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Environmental Requirements and Specifications for EX Series Switches
Clearance Requirements for Airflow and Hardware Maintenance for an EX8208 Switch
Calculating the Power Consumption of Your EX8208 Switch Configuration
Calculating System Thermal Output for Your EX8208 Switch Configuration
Calculating the Number of Power Supplies Required for Your EX8208 Switch Configuration
EX8208 Site Guidelines and Requirements
Environmental Requirements and Specifications for EX Series Switches
The switch must be installed in a rack or cabinet housed in a dry, clean, well-ventilated, and temperature-controlled environment.
Ensure that these environmental guidelines are followed:
The site must be as dust-free as possible, because dust can clog air intake vents and filters, reducing the efficiency of the switch cooling system.
Maintain ambient airflow for normal switch operation. If the airflow is blocked or restricted, or if the intake air is too warm, the switch might overheat, leading to the switch temperature monitor shutting down the switch to protect the hardware components.
Table 1 provides the required environmental conditions for normal switch operation.
Table 1: EX Series Switch Environmental Tolerances
Switch or device | Environment Tolerance | |||
---|---|---|---|---|
Altitude | Relative Humidity | Temperature | Seismic | |
EX2200-C | No performance degradation up to 5,000 feet (1524 meters) | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) | Normal operation ensured in the temperature range 32° F (0° C) through 104° F (40° C) at altitudes up to 5,000 ft (1,524 m). For information about extended temperature SFP transceivers supported on EX2200 switches, see Pluggable Transceivers Supported on EX2200 Switches. | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX2200 (except EX2200-C switches) | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) | Normal operation ensured in the temperature range 32° F (0° C) through 113° F (45° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX2300-C | No performance degradation up to 5,000 feet (1524 meters) | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) | Normal operation ensured in the temperature range 32° F (0° C) through 104° F (40° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX2300 (except EX2300-C switches) | No performance degradation up to 13,000 feet (3962 meters) at 104° F (40° C) as per GR-63 | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) | Normal operation ensured in the temperature range 32° F (0° C) through 113° F (45° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX3200 | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) | Normal operation ensured in the temperature range 32° F (0° C) through 113° F (45° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX3300 | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) | Normal operation ensured in the temperature range 32° F (0° C) through 113° F (45° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX3400 | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) | Normal operation ensured in the temperature range 32° F (0° C) through 113° F (45° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX4200 | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) | Normal operation ensured in the temperature range 32° F (0° C) through 113° F (45° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX4300 | EX4300 switches except the EX4300-48MP model— No performance degradation up to 10,000 feet (3048 meters) EX4300-48MP model— No performance degradation up to 6,000 feet (1829 meters) | EX4300 switches except the EX4300-48MP model— Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) EX4300-48MP model— Normal operation ensured in the relative humidity range 5% through 90% (noncondensing) | Normal operation ensured in the temperature range 32° F (0° C) through 113° F (45° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX4500 | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) | Normal operation ensured in the temperature range 32° F (0° C) through 113° F (45° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX4550 | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) |
| Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX4600 | No performance degradation to 6,562 feet (2000 meters) | Normal operation ensured in the relative humidity range 5% through 90%, noncondensing
|
| Designed to comply with Zone 4 earthquake requirements per NEBS GR-63-CORE, Issue 4. |
