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The SSR system requires routine maintenance on the following SSR system components:
- Fiber optics
- Ground connections
- Power
- Air filters
Fiber Cleaning
Unclean fibers are one of the most common causes of system failures. In order to minimize the risk of system failures due to dirty fibers, ensure that you have access to a fiber cleaning kit at the site.
Before installing a module, clean each connector on the modules using dry and or wet cleaning techniques according to manufacturers cleaning guidelines.
Before installing new fiber, inspect the fiber patch cords connecting the SSR system to centralized fiber management systems in the Telcos using an OFS 300 Optical Fiber Scope. Additionally, patch cords in use should be inspected monthly for dirt and damage.
Upon removing any shelf module, the appropriate connectors should be cleaned before the module is inserted back into the shelf.
Power Connections
Power lugs going into the BIP should be checked and tightened as required.
Ground Connections
Ground connections to SSR system should be checked monthly to ensure that the total leakage current does not exceed 0.1 amps. Leakage above this value is not acceptable and should be investigated.
Cleaning and Replacing the Air Filters
The SSR bay has three removable air filters seated horizontally in the tray mounted inside the front air intake assembly and inside the lower left and right side of the chassis. The filters screen out environmental dust drawn into the system by the cooling modules.
The SSR system uses either UL listed 94H-1, UL 900 Class Universal polyester air filters, or Electromaze with ABS frame AUD and 94 H-1 UL Class II Electromaze media.
Figure B-1 shows the air filter.
Figure B-1. Universal Polyester Air Filter
Filters require removal and cleaning or replacement approximately once every four weeks, more often in highly dusty areas. A damaged or worn filter prevents proper flow of cooling air, which might result in an over temperature condition.
Adhere to all caution and warning statements while performing filter maintenance procedures.
PROCEDURE: Use the following steps to replace system air filters:
Step 1 Remove the rear air intake grille to access the front and side filters.
Step 2 To remove the front filter, slip it out of the grill by flipping the two retaining clips on the upper left and right side of the back of the front air intake grill. This will release the filter from its slot.
Step 3 Pull filter up and out.
Figure B-2. Front Air Intake Filter Removal
CAUTION (C:B-1) Do not place tools on the filter tray. Damage to the honey comb screen of the filter can restrict air flow.
Step 4 Visually inspect the condition of the air filter. If the filter is extremely dusty, or appears damaged, replace it with a new air filter.
Step 5 If the filter is in good condition and not too dusty, move it away from the system and vacuum it thoroughly.
NOTE To prevent high levels of dust particles from re-entering the system, do not vacuum the filter near the system.
To prevent damage to the filter fibers and metal filter screen, use caution when vacuuming.Step 6 With your thumb and forefinger grasp the edge of the clean air filter and slide the clean air filter into the front air intake grille, with the gasket side of the filter toward the inside of the machine. Tuck the filter into the slot at the bottom of the grill and take care to open the retaining latches before sliding the top of the filter into place, see Figure B-3.
Figure B-3. Replacing Air Filter
Step 7 To remove the left or right side filters, open the retaining clips and slip out the filter. Repeat Step 4 and Step 5.
Step 8 With your thumb and forefinger grasp the edge of the clean air filter and slide the clean air filter into the left or right side, taken care to lift the retaining clips. Release the retaining clips to lock into place.
Step 9 Repeat for the other air filter on the other side.
Step 10 Press on the face of the grille assembly onto the two ball studs to secure it to the frame.
Cooling Modules
It is critical to address cooling module failures immediately as lack of proper cooling will effect the performance of the SSR system.
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Copyright © 2005
Avici Systems Inc.
Avici® and TSR®
is a registered trademark of Avici Systems Inc.
IPriori™, Composite Links™, SSR™, QSR, and NSR® are
trademarks of Avici Systems Inc.
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Last Updated: 04/04/05 at 16:10:42