Small Form Factor Notes
Objective
本篇是記錄關於 SFF (Small Form Factor) 的相關規範，尤其是裡面的 EEPROM 資訊之驗證
SFF Spec list
SNIA, Storage Networking Industry Association 是一個提供全球包含儲存、網路工業標準的國際組織，成員大多由各大網通或儲存廠商所組成。此組織針對 SFF (Small Form Factor) 定義了目前常見的規範如下:
| Spec | Full name |
|---|---|
| SFF-8024 | SFF Committee Cross Reference to Industry Products |
| SFF-8436 | Quad Small Form-factor pluggable SFF-8436 (QSFP+) |
| SFF-8472 | Diagnostic Monitoring Interface for Optical Transceivers (SFP+) |
| SFF-8636 | Management Interface for Cabled Environments |
| SFF-8665 | QSFP+ 28 Gb/s 4X Pluggable Transceiver Solution (QSFP28) |
More information: SNIA Public Documents
SFF Standards Compliance
根據 SFF-8024 SFF Committee Cross Reference to Industry Products TABLE 3-1 PLUGGABLE CONNECTORS 文件指出，針對不同類型的 SFF 有各種適當的規範
以下是針對 DAC (Direct Attach Copper) 相關整理:
- 10Gb/s SFP+ DAC
- IEEE 802.3ae (10GbE)
- Electrical: SFF-8431, SFF-8083
- Mechanical: SFF-8432
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EEPROM: SFF-8472
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25Gb/s SFP28 DAC
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EEPROM: SFF-8402
-
40Gb/s QSFP+ DAC
- IEEE 802.3ba (40GbE or 100GbE)
- Electrical: IBTA V2 Revision 1.2.1 and 1.3
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EEPROM: SFF-8436
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100Gb/s QSFP28 DAC
- IEEE 802.3bj (100GbE)
- EEPROM: SFF-8665
Hands-on
Environment:
- Environment
- Cumulus Networks Cumulus Linux 3.2.1
- Edgecore ET6402-40GDAC-3M
- DAC (Direct Attach Copper)
- QSFP+
- 3M
EEPROM
- Output Using
ethtool -mroot@cumulus:~# ethtool -m swp49 |less Identifier : 0x0d (QSFP+) Extended identifier : 0x00 (1.5W max. Power consumption, No CDR in TX, No CDR in RX) Connector : 0x23 (No separable connector) Transceiver codes : 0x08 0x00 0x00 0x00 0x00 0x00 0x00 0x00 Transceiver type : 40G Ethernet: 40G Base-CR4 Encoding : 0x05 (64B/66B) BR, Nominal : 10300Mbps Rate identifier : 0x00 Length (SMF,km) : 0km Length (OM3 50um) : 0m Length (OM2 50um) : 0m Length (OM1 62.5um) : 0m Length (Copper or Active cable) : 3m Transmitter technology : 0xa0 (Copper cable unequalized) Attenuation at 2.5GHz : 3db Attenuation at 5.0GHz : 4db Vendor name : EDGE-CORE Vendor OUI : a8:b0:ae Vendor PN : ET6402-40GDAC-3M Vendor rev : 0 Vendor SN : *** Laser bias current (Channel 1) : 33.410 mA Laser bias current (Channel 2) : 26.222 mA Laser bias current (Channel 3) : 23.138 mA Laser bias current (Channel 4) : 26.212 mA Receiver signal OMA(Channel 1) : 1.7229 mW / 2.36 dBm Receiver signal OMA(Channel 2) : 2.0561 mW / 3.13 dBm Receiver signal OMA(Channel 3) : 1.6705 mW / 2.23 dBm Receiver signal OMA(Channel 4) : 2.0547 mW / 3.13 dBm Module temperature : 0.00 degrees C / 32.00 degrees F Module voltage : 0.0000 V Alarm/warning flags implemented : No
Details
因為這條線是 40G QSFP+，故 EEPROM 對照的規範應該要看 SFF-8436 的 7.6 QSFP+ Memory Map，而以上的資訊是遵照 7.6.2 Upper Memory Map Page 00h 的 Table 29 — Serial ID: Data Fields (Page 00) 裡的格式呈現
7.6.2.1 Identifier (Address 128)-
The identifier value specifies the physical device described by the serial information. The QSFP+ Module shall use the identifier 0Dh.
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7.6.2.2 Extended Identifier (Address 129) -
The extended identifier provides additional information about the basic Module types such as whether the Module contains a CDR function and identifies the power consumption class it belongs to.
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7.6.2.3 Connector (Address 130) -
The Connector value indicates the external connector provided on the interface. This value shall be included in the serial data. Note that 01h – 0Bh are not QSFP+ compatible, and are included for compatibility with other standards.
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7.6.2.4 Specification compliance (Address 131-138) - The following bit significant indicators define the electronic or optical interfaces that are supported by the QSFP+ Module. For Fibre Channel QSFP+s, the Fibre Channel speed, transmission media, transmitter technology, and distance capability shall all be indicated.
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0x08 0x00 0x00 0x00 0x00 0x00 0x00 0x00 == Address 131 (10/40G Ethernet Compliance Code), Bit 3 == 40G Base-CR4
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7.6.2.5 Encoding (Address 139) -
The encoding value indicates the serial encoding mechanism that is the nominal design target of the particular QSFP+ Module. The value shall be contained in the serial data.
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7.6.2.13 Device Tech (Address 147) -
The top 4 bits of the Device Tech byte describe the device technology used. The lower four bits (bits 7-4) of the Device Tech byte are used to describe the transmitter technology.
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7.6.2.{14, 16, 17, 18, 24} Vendor Name/OUI/PN/Rev/SN -
7.6.2.26 Diagnostic Monitoring Type (Address 220)Laser bias current (Channel 1) : 33.410 mA Laser bias current (Channel 2) : 26.222 mA Laser bias current (Channel 3) : 23.138 mA Laser bias current (Channel 4) : 26.212 mA Receiver signal OMA(Channel 1) : 1.7229 mW / 2.36 dBm Receiver signal OMA(Channel 2) : 2.0561 mW / 3.13 dBm Receiver signal OMA(Channel 3) : 1.6705 mW / 2.23 dBm Receiver signal OMA(Channel 4) : 2.0547 mW / 3.13 dBm Module temperature : 0.00 degrees C / 32.00 degrees F Module voltage : 0.0000 V Alarm/warning flags implemented : No - Digital Diagnostic Monitors monitor received power, bias current, supply voltage and temperature. Additionally, alarm and warning thresholds must be written as specified in this document.
References
- SFF-8472 Rev 12.2 Diagnostic Monitoring Interface for Optical Transceivers
- 光通讯：光纤、光模块及光接口常用知识
- SFF-8665 Rev 1.9 QSFP+ 28 Gb/s 4X Pluggable Transceiver Solution (QSFP28)
- SFF-8436 Rev 4.8 QSFP+ 10 Gbs 4X PLUGGABLE TRANSCEIVER
- SNIA, Storage Networking Industry Association
- SNIA Public Documents
- Cumulus Networks Official Website
- Wiki - American Wire Gauge, AWG
- SFF-8024 SFF Committee Cross Reference to Industry Products
- 100G & 25G Plugfests: What we learned - Cumulus Networks
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