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Hot Summer
join:2014-11-17
Canada

Hot Summer

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Grandstream HT502

I've hunted around, and even read the user manual from the OEM, but there is one piece of info I cannot find.

Just how many phones can you hang off one port of this unit???

Anybody know?
InvalidError
join:2008-02-03

1 recommendation

InvalidError

Member

It depends on the phones' REN - Ringer Equivalent Number - and whatever the ATA is able to drive.

A typical phone circuit should be able to drive 5-8 RENs and a typical phone should be less than 1 REN, so you should typically be able to run at least five phones but possibly 10+ since electronic ringers are usually 0.5-0.8 REN.

TSI Andre
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join:2008-06-03
Chatham, ON

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It's one port but you can use a base station. I have a set of cordless phones and one requires to be plugged in. The remaining 3 are just wireless to that station.
Hot Summer
join:2014-11-17
Canada

Hot Summer

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said by TSI Andre:

It's one port but you can use a base station. I have a set of cordless phones and one requires to be plugged in. The remaining 3 are just wireless to that station.

Guess I should be more precise in my question.
Yes I know you can plug in one base station that can
handle X number of handsets.

But I'm looking for that REN number InvalidError speaks of.
Trying to see if the HT502 will float "5"ish separate
"lined" phones.

Any idea on that number?
notfred
join:2012-09-15

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A quick Google says that the HT502 supplies 3.0 REN. The phones should all have little stickers on their underside somewhere that say how many REN they need. Add up all the phone RENs and if it is less than the 3.0 then you are good - they will all ring.
Hot Summer
join:2014-11-17
Canada

Hot Summer

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said by notfred:

A quick Google says that the HT502 supplies 3.0 REN. The phones should all have little stickers on their underside somewhere that say how many REN they need. Add up all the phone RENs and if it is less than the 3.0 then you are good - they will all ring.

ThankYou!

Now I wonder, is that 3REN per FXS port or
3REN across both FXS ports???

TypeS
join:2012-12-17
London, ON

TypeS

Member

Page 14 of the user manual for the HT502 states:
quote:
Short Haul Loop | 3RENs, Up to 150feet on 24 AWG wire

You'd probably have to contact Grandstream to for more detail.
notfred
join:2012-09-15

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I would suspect 3REN per FXS port - they are independent ringers. I could see an overall power limitation that may reduce that. You do know that each FXS port is a different phone "line"?

LazMan
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join:2003-03-26
Beverly Hills, CA

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Modern phones are well less than 1 REN. A Ringer Equivalency goes back to the old days of electro-mechanical ringers...

For instance, my Panasonic cordless base-station has a REN of 0.1

I've got 3 phones, including a 1952 Western Electric 500 desk-phone (that's got a REN of 1, but it's amazing sounding, and beautiful, too) - hung off port 1 on my HT502; a couple of modern-ish phones hung off port 2... No issues.

Short answer - assuming it's not phones with mechanical ringers, or neon tubes (old Princess sets, for instance) - there's going to be no problem hanging 4-5 or more modern phones off the ATA...

RizzleQ
Cunningham's Law Enthusiast
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join:2006-01-12
Windsor, ON

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TSI tech support can learn a thing or two from this thread. I know I sure did.

TSI Andre
Premium Member
join:2008-06-03
Chatham, ON

TSI Andre

Premium Member

I agree! I will pass this on to our communications group
Hot Summer
join:2014-11-17
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said by notfred:

I would suspect 3REN per FXS port - they are independent ringers. I could see an overall power limitation that may reduce that. You do know that each FXS port is a different phone "line"?

Yup, I know that. Interesting feature, compared to other products.
My last question, would be;

If you turn OFF the ringers on say all phones, except say 1,
I wonder how many separate phones such a unit could handle?

Given that many phones are mains powered, I imagine line loading
ought to be pretty light... or at least as light as can be tolerated
by a PSTN switch...