Uplink And Subtending; Sfp Slots - ZyXEL Communications MSC1000G User Manual

MSC1000G User's Guide
The Ethernet ports are auto-negotiating and can detect and adjust to the optimum Ethernet
speed (100/1000 Mpbs) and duplex mode (full duplex or half duplex) of the connected device.
The Ethernet ports are also auto-crossover (auto-MDI/MDI-X), they automatically work with
a straight-through or crossover Ethernet cable.

2.3.2.1 Uplink and Subtending

SFP slots 1 and 2 are subtending ports. The Gigabit Ethernet port/SFP slot pairs labeled 3 and
4 are uplink ports.
The Gigabit Ethernet SFP slots and ports can function in either subtending or uplink mode.
Connect a port in uplink mode to an backbone Ethernet switch or router. The management
switch card allows traffic between the ports in uplink mode and the DSL ports on the line
cards.
Use the subtending mode to daisy-chain other Ethernet switches. With subtending mode, the
management switch card allows traffic between the ports in subtending mode and the ports in
uplink mode. The management switch card does not allow traffic between the ports in
subtending mode and the DSL ports on the line cards.
See Section 28.9.7 on page 476

2.3.3 SFP Slots

These are slots for SFP transceivers. A transceiver is a single unit that houses a transmitter and
a receiver. The switch does not come with transceivers. You must use transceivers that comply
with the SFP Transceiver MultiSource Agreement (MSA). See the SFF committee's INF-
8074i specification Rev 1.0 for details.
SFP slots 1 and 2 are separate interfaces.
SFP slots 3 and 4 are combined with Gigabit Ethernet ports 3 and 4 respectively. The SFP
ports have priority over the Gigabit ports. This means that if a SFP transceiver and the
corresponding Gigabit port are connected at the same time, the Gigabit port will be disabled.
You can change transceivers while the MSC is operating. You can use different transceivers to
connect to Ethernet switches with different types of fiber-optic connectors.
• Type: SFP connection interface
• Connection speed: 1 Gigabit per second (Gbps)
Note: To avoid possible eye injury, do not look into an operating fiber-optic module's
connectors.
54
to change the mode of a Gigabit Ethernet port.
Chapter 2 Hardware Connections