GE ML1200 Switch User Manual

2.1.6 SFP Gigabit (1000Mbps) port modules
The Gigabit port options for the modular slot come in a few different configurations of
Fiber SFP’s or RJ-45’s. The Multilink ML1200 offers only SFPs (Small Form Pluggable) for
Gigabit speed. There are multiple choices of SFP Gigabit transceiver types to combine with
RJ-45’s for the modular slot. Up to two Gigabit ports (max.) can be configured in the
modular slot C only. An example of a two Gb module is the HI Module (SFP fiber). An
example of a single Gigabit module is the HK Module (10/100/1000Mb RJ-45 ports). A
combo option of Gigabit copper and SFP fiber (HA Module) is shown below in the figure
The ML1200 Modules provide an SFP opening for insertion of industry-standard SFP
transceivers to provide Gigabit (Gb) media flexibility. Gigabit SFP modules are available in
both multi-mode (550m) and single-mode (10, 25, 40, 70) km fiber options as well as a
Gigabit copper option.
There are three LEDs mounted on each Gigabit port module. The Gigabit fiber has LEDs
that indicate F/H (Full/Half duplex), LK (Link status) and ACT (receiving activity) on that port
when lit. The copper Gigabit ports come with speeds indicating (10/100/1000Mb) LEDs
The operation of the Gigabit SFP and 10/100/1000 RJ-45 ports is as described for those
port types above.
2.1.7 Packet Prioritization, 802.1p QOS
Quality of Service means providing consistent predictable data delivery to users from
datagram paths that go all across a network. As a LAN device, the Multilink ML1200 can
do its part to prevent any QOS degradation while it is handling Ethernet traffic through its
ports and buffers.
The Multilink ML1200 switching hardware supports the IEEE 802.1p standard and fulfills its
role in support of QOS, giving packet processing priority to priority tagged packets
according to the 802.1p standard. In addition to hardware support for QOS, the MNS
software (R2) supports two priority queues that can be shared across the eight levels of
defined packet priorities for application-specific priority control by the user through
software configuration settings.