參數(shù)資料
型號： IP175CH
廠商： Electronic Theatre Controls, Inc.
英文描述： 5 Port 10/100 Ethernet Integrated Switch
中文描述： 5端口10/100以太網(wǎng)集成開關(guān)
文件頁數(shù)： 46/111頁
文件大?。?/td> 679K
代理商： IP175CH
IP175C/IP175C LF/IP175CH/IP175CH LF
Data Sheet
2.9
CoS
IP175C/IP175CH supports two type of CoS. One is port base priority and the other is frame base priority.
IP175C/IP175CH supports two levels of priority queues.
2.9.1
Port base priority
The packets received from high priority port will be handled as high priority frames if the port base priority
is enabled. It is enabled by programming the “high priority port enable” bit in MII register 29.19~29.21or
EEPROM register 14~18. Each port of IP175C/IP175CH can be configured as a high priority port
individually.
2.9.2
Frame base priority
2.9.2.1
VLAN tag and TCP/IP TOS
IP175C/IP175CH examines the specific bits in VLAN tag and TCP/IP TOS for priority frames if the frame
base priority is enabled. A high priority packet will be queued into the high priority queue; this action will
ensure more bandwidth is allocated for the high priority packets in the transmission. The packets will be
handled as high priority frames if the tag value meets the high priority requirement, that is, priority bits in
a VLAN tag bigger than 3 or TCP/IP TOS field not equal to 3’b000. It is enabled by programming the
“class of service enable” bit in MII register 29.19~29.21 or EEPROM register 14~18. The frame base
priority function of each port can be enabled individually.
The ratio of bandwidth of high priority and low priority queue is defined in MII register 30.12[4] or
EEPROM 60[4].
byte
TYPE = 8100
VLAN field
TCI (tag control information)
12~13
14~15
TCI definition:
Bit[15:13]: User Priority 7~0
Bit 12: Canonical Format Indicator (CFI)
Bit[11~0]: VLAN ID.
IP175C uses bit[15:13] to define priority.
byte
TYPE = 0800
TOS field
IP HEADER
12~13
14~15
IP header definition:
Byte 14
Bit[7:0]: IP protocol version number & header length.
Byte 15: Service type
Bit[7~5]: IP Priority (Precedence ) from 7~0
Bit 4: No Delay (D)
Bit 3: High Throughput
Bit 2: High Reliability (R)
Bit[1:0]: Reserved
IP175C uses bit[4:2] to define priority.
Copyright
2004, IC Plus Corp.
Mar 09, 2007
46/111
IP175C/IP175CH-DS-R14
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