Environmental Requirements

Your site must meet the environmental requirements and operating conditions covered in this chapter to ensure operation and maintainability of TSR system equipment.

Environmental Limits

The TSR system operates within the environmental limitations specified in Bellcore GR-63-CORE, except as noted.

Temperature Variation

Wide range temperature changes can degrade TSR system hardware modules and components. It is critical to move all TSR system equipment to a stable environment upon delivery to your site. For a list of temperature exposure limits for the TSR system hardware, refer to Table 2-1.

Table 2-1. Temperature Exposure Limits 

Equipment	Specification
Low temperature	-40°C (-38°F)
High temperature	70°C (158°F)
High relative humidity	90% to 95% R. H.
Low relative humidity	Not to fall below 5%

Operating Temperature and Humidity

The TSR system requires a climate-controlled environment. The following temperature and humidity limits apply to operating equipment after installation. Refer to Table 2-2.

Table 2-2. Temperature and Humidity Limits

Conditions	Limits
Operating Temperature:
long term	5 to 40°C (41 to 104°F)
short term	-5 to 50°C (23 to 122°F) for 96 hours
Rate of Temperature Change	9°C/hr (48.2°F/hr)
Operating Humidity:
long term	5% to 85% (non-condensing)
short term	0% to 90% (not to exceed 0.024kg water/kg of dry air)

Equipment Requirements

Ensure that your site adheres to the following compliance criteria and that the installation area accommodates the equipment specifications provided in Table 2-3.

Table 2-3. Compliance Criteria

Equipment	Specification
TSR Bay	FCC Part B Class A CSA/UL/CE safety certification NEBS Level III criteria
Weight	635 kg (1400 lb) (fully equipped)
Dimensions	height: 2178 mm (85.8 in.) width: 660 mm (26 in.) depth: 902 mm (35.5 in.)

Electrical Requirements

Ensure that your site adheres to the electrical specifications defined in Table 2-4.

Table 2-4. Electrical Specifications

Equipment	Specification
Power	Input range -40V to -60V at BIP (-48V nominal) Consumes a maximum of 5500 Watts (with modules, 2 cooling modules, and 2 bay controllers) Redundant -48V nominal power supply inputs, capable of operating indefinitely with one failed source power input.

Cooling Requirements

The following specifications must be met to provide adequate cooling capacity for the TSR system equipment.

• The thermal load per sq. feet of a TSR system is approximately 4.93 kW/sq. meter (458 W/sq. ft) assuming a 1219 mm (48 in.) front and 609 mm (24 in.) rear aisle.
  
  
• Estimated maximum thermal dissipation per bay should be approximately 5.5 KW; 40 modules dissipating approximately 125 W each.
  
  
• The TSR system consumes 400 BTU/hr per slot. This is equivalent to 16,000 BTU/hr for a Full Bay configuration and 8,000 BTU/hr for a Split bay configuration.
  
  
• Two (2) cooling modules are located in the bottom of the bay. The cooling modules draw air into the bay through filters on the front and rear surfaces at floor level, push it up through four shelves of electronic modules and the BIP, and exhaust it vertically through the top of the bay.
  
  
• There must be no cable channels or obstructions directly above the air flow output area of the bay. A gap of 6-12 inches is required. Refer to Figure 2-1.
  
  

Figure 2-1. Air Flow Through the TSR System

Power Requirements

The TSR system uses dual -48V power inputs that filter and distribute redundantly throughout the chassis. Redundancy prevents the failure of one power input from affecting another, and minimizes power outages.

Main power from customers battery packs and rectifier stacks (customer's power distribution system) supplies the TSR power at the BIP.

At the shelf level, there are a redundant pair of power supply inputs (one for each power feed bank), which interface -48V power to the backplane.

Primary power is distributed to TSR bays in one of two methods:

• Through direct feeds from the building DC power plant (if collocated with TSR system lineup)
  
  
• Through an intermediate power distribution center (if power plant is not collocated with TSR system lineup)
  
  

In either method above, all feeds (A and B) to a TSR system lineup must be sourced from a single (dedicated) power plant, preferably one source for both A and B feeds. The total power requirement for an existing TSR is 5300 watts.

Power Input

The following are the power input, cable sizing and upstream breaker requirements for the TSR bay:

• All power inputs have a maximum rating of 80 amps.
  
  
• Each of the power inputs require 50 amps minimum.
  
  
• Each of the redundant breaker panels require four 50 amp power inputs for a total of eight 50 amp inputs.
  
  
• Each input requires its own return, for a total of eight returns.
  
  
• All power input cabling should comply with local electrical codes for the location of the TSR being installed. The pertinent electrical codes should govern the sizing of upstream circuit protection, minimum cable ampacity, and voltage drop requirements.
  
  
• Voltage drop for each input cable should be less than 1Vdc.
  
  
• All input and return wires must be terminated with a UL listed two hole compression lug with hole size and spacing as shown in Figure 2-2.
  
  

Figure 2-2. Power and Return Compression Lug

Power and return feeds must enter the breaker input terminals from the top. The cables can be routed from overhead or from beneath raised flooring. If routed from beneath raised flooring, there are cable channels on both sides of the bay underneath the side panels. The side panels can be temporarily removed to access the cable channels for cable routing.

Power and return feeds must enter the BIP terminals from the top. The cables can be routed from the power source from overhead or from beneath a raised floor. There are cable routing channels on both side walls of the TSR system for cable routing from below a raised floor.

Grounding Requirements

Each frame should use an insulator pad between the frame and concrete floor or pedestal.

Each frame should be grounded using a minimum of #6 AWG cable either grounded directly to the ground window for the area or crimped to a cable used as a collector bar for that lineup of equipment.

The battery return bar must be directly referenced to the lab ground window, not through any other collector bar.

The A/C breaker panels feeding the lab should be located as close as possible to the ground window and the power plant to minimize the length of the cable.

Any coaxial cables coming from outside this ground area should pass through the ground window using a transmission ground reference bar.

Any other cables with ground conductors should also pass through the ground window.

Communication links must be dc-isolated and equipped with isolation devices.

Grounding the TSR Bay

Each TSR bay frame must be grounded with a minimum #6 AWG cable connected to a UL-listed two-hole compression type connector attached directly to the bay frame at the rear of the BIP. Figure 2-3 shows the TSR bay frame safety ground location, which go to the earth ground.

Figure 2-3. TSR Bay Main Power Ground Location

Copyright © 2001 Avici Systems Inc.
Avici® and TSR® are registered trademarks of Avici Systems Inc.
IPriori™ is a trademark of Avici Systems Inc.

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