Chapter 1 Introduction
ZyWALL USG 20-2000 User’s Guide
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1.8.1 Dual Personality Interfaces
A dual personality interface is a 1000Base-T/mini-GBIC combo port. For each interface you can
connect either to the 1000Base-T port or the mini-GBIC port. The mini-GBIC port has priority over
the 1000Base-T port so the 1000Base-T port is disabled if both are connected at the same time.
1000Base-T Ports
The 1000Base-T auto-negotiating, auto-crossover Ethernet ports support 100/1000 Mbps Gigabit
Ethernet so the speed can be 100 Mbps or 1000 Mbps. The duplex mode is full at 1000 Mbps and
half or full at 100 Mbps. An auto-negotiating port can detect and adjust to the optimum Ethernet
speed (100/1000 Mbps) and duplex mode (full duplex or half duplex) of the connected device. An
auto-crossover (auto-MDI/MDI-X) port automatically works with a straight-through or crossover
Ethernet cable. The factory default negotiation settings for the Ethernet ports on the ZyWALL are
speed: auto, duplex: auto, and flow control: on (you cannot configure the flow control setting, but
the ZyWALL can negotiate with the peer and turn it off if needed)
Mini-GBIC Slots
These are slots for Small Form-Factor Pluggable (SFP) transceivers (not included). A transceiver is a
single unit that houses a transmitter and a receiver. Use a transceiver to connect a fiber-optic cable
to the ZyWALL. Use transceivers that comply with the Small Form-Factor Pluggable (SFP)
Transceiver MultiSource Agreement (MSA). See the SFF committee’s INF-8074i specification Rev
USG 200
USG 100
USG 100
PLUS
USG 50
USG 20W
USG 20
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