Cisco ASR-920-20SZ-M Hardware Installation Manual
Cisco ASR-920-20SZ-M Aggregation Services Router Hardware Installation Guide
First Published: 2018-09-10
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USA
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Fax: 408 527-0883
©
2018 Cisco Systems, Inc. All rights reserved.
CONTENTS
CHAPTER 1
CHAPTER 2
Safety Warnings 1
Standard Warning Statements 1
Safety Guidelines for Personal Safety and Equipment Protection 2
Safety Precautions for Module Installation and Removal 3
Safety with Electricity 3
Power Supply Considerations 6
Power Connection Guidelines 6
Guidelines for DC-Powered Systems 7
Guidelines for AC-Powered Systems 7
Prevent Power Loss 7
Preventing ESD Damage 7
Overview 9
Features 9
GigabitEthernet Copper Ports 10
GE SFP Ports 11
SFP+ Ports 11
External Interfaces 11
Network Interfaces 11
Network Timing Interfaces 11
External Alarm Inputs 12
Console 12
Auxiliary Console 12
USB Console 12
USB Memory 12
Online Insertion and Removal 13
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Contents
Power Supply and Fans 13
Licensing 14
CHAPTER 3
Prepare for Installation 15
Site Planning 15
General Precautions 15
Site Planning Checklist 15
Site Selection Guidelines 16
Airflow for Site Planning 16
Environmental Requirements 16
Physical Characteristics 17
Airflow Guidelines 17
Floor Loading Considerations 18
Site Power Guidelines 18
Electrical Circuit Requirements 19
Site Cabling Guidelines 19
Asynchronous Terminal Connections 19
Interference Considerations 19
Rack-Mounting Guidelines 20
CHAPTER 4
Precautions for Rack-Mounting 20
Rack Selection Guidelines 20
Receive the Device 21
Unpack and Verify Shipped Contents 23
Tools and Equipment 24
Install the Router 25
Rack Compatibility 25
Rack Types 25
Set up Device on Rack or Wall 27
Rack Mount 27
Install Rack Brackets 27
Set up Device on Rack 32
Attaching the Cable Guides 33
Wall Mount 34
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Install Wall Brackets 34
Wall Mount the Device 35
Ground the Device 36
Connect Power Cables 37
Activate an AC Power Supply 38
Attach Cables to the DC Power Supply 40
Power On the DC Power Supply 41
Connect Gigabit Ethernet Ports 41
Connect SFP Modules 42
Install SFP Modules 42
Remove SFP Modules 43
Connect Fiber Optic SFP Modules 43
Connect RJ-45 Connector 44
Contents
CHAPTER 5
Connect Chassis to Network 44
Connecting Console Cables 44
Connecting to the USB Serial Port Using Microsoft Windows 45
Connecting to the Console Port Using Mac OS X 46
Connecting to the Console Port Using Linux 46
Installing the Cisco USB Device Driver 47
Uninstalling the Cisco USB Device Driver 47
Connecting a USB Flash Device 48
Removing a USB Flash Device 48
Connecting Timing Cables 49
Connecting a Cable to the BITS Interface 49
Connecting Cables to the GPS Interface 49
Connect to EIA Console Port 50
Connect a Management Ethernet Cable 51
Configure the Device 53
Power up the Device 53
Verify the Front Panel LEDs 53
Verify the Hardware Configuration 54
Check Hardware and Software Compatibility 54
Configure Device at Startup 54
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Contents
Access the CLI Using the Console 55
Configure Global Parameters 55
Check the Running Configuration Settings 56
Save the Running Configuration to NVRAM 57
Safely Power Down the Device 57
CHAPTER 6
CHAPTER 7
Replace the Power Supply 59
Remove the DC Power Supply 59
Install the DC Power Supply 60
Remove the AC Power Supply 61
Install the AC Power Supply 62
Troubleshooting Aids 65
Verify Pinout 65
BITS Port Pinouts 65
GPS Port Pinouts 66
Time-of-Day Port Pinouts 66
Alarm Port Pinouts 67
Management Ethernet Port Pinouts 67
USB Console Port Pinouts 68
USB MEM Port Pinouts 68
Check Optical Fiber Specifications 69
Check Alarm Conditions 69
Check LED Indicators 69
PWR and STAT LEDs 70
CPU Management Port LEDs 70
SFP LEDs 71
SFP+ LEDs 71
RJ-45 LEDs 72
Power Supply Unit LEDs 72
System–Interface LED Behavior 72
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Safety Warnings
This handout topic lists the safety warnings necessary for handling this product. Before you install or service
the chassis, review these safety warnings to avoid injuring yourself or damaging the equipment.