EX4650 | No performance degradation to 6,000 feet (1829 meters) | Normal operation ensured in the relative humidity range 10% through 85% (condensing) | Normal operation is ensured in the temperature range 32° F (0° C) through 104° F (40° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX6210 | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) | Normal operation is ensured in the temperature range 32° F (0° C) through 104° F (40° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX8208 | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) | Normal operation is ensured in the temperature range 32° F (0° C) through 104° F (40° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX8216 | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) | Normal operation is ensured in the temperature range 32° F (0° C) through 104° F (40° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
EX9204 | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 5% through 90% (noncondensing) | Normal operation is ensured in the temperature range 32° F (0° C) through 104° F (40° C) Nonoperating storage temperature in shipping container: – 40° F (–40° C) to 158° F (70° C) | Complies with Zone 4 earthquake requirements as per GR-63. |
EX9208 | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 5% through 90% (noncondensing) | Normal operation is ensured in the temperature range 32° F (0° C) through 104° F (40° C) Nonoperating storage temperature in shipping container: – 40° F (–40° C) to 158° F (70° C) | Complies with Zone 4 earthquake requirements as per GR-63. |
EX9214 | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 5% through 90% (noncondensing) | Normal operation is ensured in the temperature range 32° F (0° C) through 104° F (40° C) Nonoperating storage temperature in shipping container: – 40° F (–40° C) through 158° F (70° C) | Complies with Zone 4 earthquake requirements as per GR-63. |
EX9251 The maximum thermal output is 1705 BTU/hour (500 W). | No performance degradation up to 10,000 ft (3048 m) | Normal operation ensured in relative humidity range of 5% to 90%, noncondensing | Normal operation ensured in temperature range of 32° F (0° C) to 104° F (40° C) Nonoperating storage temperature in shipping container: – 40° F (–40° C) to 158° F (70° C) | Complies with Telcordia Technologies Zone 4 earthquake requirements |
XRE200 | No performance degradation up to 10,000 feet (3048 meters) | Normal operation ensured in the relative humidity range 10% through 85% (noncondensing) | Normal operation ensured in the temperature range 41° F (5° C) through 104° F (40° C) | Complies with Zone 4 earthquake requirements as per GR-63, Issue 4. |
Install EX Series switches only in restricted areas, such as dedicated equipment rooms and equipment closets, in accordance with Articles 110– 16, 110– 17, and 110– 18 of the National Electrical Code, ANSI/NFPA 70.
General Site Guidelines
Efficient device operation requires proper site planning and maintenance and proper layout of the equipment, rack or cabinet (if used), and wiring closet.
To plan and create an acceptable operating environment for your device and prevent environmentally caused equipment failures:
Keep the area around the chassis free from dust and conductive material, such as metal flakes.
Follow prescribed airflow guidelines to ensure that the cooling system functions properly and that exhaust from other equipment does not blow into the intake vents of the device.
Follow the prescribed electrostatic discharge (ESD) prevention procedures to prevent damaging the equipment. Static discharge can cause components to fail completely or intermittently over time.
Install the device in a secure area, so that only authorized personnel can access the device.
Site Electrical Wiring Guidelines
Table 2 describes the factors you must consider while planning the electrical wiring at your site.
It is particularly important to provide a properly grounded and shielded environment and to use electrical surge-suppression devices.
Table 2: Site Electrical Wiring Guidelines
Site Wiring Factor | Guidelines |
---|---|
Signaling limitations | If your site experiences any of the following problems, consult experts in electrical surge suppression and shielding:
|
Radio frequency interference | To reduce or eliminate RFI from your site wiring, do the following:
|
Electromagnetic compatibility | If your site is susceptible to problems with electromagnetic compatibility (EMC), particularly from lightning or radio transmitters, seek expert advice. Some of the problems caused by strong sources of electromagnetic interference (EMI) are:
|
Clearance Requirements for Airflow and Hardware Maintenance for an EX8208 Switch
When planning the site for installing an EX8208 switch, you must allow sufficient clearance around the switch.
To manage airflow in a hot-aisle--cold-aisle data center setup, you might want to use the customized rack solution for EX8200 switches offered by Chatsworth Products, Inc.
Allow at least 6 in. (15.2 cm) of clearance on each side of the chassis. For the cooling system to function properly, the airflow around the chassis must be unrestricted. See Figure 1.
Figure 1: Airflow Through the EX8208 Switch Chassis If you are mounting the switch on a rack or cabinet along with other equipment, ensure that the exhaust from other equipment does not blow into the intake vents of the chassis.
