sundance-communications.com/forum Forums General General Telephone & Systems Information Returning after absence -- with a problem/question

I could try and explain the physics, but this is not that kind of forum. If you think that "fuses" are designed to operate (open) when a current carrying circuit exceeds the current rating of the fuse and "surge" suppressors are designed to shunt a voltage that exceeds the designed operating voltage to ground, you may get the complicated reasoning behind short circuit protection and lightning or surge protection.

ANY manufacturer that dares to put "lightning protection" as an attribute to their "protectors" is asking for a world of damage claims. As I must reiterate, there is NOTHING in this world that can contain a direct lightning strike. A fuse just can't operate fast enough, but diode like protection devices can. The Porta Systems uses TVSS (Transient Voltage Surge Suppressor) solid state devices to protect the circuit. When they "operate" they are done, forever. Click Here.

For a detailed synopsis of lightning protection, Click Here

The physics of explaining how lightning reacts in air verses on a conductor is complicated and, as I stated, beyond the scope of this forum. Read the information in the links and you may get a better understanding of the issue.

Rcaman

Another close hit I guess. Saw the flash, heard the boom. DSL went down immediately. No dial tone. Thought the DSLAM might have taken the hit, then decided to check the fuses, etc. Found diatltone on the TelCo side of the block. Another of the old sneak fuses gone. That leaves me with one, if it's good.

PortaSystem unit held this time.

I've added a whole house surge unit inside the panel and a 'cheap' in-line RJ-11 protector/suppressor (so they say) between the Porta unit and the DSL modem.

Also replaced the UPS that powers the DSL modem and LAN switch. This one has a LAN In/Out port which claims to protect the LAN system. APC BN4001

Question is, where do I find more sneak fuses? I've lost contact with former suppliers.

Common searches don't find any from retail type suppliers.

What I'm finding are these in various ratings: https://www.amazon.com/gp/product/B...etails?ie=UTF8&me=&qid=1439978505&sr=1-3

Due to distance from the CO, they had the line voltage boosted to around 60 here before the new DSLAM went in a year ago. Haven't measured it recently. Not sure what ratings to look for in the ITX units and if they're sacrificial or if they reset themselves.

Opinions/thoughts on the Ditek DTK-SL130A ?

Or the ITX units mentioned above?