cperrymsu Did they fix this remotely or does that require a physical change of the tap?
Tap faceplate needs to be changed by a human being. In this case, a maintenance technician with an Xfinity bucket truck. The cable plant mostly runs aerial in my neighborhood. It does go underground across the street for a housing development. But for my tap change, the tech had to get out of the truck and go up in the bucket. Hard hat for safety!
In my case, Comcast pulled fiber deeper throughout the neighborhood, and replaced a coupler (fancy splitter) with a new node to split the amount of customers that are on a single node. However, there was a minibridger (amplifier) 250 ft down the line, but this wasn’t needed anymore since the new node is closer. So the amp was removed. But no one changed the value of the tap in the process. Tap value controls how much signal is reduced from the mainline. A higher tap value is desirable coming right out of an amplifier since the signal is super strong, and you don’t want to blast the homes with too much signal. Once the amplifier was removed, the tap value needed to be reduced as there was no more amplification right before my tap anymore.
crucialcolin It seems one OFDM now moves to 150 mhz and is only visible on DOCSIS 4.0 compatible devices(currently the XB10 or XD4).
From what I have seen the 150 MHz OFDM is just a standard 3.1 channel, any 3.1 modem can lock onto it. Running 3.1 Downstream OFDM in the FDX band, and no doubt the cable company is monitoring the correctables/uncorrectables and modulation rate during the pre-FDX enablement period. Once everything looks good, FDX is enabled and 3.1 modems lose the 2nd OFDM at 150 MHz. 3.0 channels are also moved from starting at 363/369 MHz to 387 MHz.
cypherstream Last time I spoke to a tech a few months ago, the D4 workaround for business was a XD4 D4.0 modem ethernet into a CBR2 router in a router mode similar to how they would connect EPON ONT to one. He said it was stupid to have two devices but its the only solution they have at this time.
If the Business Customer has cable phone service, then a 1.2 GHz 2 port splitter is added, and the XD4 is connected to one port (with Ethernet running to the CBR2), and a CBR1 with battery backup is connected to Port 2, so that in the event of a power outage, the customer can still dial out. Battery backup is required for the Business phone customers. For residential, it is optional. Same setup is/was used, but an XB7 is installed instead of the CBR1. Then on port 2, the XD4 modem can be connected. (or XB10 nowadays I would imagine)
XB10 does not support VoIP battery backup.
XB7/XB8 only, and by using the Xfinity Voice Battery Casing. (Only your VoIP line will stay up, Internet/Wi-Fi is not available when on battery backup).
The Xfinity Voice Battery Casing is powered by six 6-volt lantern batteries, which is enough to keep the gateway powered for up to 24 hours. Avoid power cycling the gateway when on battery power, as this will reduce battery life.
Of course, you can use any standard UPS or your own backup power options to keep the entire Gateway online. Enjoy Internet, Wi-Fi, and Cable Phone service. (well until the battery backup on the outside plant is discharged, and the modem loses sync as a result)
cperrymsu Could be. I thought I had read on here that pre FDX was OFDM at 150 MHz and 900 MHz and then just 900 MHz. Until a couple weeks ago the OFDM has been 957 MHz for me as well, then it went to 150/900 MHz and now it is only 900 MHz. When they moved the downstream QAMs to 387 MHz and above I lost the 150 MHz OFDM.
150 MHz OFDM switched from being a 3.1 OFDM channel to an FDX channel. QAMs need to cleared out up to 384 MHz for FDX operation as well. The Pre-FDX config uses QAM’s from 363 MHz and up, and once FDX is enabled, the first 3.0 QAM moves to 387 MHz. Both the Pre-FDX config and FDX config move QAM TV out of the FDX band, and to between 465-765 MHz. Cable boxes will automatically tune to the correct frequencies after the maintenance.
Sales enablement is what follows next. (when customers can actually sign up for FDX tiers or be upgraded automatically if your plan is not discontinued)