Leave at least 24 in. (61 cm) both in front of and behind the switch. Allow at least 6 in. (15.2 cm) of clearance on each side of the chassis. Leave adequate space at the front of the switch for service personnel to remove and install hardware components. NEBS GR-63 recommends that you allow at least 30 in. (76.2 cm) in front of the rack or cabinet and 24 in. (61 cm) behind the rack or cabinet. See Figure 2.
Figure 2: Clearance Requirements for Airflow and Hardware Maintenance for an EX8208 Switch Chassis
See also
Rack Requirements
You can mount the device on two-post racks or four-post racks.
Rack requirements consist of:
Rack type
Mounting bracket hole spacing
Rack size and strength
Rack connection to the building structure
Table 3 provides the rack requirements and specifications.
Table 3: Rack Requirements and Specifications
Rack Requirement | Guidelines |
---|---|
Rack type | You can mount the device on a rack that provides bracket holes or hole patterns spaced at 1 U (1.75 in. or 4.45 cm) increments and meets the size and strength requirements to support the weight. A U is the standard rack unit defined by the Electronic Components Industry Association (http://www.ecianow.org). |
Mounting bracket hole spacing | The holes in the mounting brackets are spaced at 1 U (1.75 in. or 4.45 cm), so that the device can be mounted in any rack that provides holes spaced at that distance. |
Rack size and strength |
|
Rack connection to building structure |
|
Cabinet Requirements
You can mount the device in a cabinet that contains a 19-in. rack.
Cabinet requirements consist of:
Cabinet size
Clearance requirements
Cabinet airflow requirements
Table 4 provides the cabinet requirements and specifications.
Table 4: Cabinet Requirements and Specifications
Cabinet Requirement | Guidelines |
---|---|
Cabinet size |
|
Cabinet clearance |
|
Cabinet airflow requirements | When you mount the device in a cabinet, ensure that ventilation through the cabinet is sufficient to prevent overheating.
|
Power Requirements for EX8208 Switch Components
Table 5 lists the power requirements for different hardware components of an EX8208 switch under typical voltage conditions.
Table 5: EX8208 Switch Component Power Requirements
Components | Power Requirements (Watts) |
---|---|
Fan tray |
|
Switch Fabric and Routing Engine (SRE) module | 200 W |
Switch Fabric (SF) module | 100 W |
8-port SFP+ line card (including optical transceivers) | 450 W |
40-port SFP+ line card (including optical transceivers) | 550 W |
EX8200-2XS-40P line card (including optical transceivers) | 387 W |
EX8200-2XS-40T line card (including optical transceivers) | 350 W |
EX8200-48PL line card | 267 W |
EX8200-48TL line card | 230 W |
48-port SFP line card (including optical transceivers) | 330 W |
48-port RJ-45 line card | 350 W |
Calculating Power Requirements for an EX8208 Switch
Use the information in this topic to calculate power consumption, system thermal output, and number of power supplies required for different EX8208 switch configurations.
Before you begin these calculations:
Ensure you understand the different switch configurations. See EX8208 Switch Configurations.
Ensure that you know the power requirements of different switch components. See Power Requirements for EX8208 Switch Components.
If the switch contains PoE line cards, ensure that you understand the PoE power budget requirements of each line card. See Understanding PoE on EX Series Switches.
This topic describes these tasks.
Calculating the Power Consumption of Your EX8208 Switch Configuration
Use the following procedure to determine the maximum power you need to supply to the switch. To calculate maximum system power consumption, you first determine the combined maximum internal power requirements of all the switch components and then divide this result by the power supply efficiency.
To calculate maximum system power consumption:
- Determine the maximum power consumption of the base chassis
components (that is, the components other than the line cards):
Use Table 6 if your switch is configured for N+1 power redundancy or if your switch is configured for N+N power redundancy and is running Junos OS Release 10.1 or earlier.
