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CHAPTER 2: INSTALLATION REQUIREMENTS/SPECIFICATIONS
2-4 SEH USER’S GUIDE
2.2 NETWORK PORT SPECIFICATIONS
The SEH-22 and SEH-24 network ports use shielded RJ45 connectors
that support both STP and UTP cabling. Figure 2-1 shows the RJ45
pinouts.
Figure 2-1. RJ45 Network Ports
2.3 TRANSCEIVER REQUIREMENTS
When connecting an external network segment via a transceiver to the
SEH with an EPIM-A, the following requirements must be met:
• The transceiver or Ethernet Device to which the module will be
connected must meet IEEE 802.3 standards, and/or Ethernet
Version 1.0 or Version 2.0 standards.
• The Signal Quality Error (SQE) test function on the transceiver
must be disabled when it is connected to a repeater or to an
Ethernet Version 1.0 device. In addition, some Version 2.0
equipment does not support the SQE test. Devices that do not
support the SQE test interpret the SQE test pulse as a collision.
1 2 3 4 5 6 7 8
1. Receive + 5. Not Used
2. Receive - 6. Transmit -
3. Transmit + 7. Not Used
4. Not Used 8. Not Used
5X
3X
1X
1490_3
SEH Book Page 4 Tuesday, March 19, 1996 4:12 PM