To the Volpe audience: If one leg leaving a node has an impairment, that impairment on that particular leg should not affect or impact the other legs, correct? If the legs are isolated, what could cause my PNM tool to display moderate or severely impaired modems in the entire node with completely random echo cavity footages but all having the exact same ICFR signature? Light levels coming into the node are in spec and have not deviated, DS and US signal at node test ports all look good. Any ideas?
From my OSP experiences random ICFR and Echo means there is damaged cable on that leg somewhere in the plant. Said damage is more than likely causing ingress noise that will for sure screw up the upstream carriers. Resulting in slow/bad/high latency internet service, tiling on HD, VOD issues, etc. Might need a Quiver and/or Viavi meters to track out and fix the noise. What does the noise signature look like in path track or expert track?
@MrFrancggetsbux Thanks for the reply! I utilize my Quiver often for CPD and my Viavi 630 & 1G daily for RF impairments, however, this one has me puzzled. All modems on every leg of the node has the same ICFR peak to valley signature when looking at the flatness of the channel via our PNM tool. I understand that all legs of a node may have impairments that need to be addressed but this seems to be the same impairment affecting ALL legs of this node. Why would all legs show that same signature? Also, all modems in that node went from good to impaired at the same time. I'm guessing it may be something defective within the node itself? I'm relatively new to maintenance...still figuring all of this out. Thanks again for the input, Mr.Franc.
Hi @usernameredacted4731 thanks for watching and the question. @MrFrancggetsbux had some good input already. On the downstream, isolation typically will be your friend, but on the upstream you will typically be combining signals unless the node is fully segmented. So basically, there are a lot of "it depends" here.
Hi guys, thanks for the great video. Could I please ask you, in practice is the resistivity of the conductor a frequency dependent or frequency independent parameter? Thanks!
Hi Brady, I appreciate your content a lot. I’m a technician at an ISP called charter communications and your content has boosted my skills. How about making an episode on how to advance your career and earn more money in telecommunications? Working in the field is hard on the body and I know I can’t do it forever. I wonder how someone like me can become an expert or make more money. Maybe you can invite some guests who can share their insights on how to succeed in the cable industry.
There is always room to grow in the cable industry. This is a great topic and we will try to work on it. I have someone in mind, not sure their corp. will let them speak but I know many people in cable that started at the floor and worked their way up. Thank you for the feedback.
To the Volpe audience: If one leg leaving a node has an impairment, that impairment on that particular leg should not affect or impact the other legs, correct? If the legs are isolated, what could cause my PNM tool to display moderate or severely impaired modems in the entire node with completely random echo cavity footages but all having the exact same ICFR signature? Light levels coming into the node are in spec and have not deviated, DS and US signal at node test ports all look good. Any ideas?
From my OSP experiences random ICFR and Echo means there is damaged cable on that leg somewhere in the plant. Said damage is more than likely causing ingress noise that will for sure screw up the upstream carriers. Resulting in slow/bad/high latency internet service, tiling on HD, VOD issues, etc. Might need a Quiver and/or Viavi meters to track out and fix the noise. What does the noise signature look like in path track or expert track?
@MrFrancggetsbux Thanks for the reply! I utilize my Quiver often for CPD and my Viavi 630 & 1G daily for RF impairments, however, this one has me puzzled. All modems on every leg of the node has the same ICFR peak to valley signature when looking at the flatness of the channel via our PNM tool.
I understand that all legs of a node may have impairments that need to be addressed but this seems to be the same impairment affecting ALL legs of this node. Why would all legs show that same signature? Also, all modems in that node went from good to impaired at the same time. I'm guessing it may be something defective within the node itself? I'm relatively new to maintenance...still figuring all of this out. Thanks again for the input, Mr.Franc.
Hi @usernameredacted4731 thanks for watching and the question. @MrFrancggetsbux had some good input already. On the downstream, isolation typically will be your friend, but on the upstream you will typically be combining signals unless the node is fully segmented. So basically, there are a lot of "it depends" here.
Hi guys, thanks for the great video. Could I please ask you, in practice is the resistivity of the conductor a frequency dependent or frequency independent parameter? Thanks!
How can the attenuation of a coax line operating at DC and low frequencies (up to 1 MHz) be calculated?
I guess you could apply the fourier transform on whatever wave and get weighted sinewaves of various frequencies .
Hi Brady, I appreciate your content a lot. I’m a technician at an ISP called charter communications and your content has boosted my skills. How about making an episode on how to advance your career and earn more money in telecommunications? Working in the field is hard on the body and I know I can’t do it forever. I wonder how someone like me can become an expert or make more money. Maybe you can invite some guests who can share their insights on how to succeed in the cable industry.
There is always room to grow in the cable industry. This is a great topic and we will try to work on it. I have someone in mind, not sure their corp. will let them speak but I know many people in cable that started at the floor and worked their way up. Thank you for the feedback.
Hard on the body is right. I'm getting burned out as it is. I definitely don't want to be doing this when I get into my 50's.
Bring on the math
We love math 😀
Promo-SM 🤔