• 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.
Airflow for Site Planning
Table 2: Cisco ASR-920-20SZ-M Airflow
Maximum System Airflow
(CFM) at Maximum System
Temperature
Feature
Device
93.0
20GE SFP, 4Cu and 4-10GE: Modular
power supply
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.
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)
Cisco ASR-920-20SZ-M Aggregation Services Router Hardware Installation Guide
16
Prepare for Installation
Site Selection Guidelines
