Cisco Systems MGX 8260 User's Manual
Contents
1. gt Warning CHAPTER Safety and Compliance This chapter contains important safety guidelines and compliance information that you should read before beginning installation of the MGX 8260 media gateway For additional information refer to Appendix B System Specifications The MGX 8260 is intended for installation in restricted access areas Only trained and qualified personnel should be allowed to install or replace this equipment General Safety Recommendations Follow these guidelines to help ensure your safety and protect the equipment Install the MGX 8260 in compliance with national and local electrical codes In the United States the relevant code is National Fire Protection Association NFPA 70 United States National Electrical Code In Canada it is Canadian Electrical Code part I CC22 1 In other countries you should observe the standards of the International Electrotechnical Commission IEC 364 Parts 1 through 7 Never attempt to lift an object that is too heavy for one person to lift alone Always switch all power supplies off and disconnect all power cables before opening installing or removing a Cisco hardware shelf Keep the area clear and dust free during and after installation Keep tools and chassis components away from walk areas Do not wear loose clothing jewelry including rings and chains or other items that could become trapped in the chassis Fasten your tie or scarf2. is drawn upw ard and into the intake ports of equipment above leading to overtemperature conditions in the chassis at or near the top of the rack Note Allow clearance of 36 inches in front and behind the rack for maintenance and removal of equipment Cabling Considerations gt Caution Consider the equipment and cabling that is already installed in the rack Ensure that cables from other equipment do not obstruct the airflow through the chassis or impair access to the power supplies or switching modules Route cables away from field replaceable components to avoid disconnecting cables unnecessarily when performing equipment maintenance or upgrades To comply with FCC requirements segregate the DC power cables from the signal and I O cables Route the signal and I O cables vertically up or down the rear of the MGX 8260 chassis and route the DC power cables away from the signal and I O cables I 78 10966 02 Cisco MGX 8260 Hardware Installation Guide Chapter2 Safety and Compliance WE Cabling Considerations Cisco M GX 8260 Hardware Installation Guide 26 E 78 10966 02
3. the bottom of the rack If the rack is provided with stabilizing devices install the stabilizers before mounting or servicing the M GX 8260 in the rack Electrical Safety Warnings Follow these basic guidelines when working with any electrical equipment Disconnect all power and external cables before installing or removing a chassis or before beginning any procedure that requires access to the chassis interior Do not work alone when potentially hazardous conditions exist Never assume that power has been disconnected from a circuit always check Do not perform any action that creates a potential hazard to people or makes the equipment unsafe Never install equipment that appears damaged Carefully examine your work area for possible hazards such as moist floors ungrounded power extension cables and missing safety grounds In addition follow these guidelines when working with any equipment that is disconnected from a power source but is still connected to telephone wiring or other network cabling Never install telephone wiring during a lightning storm Never touch noninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface Use caution when installing or modifying telephone lines A Warning OnlyaDC power source that complies w ith the safety extra low voltage SELV requirements of UL 1950 CSA C22 2 No 950 95 EN 60950 and IEC 60950 can be c
4. and roll up your sleeves Be sure to operate the MGX 8260 in accordance with its marked electrical ratings and product usage instructions to guarantee safe operation I 78 10966 02 Cisco MGX 8260 Hardware Installation Guide Chapter2 Safety and Compliance W Moving the Chassis M oving the Chassis Review the following warnings before attempting installation of the MGX 8260 A Warning Make sure that your rack is bolted to the floor before beginning installation of the M GX 8260 into the rack A Warning Never attempt to lift a chassis by yourself The size and weight of a chassis requires two people to lift and move it safely without causing injury or damaging the equipment Ensure that your footing is solid and balance the w eight of the chassis between your feet Lift the chassis slow ly never move suddenly or twist your body as you lift Keep your back straight and lift with your legs not your back If you must bend down to lift the chassis bend at the knees not at the waist to reduce the strain on your lower back muscles Always disconnect all external cables before lifting or moving the chassis A Warning To prevent bodily injury when mounting or servicing this unitin a rack mount the M GX 8260 at the bottom of the rack if the rack will include only one M GX 8260 node If mounting the M GX 8260 ina partially filled rack load the rack from the bottom to the top with the heaviest component at
