Differences between10G single rate and1/10G dual rate
Differences between10G single rate and1/10G dual rate
Various issues related to compatibility frequently occurs on 10G SFP+ transceivers. One of the reasons is that they have different variation in implementation of dual rates products.
|
|
10G single rate |
1/10G dual rate |
|
Transceiver codes |
0x10 0x00 0x00 0x00 0x40 0x00 0x0c 0x00 |
0x10 0x00 0x00 0x01 0x00 0x00 0x00 0x00 |
|
Transceiver types |
10G Ethernet: 10G Base-SR FC: short distance (S) FC: Multimode, 62.5um (M6) FC: Multimode, 50um (M5) |
10G Ethernet: 10G Base-SR Ethernet: 1000BASE-SX |
|
Rate identifier |
0x00 (unspecified) |
0x02 (8/4/2G Rx Rate Select only) |
|
Option values |
0x00 0x1a |
0x00 0x3a |
|
Option |
RX_LOS implemented TX_FAULT implemented TX_DISABLE implemented |
RX_LOS implemented TX_FAULT implemented TX_DISABLE implemented RATE_SELECT implemented |
|
BR margin, max |
10% |
0% |
|
BR margin, min |
88% |
0% |
A dual rates for 10G SFP+ transceiver of another vender, for example, shows below.
Transceiver codes : 0x10 0x00 0x00 0x01 0x40 0x40 0x0c 0x55
Transceiver type
: 10G Ethernet: 10G Base-SR
Transceiver type
: Ethernet: 1000BASE-SX
Transceiver type
: FC: short distance (S)
Transceiver type
: FC: Shortwave laser w/o OFC (SN)
Transceiver type
: FC: Multimode, 62.5um (M6)
Transceiver type
: FC: Multimode, 50um (M5)
Transceiver type
: FC: 800 MBytes/sec
Transceiver type
: FC: 400 MBytes/sec
Transceiver type
: FC: 200 MBytes/sec
Transceiver type
: FC: 100 MBytes/sec
Rate identifier : 0x00 (unspecified)
Option
:
RX_LOS implemented
Option
: TX_FAULT implemented
Option
: TX_DISABLE implemented
BR margin, max
: 0%
BR margin, min
: 0%
They are expected to be that Transceiver type would have both “10G Ethernet:10GBase-SR” and “Ethernet: 1000BASE-SX”, and that Option would have “RATE_SELECT implemented”. However, those vendors who experienced some failures when the products were equipped with some switches might decide to have such curious configuration showing above as an example to avoid the problems.
