Technical data

Using the Model 5625HD EtherSpeed Switch Module
B-6
206208-A
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 (MIC) 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-4
). 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-4. Fast Ethernet Type 1 Balun Media Adapter
Note:
A 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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