Chassis Installation


Chassis Installation
 
This chapter provides information on rack configurations and instructions for installing and removing the chassis and its sub-components: the upper and lower fan trays and the Power Filter Units (PFUs).
Important: Prior to installation, personnel should review and be familiar with all recommendations for Central Office installations, as found in Telcordia GR-1275-CORE Central Office Environment Installation/Removal Generic Requirements, Issue 3, December 2001.
Warning: The PFUs each have two power supply cables (-48VDC and RTN). To reduce the risk of electric shock, exercise caution when working within the chassis if one PFU is still cabled. To fully de-energize the PFU, disconnect both power supply cables from each PFU. Beide Netzteile (Power Filter Units, PFU) haben 2 Stromversorgungsanschluesse (-48 VDC und RTN). Vorsicht is geboten bei Arbeiten am Chassis, solange noch ein Netzteil verkabelt ist. Um die PFU komplett stromlos zu schalten muessen beide Kabel entfernt werden.
Equipment Rack Configuration
The chassis is designed for installation in a standard 19-inch (48.26 cm) equipment rack. Additional rack hardware, such as extension brackets, may be used to install the chassis in a standard 23-inch (58.42 cm) rack. Each chassis is 24.50 inches (62.23 cm) high. This equates to roughly 14 Rack Mount Units (RMUs: 1 RMU = 1.75 in (4.45 cm).
You can mount a maximum of three chassis in a standard 48 RMU (7 feet) equipment rack or telco cabinet provided that all system cooling and ventilation requirements are met. A fully-loaded rack with three chassis installed has approximately 5.5 inches (13.97 cm, 3.14 RMUs) of vertical space remaining.
Caution: When planning chassis installation, take care to ensure that equipment rack or cabinet hardware does not hinder air flow at any of the intake or exhaust vents. Additionally, ensure that the rack/cabinet hardware, as well as the ambient environment, allow the system to function within the required limits. Refer to the Ventilation Considerations section of this chapter for more information.
Ventilation Considerations
Airflow within the system is designed per Telcordia recommendations to ensure the proper vertical convection cooling of the system.
As shown in the following figure, the lower fan tray pulls fresh air in from the front and side intake vents located near the bottom of the chassis. The air is forced upwards through the system and cools installed components as it passes over them. The airflow through the chassis, as measured by the speed of the airflow across the various card slots, maintains an average of 290 feet per minute (fpm).
The upper fan tray pulls heated air up through the chassis. The air is forced through the side and rear exhaust vents located near the top of the chassis before it is expelled from the system.
 
System Airflow & Ventilation
Proper ventilation and cooling must allow the chassis to operate within the temperature and humidity levels described in the following table.
Operating Temperature and Humidity Recommendations
Mounting Options
There are two options for mounting the chassis in a standard equipment rack or telecommunications cabinet:
 
Standard: In this configuration, the flanges of the mounting brackets are flush with the front of the chassis. This is the default configuration as shipped. Refer to the Standard Installation of the Chassis section of this chapter.
Mid-mount: In this configuration, the flanges of the mounting brackets are recessed from the front of the chassis. To do this, install the mounting brackets toward the middle of the chassis on either side. Refer to the Mid-Mount Installation of the Chassis section of this chapter.
Weight Considerations
The shipping weight of the chassis is approximately 160 pounds (72.57 kg). Please consider the following recommendations before proceeding:
 
 
If no lift is available, reduce the weight according to the instructions in the Reducing the Weight of the Chassis Prior to Installation section that follows. This reduces the weight of the chassis to approximately 125 lbs. (56.7 kg).
Installing the Chassis
Important: If you are installing more than one chassis in an equipment rack, to ensure an easier installation, begin by installing the first chassis near the bottom of the rack.
Caution: When handling or moving the chassis, lift the chassis from the bottom only. Lifting it by any other part could result in damage to the chassis.
 
