Table Of Contents
Cisco MWR 1941-DC-A Mobile Wireless Edge Router Rack-Mounting Instructions
Product Numbers: MWR 1941-DC-A
This document describes how to rack mount the Cisco MWR 1941-DC-A router and contains the following sections:
Note Use this document in conjunction with the Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide and the Cisco MWR 1941-DC-A Mobile Wireless Edge Router Regulatory Compliance and Safety Information document for your router.
Follow these guidelines to ensure general safety:
•Never wear loose clothing, jewelry (rings, bracelets, or chains), or other items that could get caught in the shelf housing during handling and use.
•Keep the area clear and dust-free during and after installation.
•Keep tools away from walk areas where you or others might fall over them.
•Wear safety glasses when working under any conditions that might be hazardous to your eyes.
•Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
Safety warnings appear throughout this publication in procedures that, if performed incorrectly, might harm you. A warning symbol precedes each warning statement. The safety warnings provide safety guidelines that you should follow when working with any equipment that connects to electrical power or telephone wiring. The warnings include translations in several languages. (See the Cisco Regulatory Compliance and Safety Information for the Cisco MWR 1941-DC-A Mobile Wireless Edge Router for detailed information about compliance guidelines and translated safety warnings.)
Warning Read the installation instructions before connecting the system to the power source. Statement 1004
Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment. Statement 1030
Warning Before working on a chassis or working near power supplies, unplug the power cord on AC units; disconnect the power at the circuit breaker on DC units. Statement 12
Warning Ultimate disposal of this product should be handled according to all national laws and regulations. Statement 1040
Safety with Electricity
Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit. Statement 1003
Warning This unit is intended for installation in restricted access areas. A restricted access area can be accessed only through the use of a special tool, lock and key, or other means of security.
Warning To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telephone-network voltage (TNV) circuits. LAN ports contain SELV circuits, and WAN ports contain TNV circuits. Some LAN and WAN ports both use RJ-45 connectors. Statement 1021
Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and can cause serious burns or weld the metal object to the terminals. Statement 43
Warning Before working on a chassis or working near power supplies, unplug the power cord on AC units; disconnect the power at the circuit breaker on DC units. Statement 12
Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. Statement 1001
Follow these guidelines when working on equipment powered by electricity:
•Locate the room's emergency power-off switch. Then, if an electrical accident occurs, you can quickly turn off the power.
•Before working on the system, turn off the DC main circuit breaker and disconnect the power terminal block cable.
•Disconnect all power before doing the following:
–Working on or near power supplies
–Installing or removing a router chassis or network processor module
–Performing most hardware upgrades
•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.
•Never assume that power is disconnected from a circuit; always check.
•Never perform any action that creates a potential hazard to people or makes the equipment unsafe.
•If an electrical accident occurs, proceed as follows:
–Use caution, and do not become a victim yourself.
–Turn off power to the router.
–If possible, send another person to get medical aid. Otherwise, determine the condition of the victim, and then call for help.
–Determine whether the person needs rescue breathing or external cardiac compressions; then take appropriate action.
In addition, use the following guidelines when working with any equipment that is disconnected from a power source, but still connected to telephone wiring or network cabling:
•Never install telephone wiring during a lightning storm.
•Never install telephone jacks in wet locations unless the jack is specifically designed for it.
•Never touch un-insulated telephone wires or terminals unless the telephone line is disconnected at the network interface.
•Use caution when installing or modifying telephone lines.
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. ESD can occur when electronic printed circuit cards are improperly handled and can cause complete or intermittent failures. Always follow ESD prevention procedures when removing and replacing modules:
•Ensure that the router chassis is electrically connected to earth ground.
•Wear an ESD-preventive wrist strap, ensuring that it makes good skin contact. Connect the clip to an unpainted surface of the chassis frame to channel unwanted ESD voltages safely to ground. To guard against ESD damage and shocks, the wrist strap and cord must operate effectively.
•If no wrist strap is available, ground yourself by touching a metal part of the chassis.
Caution For the safety of your equipment, periodically check the resistance value of the antistatic wrist strap. It should be between 1 and 10 Mohm.
Rack-Mounting Configuration Guidelines
The following information will help you plan your equipment rack configuration:
•When mounting the router to an equipment rack, ensure that the rack is bolted to the floor.
•Because you will probably be installing more than one router into the rack, ensure that the combined weight of all the installed routers does not make the rack unstable.
Caution Some equipment racks are also secured to ceiling brackets, if necessary, due to the weight of the equipment in the rack. Make sure that the rack you are using to install the routers is secured to the building structure.
•Maintain a 6-inch (15.2-cm) clearance at the front and rear of the router to ensure adequate air intake and exhaust.
•Avoid installing the routers in a congested rack. Air flowing to or from other routers in the rack might interfere with the normal flow of cooling air through the routers, increasing the potential for overtemperature conditions within the routers.
•Allow at least 19 inches (48.7 cm) of clearance at the front and rear of the rack for router maintenance.
•Follow your local practices for cable management. Ensure that cables to and from the routers do not impede access for equipment maintenance or upgrades.
Mounting the Cisco MWR 1941-DC-A Router
Typically, each Cisco MWR 1941-DC-A router has had the rack-mounting brackets installed at the factory. If your router did not come with the rack-mounting brackets installed, the rack-mounting bracket kit may have been separately packaged with your router (see Required Tools and Equipment section on this page). You can only front (flush) mount the Cisco MWR 1941-DC-A router in a 19-inch (48.3-cm) equipment rack that conforms to the EIA-310-D specification (the inside width of the rack should be 17.72 to 17.80 inches [45 to 45.21 cm]). Mount the Cisco MWR 1941-DC-A router to the brackets as described in the "Attaching the Rack-Mounting Brackets" section. The rack-mount brackets are slotted to allow the router to be mounted in racks with EIA 1.25-inch (3.81-cm) or WECO 1.0-inch (2.54-cm) hole spacing. When installed in the rack, the Cisco MWR 1941-DC-A router requires one EIA 1.75-inch (4.4-cm) vertical mounting space (or 1 rack unit [RU]) for mounting.
