Table 2-1 on page 2-5 describes the UTP pin assignment.
Table
2-1. ATM Forum UTP Pin Assignment
Twisted
Pair
Pin
ATM Workstation
ATM
Switch/Concentrator
3
Pin 1
Transmit
+
Receive
+
3
Pin 2
Transmit
−
Receive
−
2
Pin 3
Unused
Unused
1
Pin 4
Unused
Unused
1
Pin 5
Unused
Unused
2
Pin 6
Unused
Unused
4
Pin 7
Receive
+
Transmit
+
4
Pin 8
Receive
−
Transmit
−
Note: The minimum UTP cable quality must meet EIA/TIA-568 Specification
for category 3 or equivalent UTP wiring. For additional information on how
cable wires are terminated, refer to “Cable Systems” in the
TURBOWAYS 25
ATM PCI Adapter Installation and Testing Instructions manual on the
CD-ROM.
STP Cables
If you are connecting a TURBOWAYS 25 Adapter in an STP cabling
system, you must use an IBM RJ-45 STP cable (P/N 42H0544) or
equivalent (see Figure 2-2). This IBM STP cable uses the ATM
Forum pin assignments and is identified by an
orange dot on the tag
of the cable. (Note that the TURBOWAYS 25 Adapter also has an
orange dot on its bracket.)
Orange Dot
Figure
2-2. IBM RJ-45 STP Adapter Cable (ATM Forum Pin Assignment)
Table 2-2 on page 2-6 describes the STP cable.
Chapter 2. Preparing to Install the Adapter
2-5
Summary of Contents for TURBOWAYS 25
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