Table 4-60. M-Type TOS screen options.
Parameter Description
TOS Monetary Cost
Priority
Mapping
Each Priority can select any of Queue 0 ~ Queue 3. In Default,
Priority 0 is mapping to Queue 0, Priority 1 is mapping to Queue 0,
Priority 2 is mapping to Queue 1, Priority 3 is mapping to Queue 1,
Priority 4 is mapping to Queue 2, Priority 5 is mapping to Queue 2,
Priority 6 is mapping to Queue 3, and Priority 0 is mapping to
Queue 3.
4.18.8 DSCP S
ETTING
In the late 1990s, the IETF redefined the meaning of the 8-bit SERVICE TYPE field to accommodate a set of
differentiated services (DS). Under the differentiated services interpretation, the first six bits comprise a code
point, which is sometimes abbreviated DSCP, and the last two bits are left unused.
DSCP can form total 64 (0~63) kinds of Traffic Class based on the arrangement of 6-bit field in DSCP of the IP
packet. In the switch, user is allowed to set up these 64 kinds of Class that belong to any of queue 0~3.
Table 4-61. DSCP Setting screen options.
Parameter Description
DSCP Priority Mapping
64 kinds of priority traffic as mentioned above, user can set up any
of Queue 0~3. In default, Priority 0~15 are mapping to Queue 0,
Priority 16~31 are mapping to Queue 1, Priority 32~47 are
mapping to Queue 0, Priority 48~63 are mapping to Queue 0.
4.19 Diagnostics
Three functions, including Diagnostics, Loopback Test and Ping Test are contained in this function folder for
device self-diagnostics. Each of them will be described in detail orderly in the following sections.
4.19.1 D
IAGNOSTICS
Diagnostics function provides a set of basic system diagnosis. It let users know that whether the system is health
or needs to be fixed. The basic system check includes EEPROM test, UART test, DRAM test and Flash test.
4.19.2 L
OOPBACK
T
EST
In the Loopback Test function, there are two different loopback tests. One is Internal Loopback Test and the
other is External Loopback Test. The former test function will not send the test signal outside the switch box.
The test signal only wraps around in the switch box. As to the latter test function, it will send the test signal to
its link partner. If you do not have them connected to active network devices, i.e. the ports are link down, the
switch will report the port numbers failed. If they all are ok, it just shows OK.
NOTE
Whatever you choose Internal Loopback Test or External Loopback Test, these two functions will
interfere with the normal system working, and all packets in sending and receiving also will stop
temporarily.
24-Port 10/100BASE-TX L2 Managed PoE Switch with 2 SFP Dual Media Ports
93