Caution Clearance in the front and rear of the Cisco MWR 1941-DC-A router must be allowed for cooling air to be drawn in through the left and right front sides and circulated through the chassis and out the four fan exhaust ports mounted on the rear of the chassis.
Required Tools and Equipment
In addition to the rack-mounting brackets, you will need the following tools and equipment to rack-mount the router:
Warning Only trained and qualified personnel should be allowed to install or replace this equipment.
•ESD-preventive cord and wrist strap.
•Number 2 Phillips screwdriver.
•Flat-blade screwdrivers: small, 3/16-inch (0.476 cm) and medium, 1/4-inch (0.625 cm).
–To install or remove modules
–To remove the cover, if you are upgrading memory or other components
•#12-24 pan-head screws to secure the router to your equipment rack.
•Cables for connection to the 2-port T1/E1-RAN ports.
Note For more information on cable specifications, see "Cable Specifications," of the Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide.
•Ethernet hub or PC with a network interface card for connection to the Ethernet (LAN) port(s).
•Console terminal (an ASCII terminal or a PC running terminal emulation software) that is configured for 9600 baud, 8 data bits, no parity, and 2 stop bits.
•Modem for connection to the auxiliary port for remote administrative access (optional).
•Console cable for connection to the console port. You can supply this cable yourself or order one from Cisco Systems, Inc. (part number ACS-1900ASYN=).
•Ratcheting torque screwdriver with a Phillips head that exerts up to 15 pound-force inches (lbf-in) of pressure.
•Crimping tool as specified by the ground lug manufacturer.
•10-AWG copper ground wire (insulated or non-insulated).
•#6, ring-style ground lug.
•18-AWG copper wire for the power cord.
•Wire-stripping tool(s) for stripping both 10- and 18-AWG wire.
Attaching the Rack-Mounting Brackets
You rack-mount a Cisco MWR 1941-DC-A router with the front of the chassis facing forward. The rack-mounting brackets and six #8-32 x 0.37-inch screws are provided in a rack-mounting bracket kit (Cisco part number 69-0791-01). Use a Number 2 Phillips screwdriver to install the rack-mounting bracket screws.
Perform the following procedure to front (flush) mount the Cisco MWR 1941-DC-A router to the rack-mounting brackets for a 19-inch (48.3-cm) equipment rack.
Step 1 Locate the mounting holes on the Cisco MWR 1941-DC-A router for mounting (see Figure 1).
Step 2 Align the rack-mounting bracket with the Cisco MWR 1941-DC-A router and position with the three
#8-32 x 0.37-inch screws (provided).
Step 3 Insert the screws (three places) and tighten them using a Number 2 Phillips screwdriver.
Step 5 You are now ready to install the Cisco MWR 1941-DC-A router into the equipment rack.
Figure 1 Attaching the Bracket
Proceed to the next section, "Mounting the Cisco MWR 1941-DC-A Router in a Rack" to continue the installation.
Mounting the Cisco MWR 1941-DC-A Router in a Rack
Typically, the Cisco MWR 1941-DC-A router mounts to a 19-inch (48.3-cm) two-post equipment rack with rack-mounting brackets that attach to the front sides of the router. The inside width between the two posts or mounting strips (left and right) must be at least 17.5 inches (44.45 cm).
Even though the inlet and exhaust ports for cooling air are located on the left and right front sides and on the rear of the Cisco MWR 1941-DC-A router, respectively, it is recommended that multiple routers be stacked in a rack with at least a 1-inch (2.54-cm) vertical clearance. This is due to the location of the AIM-ATM daughter card in the router and the tendency of the power cables to press on the AIM-ATM location when installed.
To secure the Cisco MWR 1941-DC-A router to the equipment rack, you must use the four mounting screws (provided) for each side, or follow your local practices for installing the router into your equipment rack. Ensure that the rack-mounting brackets have been securely fastened (see the "Attaching the Rack-Mounting Brackets" section for more information.
To mount the Cisco MWR 1941-DC-A router into the equipment rack, perform the following procedure.
Caution To prevent injury, review the "Safety Warnings" section and the "Rack-Mounting Configuration Guidelines" section before installing the Cisco MWR 1941-DC-A router in the equipment rack.
Step 1 Locate the equipment rack position you plan to install the Cisco MWR 1941-DC-A router into.
Step 2 Verify that there are no obstructions and ensure that the equipment rack is stabilized.
Step 3 Position the Cisco MWR 1941-DC-A router in the equipment rack lining up the bracket holes on the router with the holes on the rack and secure with four #12-24 x 0.37-inch mounting screws (each side).
Note The vertical spacing for EIA equipment racks is 1.75 inches (4.44 cm), with mounting holes spaced 1.5 inches (3.81 cm) apart. Vertical spacing for WECO racks is 2.0 inches (5.08 cm), with mounting holes spaced 1.0 inch (2.54 cm) apart.
Step 4 Tighten the screws on each side by using a 1/4-inch flat-blade screwdriver.
Related Product Documentation
You can now install the NM-2W network module and the Cisco 2-port T1/E1-RAN interface cards and make network connections. For instructions, see these publications:
•Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide
•Network Modules Quick Start Guide
•Cisco Network Modules Hardware Installation Guide
•Cisco Interface Cards Installation Guide
•Cisco 2-port T1/E1-RAN Installation Instructions
•Cisco MWR 1941-DC-A Mobile Wireless Edge Router Software Configuration Guide
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