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70 Appendix A Technical specifications
NN46110-316 03.01
System ports
This section provides information about the 10/100BASE-TX Ethernet LAN ports
and the serial port on the system board.
The VPN Router 1750 system board provides the following built-in interfaces:
• two 10/100BASE-TX Ethernet local area network (LAN) ports
• one serial port
10/100BASE-TX Ethernet LAN ports
The system board provides two 10/100BASE-TX Ethernet LAN interfaces—LAN
0 and LAN 1—on the rear of the chassis. (The LAN 0 interface provides Web
management.) Both built-in LAN interfaces accommodate an RJ-45 straight-
through cable. Depending on whether you use the interfaces for 10BASE-T or
100BASE-TX operation, select cables for the interfaces as follows:
• 100BASE-TX connections require category 5 twisted-pair wire. The
100BASE-TX specification supports 100 Mb/s transmission over two pairs of
category 5 twisted-pair Ethernet wiring: one pair each for transmit and receive
operations.
Nortel recommends that you use a maximum length of 100 meters for the
cable segment between a 100BASE-TX repeater and a workstation (due to
signal timing requirements). This wiring scheme complies with the EIA 568
wiring standard.
• 10BASE-T connections can use category 3, 4, or 5 twisted-pair wiring.
“10/100BASE-TX Ethernet connector” on page 71 shows the 10/100BASE-TX
connector and the connector pinouts.
Operating altitude 8202 ft (2500 m) maximum
Storage altitude 40 000 ft (12 192 m) maximum
Table 17 Physical, electrical, and environmental specifications (continued)
Specification Description