38 | S55 Specifications
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DC Power Requirements
IEEE Standards
The S55 complies with the following IEEE standards:
• 802.3ae 10 Gigabit Ethernet
• 802.3ab 1000Base-T
• 802.1p L2 Prioritization
• 802.1Q VLAN Tagging, Double VLAN Tagging (Q in Q), GVRP
• 802.1s Multiple Spanning Tree Protocol
• 802.1w Rapid Spanning Tree Protocol
• 802.3ad Link Aggregation with LACP
• 802.1D Bridging, GARP, GMRP
• 802.3x Flow Control
• 802.1ac Frame Extension for VLAN tagging
• 802.1x Port based Network Access Control
Agency Compliance
The S55 is designed to comply with the following safety and agency requirements.
NEBS (Network Equipment Building Systems) Compliance
• Shielded cables must be used for ports 0 - 43.The shields must be grounded at both ends.
• Only reverse air flow configurations may be used in a NEBS compliant installation. Use only AC
supply S55-PWR-AC-R, DC supply S55-PWR-DC-R and Fan Only S55-FAN-R, Systems S55-44T-
AC-R and S55-44T-DC-R.
• Power supplies and fan modules must be fitted with the S55-PWR-FLTR kits. Fan filters must be
replaced on a regular basis.
• This equipment is intended to be used with an external second-level 6kV lightning SPD (Surge
Protective Device) at the AC input of the building.
• For the NEBS compliant installation, AC power connections shall use a SPD (surge protection device)
in order to protect the AC power supplies from damage to excessive power line surges.
Parameter Specifications
Nominal Input Voltage -43 to -72 VDC at startup
-36 to -72 VDC during normal operation
Maximum Power Supply Input Current 10 A
Maximum System Power Input 135 W
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