Use Table 7 only if your switch is running Junos OS Release 10.2 or later and power management is configured for N+N power redundancy.
Note In Junos OS Release 10.2 or later, if power management is configured for N+N redundancy, the maximum fan speed is lowered, reducing the chassis’ maximum power consumption.
Table 6: Chassis Power Consumption for N+1 Configurations and for N+N Configurations Running Junos OS Release 10.1 or Earlier
Chassis Component
Base Configuration
Redundant Configuration
Fan tray
1100 W
1100 W
Switch Fabric and Routing Engine (SRE) module
200 W
200 W
Second SRE module
—
200 W
Switch Fabric module
100 W
100 W
Total
1400 W
1600 W
Table 7: Chassis Power Consumption for N+N Configurations Running Junos OS Release 10.2 or Later
Chassis Component
Base Configuration
Redundant Configuration
Fan tray
700 W
700 W
SRE module
200 W
200 W
SRE module
—
200 W
SF module
100 W
100 W
Total
1000 W
1200 W
- Calculate the maximum internal power consumption of the
entire switch by adding in the power requirements of each line card.
For example, for a switch fully loaded with 8-port SFP+ line cards and using N+1 power redundancy, the maximum internal power consumption:
= (chassis watts) + 8 (8-port SFP+ line card watts)
= (1600 W + 8 (450 W))
= (1600 W + 3600 W)
= 5200 W
For switches with PoE line cards, be sure to include the configured PoE power budget for each line card.
- Calculate the maximum system power consumption by dividing
the maximum internal power consumption by the efficiency of the power
supply. This accounts for the loss of energy within the power supply.
Note The efficiency of a 2000 W AC power supply is approximately 90 percent when input is high-voltage line (200–240 VAC).
The efficiency of a 2000 W AC power supply is approximately 87 percent when input is low-voltage line (100–120 VAC).
For example, for a switch fully loaded with 8-port SFP+ line cards and using N+1 power redundancy with high-voltage line input, the maximum system power consumption:
= (maximum internal power consumption) / (power supply efficiency)
= (5200 W) / (0.90)
= 5778 W
Calculating System Thermal Output for Your EX8208 Switch Configuration
Use the following procedure to calculate the system thermal output in British thermal units (BTU) per hour for your switch configuration.
To calculate the system thermal output:
- Determine the maximum system power consumption of your switch in watts. See Calculating the Power Consumption of Your EX8208 Switch Configuration for how to do so.
- Multiply the maximum system power consumption by 3.41.
For example, for a switch fully loaded with 8-port SFP+ line cards and using N+1 power redundancy with high-voltage line input, the system thermal output:
= (maximum system power consumption) x (3.41)
= (5778 W) x (3.41) =
= 19,703 BTU/hr
Using the maximum system power consumption values to calculate the system thermal output often results in overprovisioning the cooling systems. Typical power consumption is about one-third lower than these calculated values.
Calculating the Number of Power Supplies Required for Your EX8208 Switch Configuration
Use this procedure to calculate the number of power supplies required by your switch configuration. The required power configuration for EX8208 switches is N+1. You can optionally configure your switch for N+N configuration. For example, you might want dual power feed redundancy with AC power supplies, which requires an N+N configuration.
To calculate the number of power supplies required for your switch configuration:
- Determine the power requirement of the base chassis (that
is, the combined power requirements of the fan tray, SRE module or
modules, and the SF module) by consulting Table 8.
The watt values shown in Table 8 are the amount of power reserved by power management for the chassis in its power budget. It uses these values when calculating used and available power and when determining whether sufficient power exists to meet N, N+1, or N+N requirements.
Starting with Junos OS Release 10.2, when power management is configured for N+N power redundancy, it reserves less power for the chassis so that more power is available for line cards.
