VDSL SFP Bridge Modem

Turris Omnia
24

@andre
Hi,

So far I’ve SFP and a “Quick Installation Guide” explaining LEDs and stating “device gets hot while operating” which is true by the way. Nothing else apart from that; I guess I might get in touch with them to ask them to provide that Windows app mentioned there (and on Mikrotik forum).

As for other things worth mentioning

  1. Omnia is aware of SFP presence and switches wan to “phy-sfp-sgmii” mode via sfpswitch.py, you can set mode forcefully by editing /usr/sbin/sfpswitch.py (there is a variable at the beginning of the file), I guess this could be used as a workaround for some auto-negotiation related problems.
root@turris:~# cat /usr/sbin/sfpswitch.py
...
force_mode = None
# possible force_mode values are:
# None : autodetection
# 'phy-def' - metallic PHY
# 'phy-sfp' - 1000BASE-X
# 'phy-sfp-noneg' - 1000BASE-X, no up/down in-band signalling (force up)
# 'phy-sfp-sgmii' - SGMII

lockfile = '/var/run/sfpswitch.lock'
debug = False
daemon = False
...

  1. It’s quite common you can read some info about SFP using ethtool; this is not the case, it simply returns “Cannot get module EEPROM information: Not supported”

  2. It’s possible to use I2C, at least for getting basic info about this Versa :slight_smile: SFP (I’ve replaced my SN by *)

root@turris:~# i2cdump -y 5 0x50
No size specified (using byte-data access)
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 03 04 22 00 00 00 08 00 00 00 00 01 00 00 00 00    ??"...?....?....
10: 00 00 ff 00 50 52 4f 53 43 45 4e 44 20 20 20 20    ....PROSCEND
20: 20 20 20 20 00 00 00 00 31 38 30 2d 54 20 20 20        ....180-T
30: 20 20 20 20 20 20 20 20 56 33 2e 32 00 00 00 f2            V3.2...?
40: 08 00 00 00 30 30 30 30 30 30 ** ** ** ** ** **    ?...000000******
50: ** ** ** ** ** ** ** ** ** ** 00 00 00 00 00 4f    **********.....O
60: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
70: 20 20 20 20 20 20 20 20 56 65 72 2e 41 20 20 20            Ver.A
80: 80 81 82 83 84 85 86 87 88 89 8a 8b 8c 8d 8e 8f    ????????????????
90: 90 91 92 93 94 95 96 97 98 99 9a 9b 9c 9d 9e 9f    ????????????????
a0: a0 a1 a2 a3 a4 a5 a6 a7 a8 a9 aa ab ac ad ae af    ????????????????
b0: b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 ba bb bc bd be bf    ????????????????
c0: c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 ca cb cc cd ce cf    ????????????????
d0: d0 d1 d2 d3 d4 d5 d6 d7 d8 d9 da db dc dd de df    ????????????????
e0: e0 e1 e2 e3 e4 e5 e6 e7 e8 e9 ea eb ec ed ee ef    ????????????????
f0: f0 f1 f2 f3 f4 f5 f6 f7 f8 f9 fa fb fc fd fe ff    ???????????????.
  1. Apart from EtherBootManagement/EBM which I haven’t been be able to find much about so far (either I end up listening to FLA, Rotersand, VNV Nation or something else… or at pages related to various PXE tools), I bumped into pair of abbrevations related to SFP management and debugging: DDM and DOM (and some related tools), worth taking a note.

And that’s all for now.

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