Install Guide

NEBS compliance
For your system to be network equipment building system (NEBS) compliant, you must follow the instructions detailed in this
chapter.
To be NEBs compliant, orient your system in the rack so that the air inlet is from the front aisle and the air exhaust is from the
rear aisle.
Topics:
• Important information
Important information
WARNING: The quad form-factor pluggable (QSFP), BaseT, console, Ethernet management, and universal serial
bus (USB) ports are suitable for connection to intra-building or unexposed wiring or cabling only. You MUST
NOT metallically connect the ports to interfaces that connect to the out side plant (OSP) or its wiring. Use
these interfaces as intra-building interfaces only—Type 2 or Type 4 ports as described in GR-1089-CORE,
Issue 6. Also, they require isolation from the exposed OSP cabling. Adding primary protectors is not sufficient
protection to connect these interfaces metallically to OSP wiring.
WARNING: If you install and connect the S4048T-ON to a commercial AC power source, you must connect the
system to an external special protection device (SPD).
WARNING: Use shielded intra-building cabling that is grounded at both ends for the 1/10GbE BaseT intra-
building ports.
To be NEBS compliant, follow these regulations:
● Locate your system in a restricted-access area were only trained personnel are allowed access.
● Install and connect your system to the common bonding network (CBN).
● You can also install and connect your system to the central office.
● Connect the battery returns of your system as DC-I.
● Ground your system using a copper ground conductor.
● Clean and coat all bare grounding connection points on your system with an anti-oxidant solution before making connections.
● Bring all unplated surfaces on your system to a bright finish and treat them with an anti-oxidant solution before making
connections.
● Remove any non-conductive surfaces on your system from the threads and connection points to ensure electrical continuity.
● Use the two-hole, Listed, compression-type lug with an AWG 14 gauge wire that uses 4-in/lb to secure your system to the
frame.
NOTE:
The S4048T-ON can operate at -40.5 to -60 VDC at a maximum current level of 24A or at 100–240 VAC at a
maximum current level of 7.1A.
NOTE: The S4048T-ON is Earthquake Z4-compliant when you attach the ReadyRails to the frame using threaded
hardware. Do not use the tool-less or two-post installation methods.
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