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Corrosion Performance of CommScope Drop Cables
Technical Report |
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Introduction
Drop cables
are deployed in a wide variety of climates,
but just three installation environments - aerial,
underground
and indoor. While each environment offers
unique challenges and conditions, they all share a
common concern . corrosion. Fortunately, modern
subscriber access cables offer a variety of treatment
methods to combat corrosion, each with its own unique
features. The performance and features of these treatments
will assist the installer in determining which treatment is
appropriate for their environment.
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Standards for
Corrosion Resistance
Any discussion of corrosion resistance must begin with
review of applicable performance standards. The SCTE
Engineering Committee IPS (Interface Practices Subcommittee)
has written and adopted the .Test Method for
Moisture Inhibitor Corrosion Resistance., IPS-TP-017.
This test method requires that a cable sample with slots
cut in the jacket be exposed to a salt fog environment for
144 hours. Once complete, the shielding surrounding
the slot must not show any visible signs of corrosion.
All CommScope corrosion resistant treatments meet and
exceed the requirements as defined in this standard. |
Available
Treatments
CommScope Drop Cables are available with the
following corrosion resisting treatments. Treatments are
available for all shielding configurations (as shown
below in Table 1).
The common applications listed are recommended and
typical for the industry, although any treatment may be
substituted as a matter of customer preference, and all
treatments have proven reliable in all conditions.
BrightWire? is a dry chemical treatment that is applied
to the metals prior to cable assembly. BrightWire resists
oxidation in the presence of water, and is the cleanest
and least obtrusive treatment available today.
BrightWire is best utilized in aerial and indoor applications
where corrosion resistance is desired without the
mess flooding compounds can create during cable
preparation. |
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Migra-Heal? is a viscous flooding compound which coats
the aluminum shield elements where applied. Migra-Heal
forms a moisture barrier, preventing water from contacting
and corroding shield elements. Migra-Heal is only
available with a PE jacket material. Migra-Heal.s viscous
nature provides superior moisture and corrosion resistance,
and is often preferred in underground plant where
standing water is common.
APDTM is a waxy filling compound which coats the
aluminum shield elements where applied. APD, like
Migra-Heal, forms a moisture barrier, preventing water
from contacting and corroding shield elements. APD is
easily cleaned off, is available with all jacket materials,
and is often preferred in aerial plant. APD is often chosen
as an excellent general purpose flooding compound.
ETPR is a traditional flooding compound from the
telephony industry. It is chosen where twisted pair hybrid
cables are utilized, primarily because it wipes clean easily.
ETPR, like all CommScope flooding compounds, meets
and exceeds the requirements of IPS-TP-017. |
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