ZyXEL Communications NSW Series User Manual page 39

Table 9 Basic Setting > Port Setup (continued)
LABEL DESCRIPTION
Type This field displays the capacity that the port can support.
Speed/Duplex Select the speed and the duplex mode of the Ethernet connection on this port. Choices are
Auto-1000M, 10M/Half Duplex, 10M/Full Duplex, 100M/Half Duplex, 100M/Full Duplex and 1000M/
Full Duplex (Gigabit connections only). 10G port choices are Auto-1000M, 1000M/Full Duplex and
10G/Full Duplex.
Selecting Auto-1000M (auto-negotiation) allows one port to negotiate with a peer port
automatically to obtain the connection speed (of up to 1000M) and duplex mode that both ends
support. When auto-negotiation is turned on, a port on the NSW negotiates with the peer
automatically to determine the connection speed and duplex mode. If the peer port does not
support auto-negotiation or turns off this feature, the NSW determines the connection speed by
detecting the signal on the cable and using half duplex mode. When the NSW's auto-negotiation
is turned off, a port uses the pre-configured speed and duplex mode when making a connection,
thus requiring you to make sure that the settings of the peer port are the same in order to
connect.
802.1p Priority This priority value is added to incoming frames without a (802.1p) priority queue tag.
The following descriptions are based on the traffic types defined in the IEEE 802.1d standard
(which incorporates the 802.1p).
• Level 7: Typically used for network control traffic such as router configuration messages.
• Level 6: Typically used for voice traffic that is especially sensitive to jitter (jitter is the variations
in delay).
• Level 5: Typically used for video that consumes high bandwidth and is sensitive to jitter.
• Level 4: Typically used for controlled load, latency-sensitive traffic such as SNA (Systems
Network Architecture) transactions.
• Level 3: Typically used for "excellent effort" or better than best effort and would include
important business traffic that can tolerate some delay.
• Level 2: This is for "spare bandwidth".
• Level 1: This is typically used for non-critical "background" traffic such as bulk transfers that
are allowed but that should not affect other applications and users.
• Level 0: Typically used for best-effort traffic.
Media Type You can insert either an SFP+ transceiver or an SFP+ Direct Attach Copper (DAC) cable into the
10 Gigabit interface of the NSW. An SFP+ Direct Attach Copper (DAC) is an SFP+ housing that has
(NSW200-28P
no optical module but uses a fixed-length passive copper cable assembly, which reduces cost
only)
and power significantly.
Select the media type (sfp_plus or dac10g) of the SFP+ module that is attached to the 10 Gigabit
interface.
Apply Click Apply to save your changes to the NSW's run-time memory. The NSW loses these changes if
it is turned off or loses power, so use the Save link on the top navigation panel to save your
changes to the non-volatile memory when you are done configuring.
Cancel Click Cancel to begin configuring this screen afresh.
Chapter 6 Basic Setting
NSW Series User's Guide
39