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207344-B B-7
Using Shielded Twisted Pair Cables
Type 1 shielded twisted pair (STP) cabling also operates with 10BASE-T Ethernet
and 100BASE-TX Fast Ethernet. Type 1 STP cable consists of tinned-copper
braided shield surrounding two data-grade twisted pairs of #22 AWG solid copper
conductors that have individual or S-shaped shields of aluminum-backed
insulating tape or metallized Mylar foil.
Type 1 cable generally is used between wiring closets or from the wiring closet
patch panel to the work area wall outlet.
Type 1 cable generally is terminated with an IBM four-position data connector.
Nortel Networks Fast Ethernet supports 100BASE-TX Fast Ethernet over STP
media through the application of a specialized balun media adapter, also referred
to as a Type 1 balun (Figure B-5
). When adapting 150-ohm STP cable plants for
Fast Ethernet applications, balun media adapters are required at both the hub and
station ends of the STP cable plant. Media adapters (such as AMP part number
558421-1) are available that plug into the RJ-45 patch cable connectors, allowing
the patch cable to connect with an IBM data connector. The media adapter and
patch cable provide impedance matching between UTP (100-ohm) and STP
(150-ohm) cabling.
Figure B-5. Fast Ethernet Type 1 Balun Media Adapter
Note: A balanced unbalanced (balun) media adapter is required when
connecting 100-ohm RJ-45 100BASE-TX ports to a 150-ohm STP cable plant.
This adapter provides impedance matching between UTP (100-ohm) and STP
(150-ohm) cabling.
Note: For additional information about AMP Type 1 balun media adapters
(part number 558421-1), contact your AMP reseller or distributor. The user
should verify that the combination of the STP cable plant and the impedance-
matching baluns meets the requirements of the applicable LAN standard.
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