Installation Quality Bulletin
Installation Quality Bulletin Number: 03-03
To: All Installation Suppliers / Central Office Operations
Representatives / Design Engineering Representatives / Quality
Auditors / Technical Support Engineers / AMC Representatives
Date: Thursday, March 20, 2003
From: QWEST Installation Quality Assurance
Subject: Fiber Optic Cabling Support in the Central Office
Description of Bulletin:
The purpose of this document is to clarify Qwest’s policy on the proper fiber optic cable support
requirements for central office environments within the 14-state region. Qwest-approved Optical
Fiber Nonconductive Riser (OFNR) cables meet the requirements and objectives as documented
in Telcordia’s GR-409-CORE ensuring cable rack support qualifications.
Acknowledgements to Diana Unser for her contribution to this Bulletin. Inquiries can be
directed to her at (303) 707-7559.
Qwest Installation Quality Assurance
Fiber Optic Cable Support in Central Office Environments
When engineering or installing a cable support system for all Qwest-approved OFNR-rated fiber
optic cables, the following options are listed in the order of priority:
1ST CHOICE - All sizes of OFNR-rated Fiber Optic Cables
Run on Qwest-approved, orange, solid stringer ladder-type cable rack equipped with kydex
panning and brackets.
20" is the standard size for new 7' Floor-Supported systems unless specific office conditions,
Qwest capacity decisions, or Qwest Standard Configuration documents dictate different size
requirements. Fiber cable racks must be sized for ultimate, long-term capacities.
RESTRICTED - ADC FiberGuide (Yellow Duct)
Used to extend existing arrangements to their logical conclusion only, no new 7' floor-
Used only for the support and protection of older OFN-type jumpers or patch cords, not for
OFNR-type cables unless office conditions prevent the addition of fiber-only orange cable
Limited to singles / dual fiber cables. ADC FiberGuide does not maintain the minimum bend
radius for any larger fiber cable sizes.
2"x 2" solid duct for horizontal runs is restricted to customer premises, CEV, CEC, and hut
2"x 2" multi-slotted vertical duct is placed on each fiber equipment frame upright to protect
the fiber optic cables feeding to that frame / shelf. Using the approved 2"x 2" to serve more
than one frame is prohibited.
Split-flex tubing is approved to provide a transition from a 4"x 4" or 4"x 6"solid duct to a 2"x
2" multi-slotted vertical duct mounted on an equipment frame upright. Any other use is
4"x 4" and 4"x 6" sizes are conditionally approved for existing lineup applications. 4"x 12"
sizes are strictly limited to being locating above a FDF or NGF where a fiber-only cable rack
cannot be installed and existing space will allow.
Covers are required on all straight sections and fittings. Only Qwest-approved fittings shall
be used in Qwest central office environments.
RESTRICTED – Lucent Technologies (Orange Duct)
Extend existing lineup arrangements to logical conclusion only.
No new lineups / arrangements.
Convert to ADC FiberGuide (OFN fiber cables) or Qwest-approved orange fiber-only cable
rack (OFNR fiber cables) where possible.
Covers are required on all straight sections and fittings.
Additional Fiber Optic Cable Requirements
Orange corner brackets are required on every horizontal 90-degree corner required to support
the fiber cable. The OFNR fiber cables must be secured (Qwest Tech Pub 77350) to the
corner bracket to maintain bend radius.
Vertical OFNR fiber cables must be wrapped with fiber sheeting and tied to every vertical
cable rack cross-strap.
45-degree fixed clips or inside/outside orange 90-degree cable rack fabrications will be used
wherever possible for fiber cable rack changes in level or waterfalls in order to maintain the
minimum fiber optic cable bend radius.
Where possible, all quad and smaller fiber cables will be bundled together and loosely
secured every 5'-6' along the entire horizontal fiber cable route.
Fiber Optic Cable slack storage within dedicated, segregated fiber-only cable racks or fiber
duct type protection systems is strictly prohibited. Looping / coiling fiber cables within any
dedicated fiber support system is strictly prohibited.
NO stenciling or labeling of Qwest-approved orange ladder cable rack, yellow ADC
FiberGuide, nor Lucent orange duct is required.
Use of yellow or orange duct / cable rack for any other purpose than supporting or routing
fiber optic cables in a CO environment is strictly prohibited.
Adherence to fiber cable pileup limits within approved fiber cable support systems (Qwest
Tech Pub 77351) is mandatory.
OSP outdoor rated fiber cable must be spliced and converted to indoor-rated fiber cable at an
approved splice facility within 50-sheathed feet of entrance into the CO environment.
Placing fiber duct systems and OFN-rated fiber cables through a floor or wall cable
penetration is strictly prohibited.
Fiber cable is secured (Qwest Tech Pub 77350) on all vertical transitions. Pans & brackets
on cable rack waterfalls or changes in level are strictly prohibited.
Qwest Tech Pub 77351, Engineering Standards General Equipment Requirements, Module 1
Qwest Tech Pub 77350, Telecommunications Equipment Installation Guidelines
Qwest Standard Configuration Documents
Qwest Common Systems Home Page
Telcordia GR-409-CORE, Generic Requirements for Premises Fiber Optic Cable