5. check the resistance value of the antistatic strap The measurement should be between and 10 Mohms e When handling circuit cards or cables make sure the equipment end of your ESD strap is attached to an unfinished chassis surface of the device in which it is housed Do not touch the printed circuit board and avoid contact between the printed circuit board and your clothing Always place circuit boards component side up on an antistatic surface or in a static shielding bag If you are returning the item to the factory immediately place it in a static shielding bag Ensure that all circuit cards are fully inserted into their respective chassis slots the respective extraction levers are in the locked position and the captive installation screws are hand tightened The captive installation screws prevent accidental removal provide proper grounding for the system and help to seat the bus connectors in the receptacles I 78 10966 02 Cisco MGX 8260 Hardware Installation Guide Chapter2 Safety and Compliance W Equipment Location and Environmental Requirements Preventing Interference When wires are run for any significant distance in an electromagnetic field induced interference can distort the signals on the wires The potential presence of interference has two implications for the construction of plant wiring Poor wiring practice can result in radio interference Strong electromagnetic interference EMI esp
6. ecially that caused by lightning radio transmitters or induction start motors can destroy the signal drivers and receivers in servers and controllers EMI can even create an electrical hazard by conducting power line surges For more information on the effects of EMI review the safety guidelines in the Preventing Electrostatic Discharge Damage section on page 2 3 Follow these guidelines to reduce the possibility of extraneous interference and damage from EMI pulses Use twisted pair cable in your plant wiring with good earthing distribution If you must exceed the recommended wiring distances use a high quality twisted pair cable with one ground conductor for each data signal amp Note Shielded twisted pair STP cabling must be used from the rear of the MGX 8260 to the demarcation point for all DS1 spans Coaxial cable must be used from the rear of the MGX 8260 to the demarcation point for all DS3 spans If wires exceed recommended distances or pass between buildings consider the effect of a lightning strike in your vicinity The electromagnetic pulse caused by lightning or other high energy phenomena can easily couple enough energy into unshielded conductors to destroy electronic devices If you have had problems of this sort in the past consider consulting experts in electrical surge suppression and shielding Use dedicated power circuits to feed each Cisco MGX 8260 node If possible avoid tapping master AC power f
7. eeds that also service high current motor driven devices such as air conditioners or elevators Note Refer to the documentation shipped with the Cisco MGX 8260 as well as published interface and wiring standards for detailed requirements Note To predict and remedy strong EMI you might also need to consult experts in radio frequency interference RFI Equipment Location and Environmental Requirements Proper location of the MGX 8260 chassis and careful layout of the equipment rack is essential for successful operation Equipment placed too close together or inadequately ventilated can cause system overtemperature conditions In addition chassis panels made inaccessible by poor equipment placement can make system maintenance difficult For environmental information pertaining to temperature humidity and altitude refer to Table B 3 on page B 2 Cisco M GX 8260 Hardware Installation Guide P24 E 78 10966 02 Chapter2 Safety and Compliance A Warning gt Warning amp Cabling Considerations W To prevent chassis overheating never install the Cisco M GX 8260 in a room thatis not properly ventilated or air conditioned For heat and other environmental specifications refer to Appendix B System Specifications Make sure that your equipment rack has the proper clearances and airflow to ensure adequate ventilation Equipment near the bottom of the rack may generate excessive heat that
8. onnected to an MGX 8260 Cisco M GX 8260 Hardware Installation Guide 22 78 10966 02 Chapter2 Safety and Compliance gt Warning gt Warning Warning gt Warning Electrical Safety Warnings W The MGX 8260 is equipped with a DC power terminal block and requires you to terminate the DC input wiring on a DC source capable of supplying up to 45 amps Double pole 20 amp per pole circuit breakers are required at the 48 VDC power source The MGX 8260 metallic interface connections T1 E1 DS3 must be connected to the netw ork through registered or approved CSU DSUs that provide necessary overvoltage and overcurrent protection per local and national codes and regulations Telcordia GR 1089 CORE Type 2 products Read the installation instructions before you connect the system to its power source When carrying emergency 911 traffic the MGX 8260 must be powered from redundant uninterruptible power sources Preventing Electrostatic Discharge Damage Electrostatic discharge ESD damage occurs when electronic cards or components are improperly handled and can result in complete or intermittent system failures Use an antistatic strap clipped to a grounded rack whenever handling all cards To prevent ESD damage follow these guidelines Always use an ESD wrist strap or ankle strap and ensure that it makes good skin contact Caution For safety periodically
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