2 to 400m) SFP+ optical
cable.
3. For 25 GbE-SFP28 connections, use optical cables that support the 25GBASE-SR standard
to connect to the 25 GbE-SFP28 optical transceivers.
4. For 100 GbE connections, use copper direct attach (DAC) cables up to 5 m, or active optical
cables up to 30 m.
5. For 25 GbE-SFP28 connections, use optical cables that support the 25GBASE-SR standard
to connect to the 25 GbE-SFP28 optical transceivers.
6. For FC connections, use a qualified OM1, OM2, or OM3 Fibre Channel optical cable:
For 100GbE QSFP28 direct attach copper (DAC) connections, use DAC cables up to 5m
Table 12 Maximum FC cable lengths
Data rate OM1 maximum
length
OM2 maximum
length
OM3 maximum
length
4 Gbps 70m 150m 380m
8 Gbps 21m 50m 150m
16 Gbps 15m 35m 100m
Connecting disk shelf power cables
Before you begin
Each disk shelf has two power supplies. Connect each power supply to redundant AC power
sources, so the loss of one power supply does not cause the shelf to power off.
About this task
ES40 and FS25 shelves have one power cord per power supply for a total of two power cords.
DS60 shelves have two power cords per power supply for a total of four power cords.
Procedure
1. Plug the power cords into both power supplies on the disk shelf.
2. If the disk shelf has a retention bail, secure the power cord with the retention bail. The bail
prevents the power cord from pulling out of the connector.
3. Connect each power cord to separate power sources in the rack.
4. Repeat the preceding steps for each shelf in the rack.
Connecting controller power cables and powering on
Procedure
1. Connect the power supply units to the rack.
CAUTION
Connect each PSU to a redundant AC power source. Redundant power
sources allow one AC source to fail or be serviced without impacting system operation.
Connect PSU 0 to one AC source, and PSU 1 to the other AC source.
The system may not power on automatically after plugging in the AC power cords. The
system identification button located on the rear of the chassis, on the lower left-hand side
illuminates blue when power is on.
Connect Cables and Power On
68 Dell EMC PowerProtect DD9900 System Installation Guide
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