For a complete list of translated safety warnings, see the Regulatory Compliance and Safety Information for
the Cisco ASR 920 Series Aggregation Services Router document.
The safety warnings are grouped under the following sections:
• Standard Warning Statements, on page 1
• Safety Guidelines for Personal Safety and Equipment Protection, on page 2
• Safety Precautions for Module Installation and Removal, on page 3
• Safety with Electricity, on page 3
• Power Supply Considerations, on page 6
• Preventing ESD Damage, on page 7
Standard Warning Statements
CHAPTER 1
Warning
Warning
Warning
To prevent bodily injury when mounting or servicing this unit in a rack, you must take special precautions to
ensure that the system remains stable. The following guidelines are provided to ensure your safety: This unit
should be mounted at the bottom of the rack if it is the only unit in the rack. When mounting this unit in a
partially filled rack, load the rack from the bottom to the top with the heaviest component at the bottom of
the rack. If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing
the unit in the rack. Statement 1006
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. Statement 1017
Ultimate disposal of this product should be handled according to all national laws and regulations. Statement
1040
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Safety Guidelines for Personal Safety and Equipment Protection
Safety Warnings
Warning
Warning
Warning
Warning
Warning
To prevent the system from overheating, do not operate it in an area that exceeds the maximum recommended
ambient temperature of 158°F (70°C). Statement 1047
The chassis should be mounted on a rack that is permanently affixed to the building. Statement 1049
IMPORTANT SAFETY INSTRUCTIONS: This warning symbol means danger. You are in a situation that
could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical
circuitry and be familiar with standard practices for preventing accidents. Use the statement number provided
at the end of each warning to locate its translation in the translated safety warnings that accompanied this
device. Statement 1071
This is a Class A Device and is registered for EMC requirements for industrial use. The seller or buyer should
be aware of this. If this type was sold or purchased by mistake, it should be replaced with a residential-use
type. Statement 294
This is a class A product. In a domestic environment this product may cause radio interference in which case
the user may be required to take adequate measures. Statement 340
Warning
This equipment is in compliance with the essential requirements and other relevant provisions of Directive
1999/5/EC. Statement 287
Warning
Suitable for mounting on and over a concrete or other non-combustible surface only. Statement 345
SafetyGuidelines for Personal Safetyand Equipment Protection
The following guidelines ensure your safety and protect the equipment. This list does not include all the
potentially hazardous situations. Therefore, you must be alert.
• Before moving the system, always disconnect all power cords and interface cables.
• Never assume that power is disconnected from a circuit; always check.
• Before and after installation, keep the chassis area clean and dust free.
• Keep tools and assembly components away from walk areas where you or others could trip over them.
• Do not work alone if potentially hazardous conditions exist.
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Safety Warnings
Safety Precautions for Module Installation and Removal
• Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
• Do not wear loose clothing that may get caught in the chassis.
• When working under conditions that may be hazardous to your eyes, wear safety glasses.
Safety Precautions for Module Installation and Removal
Be sure to observe the following safety precautions when you work on the router.
Warning
Warning
Warning
Warning
Class 1 laser product. Statement 1008
Do not stare into the beam or view it directly with optical instruments. Statement 1011
Invisible laser radiation present. Statement 1016
Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or
view directly with optical instruments. Statement 1051
Safety with Electricity
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
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
Avoid using or servicing any equipment that has outdoor connections during an electrical storm.
