NEC UNIVERGE NEAX 2000 IPS General Description Manual

Also see for UNIVERGE NEAX 2000 IPS: Installation guide User guide User guide User guide Reference guide

Contents

NEC UNIVERGE NEAX 2000 IPS General Description Manual Manual pdf 151 page image

CHAPTER 6 INSTALLATION, PROGRAMMING, AND MAINTENANCEUNIVERGE NEAX 2000 IPS General Description Page 147Issue 5Chapter 6 System OverviewOperating EnvironmentOperating Condition Temperature Relative HumidityNormal Operations 5 oC - 30 oC41 oF - 86 oF15% - 65%Non-CondensingShort Periods** -0 oC - 40 oC32 oF - 104 oF15% - 90%Non-CondensingDuring Storage and Transit -18 oC - 50 oC0 oF - 122 oF8% - 90%Non-Condensing**Not to exceed 72 consecutive hours or 15 days in a year.Grounding RequirementsThe system grounding must have a specific ground resistance and AC noise level, and is to beconnected to a predetermined terminal in the PBX. Standard grounding requirements are asshown below: Communication grounding : Less than 10 ohm Protective ground for PIM : Less than 10 ohmNote: The AC ripple on these various grounds should be less than 0.5Vp-p.The following specific requirements apply to ground wiring.An equipment grounding conductor that is at least as large as the ungrounded branch-supplyconductors is to be installed as part of the circuit that supplies the PBX. Bare, covered, orinsulated grounding conductors are acceptable. Individually covered or insulated equipmentgrounding conductors shall have a continuous outer finish that is either green, or green with oneor more yellow stripes. The equipment grounding connector is to be connected to ground at theservice equipment.The attachment-plug receptacles in the vicinity of the PBX are all to be of a grounding type, andthe equipment grounding conductors serving these receptacles are to be connected to earthground at the service equipment.CAUTIONGrounding circuit continuity is vital for safe operation of telecommunicationequipment. Never operate this equipment with the grounding conductor