Description

Starting with Junos 12.1X46-D55, firmware v2.16.0 is available for SRX-MP-1VDSL-A to support VDSL vectoring. Vectoring on VDSL reduces crosstalk and increases network bandwidth.

Symptoms

A new version of SRX was installed, but not seeing updated firmware version for VDSL card:

root> show version
Model: srx110h2-vb
JUNOS Software Release [12.3X48-D40.5]
JUNOS Firmware Software Suite [12.1X46-D65.4] <<< Newer version that should have the v2.16.0 

root> show system firmware
Part             Type           Tag Current   Available Status
                                    version   version
FPC 1          
  PIC 0          VDSLBCM        10  2.15.0              OK   <-- Wrong firmware version
Routing Engine 0 RE BIOS        0   2.8       2.8       OK               
Routing Engine 0 RE BIOS Backup 1   2.5       2.8       OK               
Routing Engine 0 RE FPGA        14  1.0.0               OK                 


Firmware v2.16.0 is needed in order to support G.993.5 VDSL Vectoring.

Solution

Even when running ​Junos versions with the firmware v2.16.0 installed, the SRX is not activating it because the ISDN VDSL (Annex B) card doesn’t support VDSL vectoring.

root> show chassis hardware
-------------------------------------------------------------------------
Hardware inventory:
Item             Version  Part number  Serial number     Description
Chassis                                                                SRX110H2-VB
.....
FPC 1                                                                  FPC
  PIC 0                                                                Internal VDSL2/ADSL-ISDN <-- Not supported hardware for this feature.

Only POTS module has this feature support (VDSL2 Annex A). For ISDN (Annex-B), this was not implemented.

If VDSL vectoring is really needed to establish the connection with the service provider, then the SRX must be running Annex-A card.  

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