There may be a risk of electric shock from lightning. Statement 1088
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Safety with Electricity
Safety Warnings
Warning
Warning
Warning
Warning
Warning
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
Read the installation instructions before connecting the system to the power source. Statement 1004
This product relies on the building’s installation for short-circuit (overcurrent) protection. For a DC installation,
ensure that the branch circuit breaker is rated a maximum 15A for DC systems. For AC systems, 15A for
voltages greater than 200Vac; 20A for voltages below 127Vac. Statement 1005
Take care when connecting units to the supply circuit so that wiring is not overloaded. Statement 1018
The plug-socket combination must be accessible at all times, because it serves as the main disconnecting
device. Statement 1019
Warning
Warning
Warning
Warning
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 RJ45 connectors. Use caution when connecting cables. Statement 1021
A readily accessible two-poled disconnect device must be incorporated in the fixed wiring. Statement 1022
To reduce the risk of fire, use only 26 AWG or larger telecommunication line cord. Statement 1023
This equipment must be grounded. Never defeat the ground conductor or operate the equipment in the absence
of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician
if you are uncertain that suitable grounding is available. Statement 1024
Use copper conductors only. Statement 1025
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Safety Warnings
Safety with Electricity
Warning
Warning
Warning
Warning
Warning
This unit might have more than one power supply connection. All connections must be removed to de-energize
the unit. Statement 1028
To prevent personal injury or damage to the chassis, never attempt to lift or tilt the chassis using the handles
on modules (such as power supplies, fans, or cards); these types of handles are not designed to support the
weight of the unit. Statement 1032
Connect the unit only to DC power source that complies with the safety extra-low voltage (SELV) requirements
in IEC 60950 based safety standards. Statement 1033
When installing or replacing the unit, the ground connection must always be made first and disconnected last.
Statement 1046
This equipment must be grounded. Never defeat the ground conductor or operate the equipment in the absence
of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician
if you are uncertain that suitable grounding is available. Statement 1024
Warning
Warning
Installation of the equipment must comply with local and national electrical codes. Statement 1074
Hazardous voltage or energy may be present on power terminals. Always replace cover when terminals are
not in service. Be sure uninsulated conductors are not accessible when cover is in place. Statement 1086
When working on equipment that is powered by electricity, follow these guidelines:
• Locate the room’s emergency power-off switch. If an electrical accident occurs, you know where to
quickly turn off the power.
• Before starting work on the system, turn off the DC main circuit breaker and disconnect the power
terminal block cable.
• Disconnect all power when:
• Working on or near power supplies
• Installing or removing a device chassis or network processor module
• Performing most hardware upgrades
• Never install equipment that appears damaged.
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Power Supply Considerations
Use the following guidelines when working with any equipment that is disconnected from a power source,
but connected to telephone wiring or network cabling:
Safety Warnings
• 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 and you are uninjured:
• Use caution to avoid injuring yourself.
• Turn off power to the device.
• 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 pulsing or external cardiac compressions; then take
appropriate action.
• When installing or modifying telephone lines, use caution.
• Never install telephone jacks in wet locations unless the jack is designed to handle such locations.
• Never install telephone wiring during a lightning storm.
Power Supply Considerations
Check the power at your site to ensure that you are receiving clean power (free of spikes and noise). If
necessary, install a power conditioner.
Power Connection Guidelines
This section provides guidelines for connecting the device power supplies to the site power source.
Warning
Warning
This equipment is intended to be grounded to comply with emission and immunity requirements. Ensure that
the switch functional ground lug is connected to earth ground during normal use. Statement 1064
The plug-socket combination must be accessible at all times, because it serves as the main disconnecting
device. Statement 1019
6
Warning
This product requires short-circuit (overcurrent) protection, to be provided as part of the building installation.
Install only in accordance with national and local wiring regulations. Statement 1045
Cisco ASR-920-20SZ-M Aggregation Services Router Hardware Installation Guide
Safety Warnings
Guidelines for DC-Powered Systems
Basic guidelines for DC-powered systems include the following:
• Each chassis power supply should have its own dedicated input power source. The source must comply
with the safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and
IEC 60950 standards.
• The circuit must be protected by a dedicated two-pole circuit breaker. The circuit breaker should be sized
according to the power supply input rating and local or national code requirements.
• The circuit breaker is considered the disconnect device and should be easily accessible.
• The system ground is the power supply and chassis ground.
• Do not connect the DC return wire to the system frame or to the system-grounding equipment.
• Use the grounding lug to attach a wrist strap for ESD protection during servicing.
Guidelines for AC-Powered Systems
Basic guidelines for AC-powered systems include the following:
• Each chassis power supply should have its own dedicated branch circuit.
• The circuit breaker should be sized according to the power supply input rating and local or national code
requirements.
• The AC power receptacles used to plug in the chassis must be the grounding type. The grounding
conductors that connect to the receptacles should connect to protective earth ground at the service
equipment.
