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78 Appendix A Technical specifications
NN46110-318 02.01
System ports
The VPN Router 2750 system board provides the following built-in interfaces:
• two 10/100BASE-TX Ethernet local area network (LAN) ports
•serial port
This section provides information about the 10/100BASE-TX Ethernet LAN ports
and the serial port on the system board.
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 is used for 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 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.
Figure 27 on page 79 shows the 10/100BASE-X connector and the connector
pinouts.
Operating altitude 8202 ft (2500 m) maximum
Storage altitude 40 000 ft (12 192 m) maximum
Table 18 Physical, electrical, and environmental specifications (continued)
Specification Description