Reducing the Weight of the Chassis Prior to Installation
To make the installation process easier, you can reduce the weight of the chassis prior to installation by removing the upper and lower fan trays and the PFUs. Follow the instructions below to safely remove these components prior to installation.
ESD Caution: During installation, maintenance, and/or removal, wear grounding wrist and/or heel straps to avoid ESD damage to the components. Failure to do so could result in damage to electrical components and could potentially void your warranty.
Step 1
Step a
Step b
Step c
Warning: To avoid personal injury and/or damage to the fan tray, be sure to support the fan tray’s weight from its front and back as you slide it completely out of the chassis. Vorsicht beim Herausziehen der Luefter-Schublade: um eine Beschaedigung des Moduls und eventuelle Verletzungen zu vermeiden, sollte diese hinten und vorne unterstuetzt werden.
Step 2
 
Step a
Step b
Step c
Warning: To avoid personal injury and/or damage to the fan tray, be sure to support the fan tray’s weight from its front and back as you slide it completely out of the chassis. Vorsicht beim Herausziehen der Luefter-Schublade: um eine Beschaedigung des Moduls und eventuelle Verletzungen zu vermeiden, sollte diese hinten und vorne unterstuetzt werden.
Step 3
 
Step a
Step b
Step c
Step d
Repeat step b and step c for the PFU located in the bay labeled Power Filter Unit 2 located on the lower-right side of the chassis.
Step 4
Proceed to either the Standard Installation of the Chassis or Mid-Mount Installation of the Chassis section that follows, based on the mounting option you are using.
 
Standard Installation of the Chassis
Follow the instructions below to perform the standard installation of the chassis.
ESD Caution: During installation, maintenance, and/or removal, wear grounding wrist and/or heel straps to avoid ESD damage to the components. Failure to do so could result in damage to electrical components and could potentially void your warranty.
Step 1
Step 2
Step 3
Repeat step 1 and step 2 for any additional chassis you are installing in the equipment rack.
Step 4
If you took steps to reduce the weight of the chassis prior to installation, refer to the instructions in the Re-Installing Chassis Sub-components section to re-install the components. Otherwise, proceed to Application Card Installation.
 
Mid-Mount Installation of the Chassis
Follow the instructions below to perform the mid-mount installation of the system.
ESD Caution: During installation, maintenance, and/or removal, wear grounding wrist straps to avoid ESD damage to the components. Failure to do so could result in damage to electrical components and could potentially void your warranty.
Step 1
Step 2
 
Step 3
Repeat step 1 and step 2 for the bracket on the opposite side of the chassis.
Step 4
Step 5
Step 6
Proceed to the Grounding the Chassis section that follows to ground the chassis.
 
Grounding the Chassis
Make sure that the chassis is properly grounded prior to installing any chassis sub-components or cards. The chassis and the equipment rack or telecommunications cabinet that it is installed in must be connected to the same ground.
Caution: Failure to properly ground the chassis could result in personal injury and/or damage to the chassis and its components.
There are two sets of grounding terminals located at the lower-rear of the chassis. The following figure and the table that follows show the location of these terminals and provide specifications for the appropriate lug and cable size.
Terminal and Cable specifications
Follow the instructions below to connect the chassis to earth ground.
Step 1
Step 2
Step 3
Step 4
Secure the lug to the ground terminals with the nuts and washers you removed in step 2. The nuts should be torqued to 50 in-lb (5.65 n-m).
Step 5
Repeat step 2 through step 4 to connect the ground cable to the grounding posts on the lower-right corner at the rear of the chassis next to the bay labeled Power Filter Unit 2.
Step 6
If you took steps to reduce the weight of the chassis prior to installation, refer to the instructions in the Re-Installing Chassis Sub-components section to re-install the components. Otherwise, proceed to Application Card Installation.
 
Re-Installing Chassis Sub-components
If you performed the procedure in the Reducing the Weight of the Chassis Prior to Installation section, perform the instructions below to re-install the sub-components of the chassis that were removed.
ESD Caution: During installation, maintenance, and/or removal, wear grounding wrist straps to avoid ESD damage to the components. Failure to do so could result in damage to electrical components and could potentially void your warranty.
Step 1
 
Step a
Step b
Step c
Step d
Step 2
 
Step a
Step b
Step c
 
Step d
Important: The fan tray bay cover is keyed and can only be installed in one direction.
Step e
Step 3
Step a
Step b
Step c
Step d
Step 4
 
 

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