Guidelines for DC-Powered Systems
Prevent Power Loss
Use the following guidelines to prevent power loss to the router:
• To prevent loss of input power, ensure that the total maximum load on each circuit supplying the power
supplies is within the current ratings of the wiring and breakers.
• In some systems, you can use an UPS to protect against power failures at your site. Avoid UPS types
that use ferroresonant technology. These UPS types can become unstable with systems such as the Cisco
ASR 920 Series Router, which can have substantial current-draw fluctuations due to bursty data traffic
patterns.
Determining power requirements is useful for planning the power distribution system needed to support the
router.
Preventing ESD Damage
Warning
This equipment needs to be grounded. Use a green and yellow 6 AWG ground wire to connect the host to
earth ground during normal use. Statement 383
Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. ESD may occur when
electronic printed circuit cards are improperly handled and can cause complete or intermittent failures. When
removing and replacing modules, always follow ESD prevention procedures:
• Ensure that the router chassis is electrically connected to earth ground.
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Preventing ESD Damage
Safety Warnings
• Wear an ESD-preventive wrist strap, ensuring that it makes good skin contact. To channel unwanted
ESD voltages safely to ground, connect the clip to an unpainted surface of the chassis frame. 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.
• When installing a component, use any available ejector levers or captive installation screws to properly
seat the bus connectors in the backplane or midplane. These devices prevent accidental removal, provide
proper grounding for the system, and help to ensure that bus connectors are properly seated.
• When removing a component, use available ejector levers or captive installation screws, if any, to release
the bus connectors from the backplane or midplane.
• Handle components by their handles or edges only; do not touch the printed circuit boards or connectors.
• Place a removed component board side up on an antistatic surface or in a static-shielding container. If
you plan to return the component to the factory, immediately place it in a static-shielding container.
• Avoid contact between the printed circuit boards and clothing. The wrist strap only protects components
from ESD voltages on the body; ESD voltages on clothing can still cause damage.
• Never attempt to remove the printed circuit board from the metal carrier.
Note
For the safety of your equipment, periodically check the resistance value of the antistatic wrist strap. It should
be between 1 and 10 Mohm.
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Features
CHAPTER 2
Overview
The Cisco ASR-920-20SZ-M Router is a fixed configuration router that enables Service Providers to provide
business, residential, and mobile access services to their users. It is the Carrier Ethernet access platform
providing Ethernet services.
• Features, on page 9
• GigabitEthernet Copper Ports, on page 10
• GE SFP Ports, on page 11
• SFP+ Ports, on page 11
• External Interfaces, on page 11
• Power Supply and Fans, on page 13
• Licensing, on page 14
The Cisco ASR 920 Series Router family includes:
• Cisco ASR 920 [ASR-920-20SZ-M]—This sub-family with 1 RU form factor has fixed ENET interfaces
(four 10GE and twenty-four 1GE) and redundant modular power supplies (AC/DC).
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GigabitEthernet Copper Ports
Figure 1: Cisco ASR-920-20SZ-M Top and Front Panel
Overview
The following table provides a snapshot of the number and type of supported ports:
Table 1: Supported Ports on Cisco ASR-920-20SZ-M Router
GigabitEthernet Copper Ports
Fixed copper GigabitEthernet (GE) interfaces are provided through standard RJ-45 connectors. These ports
support the following features:
• Standard 10/100/1000Base-T/TX operation with forced or auto-negotiation for speed and duplex.
• Automatic crossover (auto-MDIX) for straight-through and crossover connections.
• Pause flow control as defined by the 802.3x standard.
• Frame size of 9216 bytes.
• Synchronous ENET operation that provides its recovered receive clock as an input clock source for the
SETS as well as uses the system-wide reference clock to derive its transmit clock.
Type of 10 GE PortType of 1 GE Port10 GE Port1 GE PortASR 920 Sub-family
4 SFP+20 Fiber 4 Copper424ASR-920-20SZ-M
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Overview
GE SFP Ports
The GE SFP ports support the following features:
Note
Copper based SFPs do not support synchronous ENET operations.
GE SFP Ports
• 100Base-FX and 1000Base-X SFP modules.
• Copper SFP modules
• Digital optical monitoring as specified by the SFP.
• Any mix of SFPs is supported unless specifically noted.
• Pause flow control as defined by the 802.3x standard.
• Frame size of 9216 bytes.