Table 8: Power Reserved for the Chassis
Junos OS Release 10.1 or Earlier
Junos OS Release 10.2 or Later
N+1 Configuration
1600 W
1600 W
N+N Configuration
1600 W
1200 W
Note The amount of power that power management reserves for the chassis is a set value that does not vary depending on chassis components installed. The reserved power is the same for base and redundant configurations and for switches that do not have all base chassis components installed.
- To the power reserved for the chassis, add the power requirements
of the line cards.
For line card power requirements, refer to Power Requirements for EX8208 Switch Components. Do not include the PoE power budgets for PoE line cards in this step. Use only the base power requirements for all line cards.
For example, for a switch fully loaded with 8-port SFP+ line cards and using N+1 power redundancy, the total power requirement:
= reserved chassis watts + 8 (8–port SFP + line card watts)
= 1600 W + 8 (450) W
= 1600 W + 3600 W
= 5200 W
For a switch fully loaded with 8-port SFP+ line cards, using N+N power redundancy, and running Junos OS Release 10.2, the total power requirement:
= reserved chassis watts + 8 (8–port SFP + line card watts)
= 1200 W + 8 (450) W
= 1200 W + 3600 W
= 4800 W
- Calculate the number of power supplies (N) required to meet the total power requirement by dividing the total
power requirement by the output wattage of one power supply and then
rounding up.
Note If the input is high-voltage line (200–220 VAC), the output wattage of a 2000 W AC power supply is 2000 W.
If the input is low-voltage line (100–120 VAC), the output wattage of a 2000 W AC power supply is 1200 W.
For example, for a switch fully loaded with 8-port SFP+ line cards and using N+1 power redundancy with high-voltage line input , the required power supplies (N):
= (total power requirement) / (output wattage of power supply)
= (5200 W) / (2000 W)
= 2.6
= 3 (rounded up)
For a switch fully loaded with 8-port SFP+ line cards, using N+N power redundancy with high-voltage line input, and running Junos OS Release 10.2, the required power supplies (N):
= (total power requirement) / (output wattage of power supply)
= (4800 W) / (2000 W)
= 2.4
= 3 (rounded up)
- Add the number of power supplies needed to achieve the
required power redundancy:
To achieve N+1 power redundancy, add a single power supply.
For example, for a switch fully loaded with 8-port SFP+ line cards and using high-voltage line input, the total number of power supplies:
= N + 1
= 3 + 1
= 4
To achieve N+N power redundancy, add N power supplies.
For example, for a switch fully loaded with 8-port SFP+ line cards and using high-voltage line input, the total number of power supplies:
= N + N
= 3 + 3
= 6
- If the switch has PoE line cards:
- Add the configured PoE power budgets for PoE line cards to the total power requirement value that you calculated in step 2.
- Calculate the number of power supplies needed to meet the new total power requirement by dividing the total power requirement by the output wattage of one power supply and then rounding up.
- Compare this result to the N+1 or N+N value you calculated in step 4. Use the greater of the two values to determine how many power supplies you require.
We recommend that you maintain N +1 or N+N power supplies in your switch at all times. Replace failed power supplies immediately to prevent unexpected failures.
Power management raises a minor alarm if the number of online power supplies in your switch is less than the number required to maintain the configured power redundancy (N+1 in Junos OS Release 10.1 or earlier; N+1 or N+N in Junos OS Release 10.2 or later). If the problem is not corrected in 5 minutes, a major alarm is issued.
Power management raises a major alarm if the number of online power supplies in your switch is less than N power supplies. If your switch is running Junos OS Release 10.1 or earlier, all line cards are powered off. If your switch is running Junos OS Release 10.2 or later, power management provides power to line cards in priority order until power is exhausted. The remaining line cards are powered off.
If a new line card is installed in an operational switch, power management does not power on the line card if the increased power demand exceeds the total available power, including redundant power. If redundant power is used to power on the line card, a minor alarm is raised, which becomes a major alarm in 5 minutes if the condition is not corrected.
Power management does not take into account PoE budget allocations when raising alarms to indicate that N, N+1, or N+N requirements are not being met.