• Synchronous ENET operation that provides its recovered receive clock as an input clock source for the
SETS as well as uses the system-wide reference clock to derive its transmit clock.
SFP+ Ports
The SFP+ ports support the following features:
• Digital optical monitoring as specified by the optical transceiver module.
• Any mix of SFPs is supported unless specifically noted.
• Pause flow control as defined by the 802.3x standard.
• Frame size of 9216 bytes.
External Interfaces
The Cisco ASR 920-20SZ-M Router has these external physical interfaces on the front panel:
Network Interfaces
The network interfaces are provided through fixed ports.
• GE SFP ports—supports 100/1000 modes
• GE copper ports—supports 10/100/1000 operation
• 10GE SFP+—supports 10G mode
Network Timing Interfaces
• BITS input or output—The BITS interfaces support clock recovery from either a T1 at 1.544 MHz or an
E1 at 2.048 MHz, configurable by software. BITS interface is provided through a standard RJ-48 connector
on the front panel.
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External Alarm Inputs
• 1PPS input or output and ToD input or output—This shielded RJ-45 interface is used for input or output
of time-of-day (ToD) and 1PPS pulses. ToD format includes both NTP and IEEE 1588-2008 time formats.
The same RS422 pins for 1PPS and TOD are shared between input and output directions. The direction for
each can be independently configurable through software.
Use an SMB connector on the front panel for the following:
• GPS 10 Mhz input and output—10 MHz input for GPS Synchronization.
• GPS 1 PPS input and output—1 PPS input for GPS Synchronization.
External Alarm Inputs
The router supports four dry contact alarm inputs through an RJ-45 jack on the front panel.
• Normally Open—indicates that no current flows through the alarm circuit and the alarm is generated
when the current is flowing.
Each alarm input can be provisioned as critical, major, or minor.
Overview
Console
The RS232 console port provides transmission (Tx), reception (Rx), and ground (Gnd).
Auxiliary Console
The Auxiliary Console port provides transmission (Tx), reception (Rx), and ground (Gnd).
USB Console
A single USB 2.0 Type-A receptacle on the front panel of the router provides console access to ROMMON,
Cisco IOS-XR and diagnostics. While it uses the Type-A connector, it operates as a USB peripheral only for
connection to an external host computer. This interface requires the use of a Type-A to Type-A connector
instead of a standard USB cable.
Note
Use of the USB console is mutually exclusive of the RS232 console port. This interface requires the use of a
Type-A to Type-A USB cable.
USB Memory
A single USB 2.0 Type-A receptacle on the front panel of the router allows external USB mass storage devices,
such as standard USB flash drives. This interface is used to load images, load or store configurations, write
logs, and so on.
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Overview
Note
More than 8 GB is not supported in ROMMON mode.
Online Insertion and Removal
The router supports the following OIR operations:
• When an SFP is removed, there is no effect on traffic flowing on other ports.
• When an SFP is installed, the system initializes that port for operation that is based on the current
configuration. If the inserted SFP is incompatible with the current configuration for that port, the port
does not become operational until the configuration is updated.
• Both power supplies are installed and active, the load may be shared between them or a single PSU could
support the whole load. When a power supply is not working or the input cable is removed, the remaining
power supply takes the entire load without disruption.
Online Insertion and Removal
Power Supply and Fans
The Cisco ASR-920-20SZ-M Router supports a 1+1 redundant configuration with the combination of an AC
and a DC, or two AC, or two DC power supplies. One AC and one DC power supply in the same router is
also a supported configuration. The PSUs are hot-swappable. Load is shared between PSUs when both the
PSUs are inserted and powered-up. Status LED provided on both AC and DC PSU indicates the status and
output condition.
Note
DC PSU can be switched on or off using a switch on the front panel of the DC PSU.
Note
This product requires surge protection as part of the building installation. To comply with the Telcordia
GR-1089 NEBS standard for electromagnetic compatibility and safety, an external surge protective device
(SPD) is required at the AC power service equipment.
Note
For DC systems, if a surge of more than 1KV is expected, add an appropriate external surge protective device.
The Cisco ASR-920-20SZ-M Router has six fixed fans as a part of the system. The system is designed to
operate at its maximum operating temperature of 70ºC and at an altitude of 300 meters. If a single fan fails,
the system runs at a maximum operating temperature of 65ºC. The fan is not removable and therefore, during
a failure, the system must be replaced.
Note
In case of fan failure, we recommend that you get a qualified technician to replace the faulty device within
96 hours.
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Licensing
Licensing
Overview
The Cisco ASR-920-20SZ-M Router support the following types of licenses:
• Port Licensing—Port Upgrade license is available as a "Pay as you Grow" model.
• 1G upgrade license
• 10G upgrade license
• Bulk licensing—Bulk port licensing allows you to enable all the ports with a single license.
• Timing license (1588)—Timing license is required if the router is used as a master clock.
• Advanced Metro IP Access
• Metro IP Access
• Metro Access (default)
The following methods are used to activate the above licenses:
• Cisco Software Licensing—The Cisco Software License Activation feature is a set of processes and
components to activate Cisco software feature sets by obtaining and validating fee-based Cisco software
licenses.
Note
Licenses generated by the Cisco Software Licensing are tied to the UDI of the chassis and a corresponding
watchtower device certificate (WDC) is stored in the system.
• Cisco Smart Licensing—Smart Licensing is usage-based licensing where devices register with the Cisco
Secure server.
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Prepare for Installation
Before you install the router, you must prepare your site for the installation.
Preparing your site involves these tasks:
• Site Planning, on page 15
• Receive the Device, on page 21
Site Planning
The sections describe how to plan for the installation of the Cisco ASR 920 Series Router.
General Precautions
Observe the following general precautions when using and working with your Cisco ASR 920 Router:
• Keep your system components away from radiators and heat sources and do not block cooling vents.
• Do not spill food or liquids on your system components and never operate the product in a wet
environment.
• Do not push any objects into the openings of your system components. Doing so can cause fire or electric
shock by shorting out interior components.
• Position system cables and power supply cable carefully. Route system cables and the power supply
cable and plug so that they are not stepped on or tripped over. Be sure that nothing else rests on your
system component cables or power cable.
• Do not modify power cables or plugs. Consult a licensed electrician or your power company for site
modifications. Always follow your local and national wiring rules.
• If you turn off your system, wait at least 30 seconds before turning it on again to avoid damage of system
components.
CHAPTER 3
Site Planning Checklist
Use the following checklist to carry out all site planning tasks:
• The site meets environmental requirements.
• The site’s air conditioning system can compensate for the heat dissipation of the chassis.
• The floor space that the chassis occupies can support the weight of the system.
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Site Selection Guidelines
• Electrical service to the site complies with the safety with electricity requirements.
• The electrical circuit servicing the chassis complies with the power supply requirements.
• Console port wiring and cabling limitations have been considered in accordance to TIA/EIA-232F.
• The chassis Ethernet cabling distances are within prescribed limits.
• The equipment rack where the chassis is to be installed complies with prescribed requirements.
• When selecting rack location, safety, ease of maintenance, and proper airflow requirements have been
considered.
Site Selection Guidelines
The device requires specific environmental operating conditions. Temperature, humidity, altitude, and vibration
can affect the performance and reliability of the device.
The device is designed to meet the industry EMC, safety, and environmental standards.
Prepare for Installation
Airflow for Site Planning
Table 2: Cisco ASR-920-20SZ-M Airflow
ASR-920-20SZ-M
Environmental Requirements
Environmental monitoring of the chassis protects the system and components from damage due to excessive
voltage and temperature conditions. To ensure normal operation and avoid unnecessary maintenance, plan
and prepare your site configuration before installation. After installation, ensure that the environmental
characteristics continue to be met.
For an outside plant installation (cell site cabinet, hut, and so on), you require to protect the chassis against
airborne contaminants, dust, moisture, insects, pests, corrosive gases, polluted air, or other reactive elements.
We recommend that you install the unit in a fully sealed enclosure or cabinet. Examples of such cabinets
include IP65 cabinets with heat exchanger complying with Telcordia GR487. Temperature must be maintained
within –40ºC to 70ºC.
Place the device inside a space that is protected from direct weather and environmental stresses by an enclosure.
FeatureDevice
power supply
Maximum System Airflow
(CFM) at Maximum System
Temperature
93.020GE SFP, 4Cu and 4-10GE: Modular
Ensure the operating climate as defined by Class 2 of GR-3108-CORE for premium variants.
• –40°C (-40°F) and 70°C (158°F)
• 5 and 85% RH
Ensure the operating climate as defined by Class 1 of GR-3108-CORE for base variants.
• –5°C (23°F) and 50°C (122°F)
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Prepare for Installation
• < 15 to 85% RH
Physical Characteristics
To set the device at its proper location, be familiar with its physical characteristics.
Airflow Guidelines
Cool air is circulated through the chassis by fans that are located along the back of the device.
The internal fans maintain acceptable operating temperatures for the internal components by drawing in cool
air through the vents and circulating that air through the chassis.
The direction of airflow is from front-to-back.
To ensure adequate airflow through the equipment rack, we recommend that you always maintain a minimum
clearance distance as mentioned in the following specifications.
• Front clearance—5 inches (12.7 centimeters)
• Rear clearance—3.93 inches (10 centimeters)
Physical Characteristics
Note the following points:
• When installing chassis in a back-to-back position with another device, ensure a minimum of 3.93 inches
(10 centimeters) airflow clearance between them. Also, ensure that the device behind the chassis is not
installed in a way that it blows air into the chassis.
• An over-temperature condition may occur within the rack, if airflow through the rack and the device is
restricted, or if the air that is drawn into the rack is warm.
• Ensure that the site is dust free. Dust tends to clog the device fans, reducing the flow of cooling air
through the equipment rack and the devices that occupy it, thus increasing the risk of an over-temperature
condition.
• Enclosed racks must have adequate ventilation. Because each device generates heat, ensure that the racks
are not congested. An enclosed rack must have louvered sides and a fan to provide cool air. Heat that is
generated by the equipment near the bottom of the rack may be drawn upward into the intake ports of
the equipment above.
• When mounting a chassis on an open rack, ensure that the rack frame does not block the exhaust fans.
• When a rack-installed equipment fails, especially equipment on an enclosed rack, if possible try operating
the equipment by itself. Power off all other equipment on the rack (and in adjacent racks) to give the
device maximum cooling air and clean power.
• Avoid installing the chassis in a location in which the chassis air intake vents may draw in the exhaust
air from an adjacent equipment. Consider how the air flows through the device; the airflow direction is
from front to back, with ambient air drawn in from the vents located on the sides of the chassis.
Caution
When mounting the device on any type of rack equipment, ensure that the temperature of inlet air to the device
does not exceed the specified operating temperature limits of the product.
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Airflow Guidelines for ETSI Rack Installation
Airflow Guidelines for ETSI Rack Installation
When you install a device on a 2 or 4-post rack, the front and rear doors of the cabinet must be removed. We
recommended that you always maintain a minimum clearance distance as mentioned the following.
• Front clearance—5 inches (12.7 centimeters)
• Rear clearance—3.93 inches (10 centimeters)
To mount the chassis in a 4-post enclosed cabinet, ensure a minimum of 3.93 inches (10 centimeters) of
clearance on each side of the chassis.
Floor Loading Considerations
Ensure that the floor under the rack supporting the chassis is able to support the combined weight of the rack
and all the other installed equipment.
For additional information about floor loading requirements, see the GR-63-CORE, Network Equipment
Building System (NEBS) Requirements: Physical Protection document.
Prepare for Installation
Site Power Guidelines
The chassis has specific power and electrical wiring requirements. Adhering to these requirements ensures
reliable operation of the system. Follow these precautions and recommendations when planning your site
power for the chassis:
• The redundant power option provides a second, identical power supply to ensure uninterrupted power
supply.
• Connect each power supply to a separate input power source. Otherwise, it results in total power failure
to the system due to a fault in the external wiring or a tripped circuit breaker.
• To prevent loss of input power, ensure that the maximum load on each circuit is within the current ratings
of the wiring and the breakers.
• Check the power at your site before installation, and periodically after installation, to ensure that you are
receiving clean power. If necessary, install a power conditioner.
• Provide proper grounding to avoid personal injury and damage to the equipment due to power surges or
lightning striking power lines. The chassis ground must be attached to a central office or other interior
ground system.
Caution
This product requires short-circuit (overcurrent) protection to be provided as part of the building installation.
Install only in accordance with national and local wiring regulations.
Note
The chassis installation must comply with all the applicable codes, and is approved for use with only copper
conductors. The ground bond-fastening hardware must be compatible and preclude loosening, deterioration,
and electrochemical corrosion of hardware and joined material. Attachment of the chassis ground to a central
office or other interior ground system must be made with a 6-AWG gauge wire copper ground conductor.
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