SLMO24

[luvarne]

What is the maximum distance that the SLMO24 (Q2168-X) could accommodate?

 

[donb01]

I know the older 9006 cards could do about 2000 feet, and I probably have some stations on my SLMO running at least half that. Keep in mind if you go between separated buildings it's a good idea to have circuit protectors on both ends of the link. I have adjacent buildings where I have 100 pair cables run between them and I have "customer network interface" equipment installed on both ends. Keeps you from spiking your line cards.

 

[sbcsu]

You can get an SLMQ? to go further if you have distance problems.
Double up the pairs and try it with SLMO first

 

[cody64]

Hi,

I don't know what platform you're using these cards in but for the 3000 they allow up to 1000 meters for a digital port.

Cheers

Cody64

 

[luvarne]

So what's the distance the SLMQ can accommodate? Does the command for adding new stations the same? (i.e. add-sbcsu?)

 

[luvarne]

we're using hipath 4000 ver 5

 

[sbcsu]

I don't have the distance info to hand at the moment but will try and find out.
I used one before to provide extensions out from a head office to a warehouse. You have to use power supplies on the phones. The commands are the same but the phones are added on that specific card.
Should also work on V5
Will check the distances, not sure myself because the pairs we had were going through the local PTT exchange and we did not measure the distance.

 

[sbcsu]

Link
This says 5.5 to 9 Kilometers

 

[luvarne]

the power supply is a very big disadvantage... we probably can't use this card if it's mandatory for us to use an external power... the analog can accommodate upto 2.2 km but we need it digital. Any alternative cards out there?

 

[obtsystems]

Why not use ip phones?

 

[luvarne]

we intend to use more than 300 stations... IP phones have more requirements than the regular digital phones (i.e. PoE Switches, cost of IP phones...)

 

[sbcsu]

Well then if they are in the same remote area you could fit a remote shelf.

 

[luvarne]

It's not too remote, the estimated cable distance is only about 1.96 Km. I was wondering if the SLMO card could accommodate this distance.

 

[sbcsu]

As said previously you could try doubling up the pair feeding the phone and test.

 

[luvarne]

i thought SLMO cards uses only 1 pair to work? Do you mean iL use two wires for each conducting pin? Could increasing conductivity really accommodate this? Would it have the same effect if i were to use a thicker cable conductor?

 

[sbcsu]

It is not possible for anyone here to find out how far away the extensions will be from your main system.
The existing pairs to the remote site could be going 'around the houses' or via exchanges.
To increase the current carrying capacity, yes both of those suggestions would assist.
Use 2 pairs from the main site to the remote site and/or use a thicker cable conductor.
However it will not fix it if they are too far away.
The SLMO supplies a proprietary ISDN basic rate 2 bearer channels and 1 data channel.
You could use an analogue meter to estimate the distance but that is really only telling you what you already know.
Please go ahead and try it with the Optiset.
Failing that try an analogue extension and see if that will work?

 

[luvarne]

we've tried upto 2.3 km with the analog, and it works.. the max distance we have for a digital line is only about 900 meters.. i was skeptical whether the new location we have, which is 1.8 km, would still accommodate the digital line...

 

[donb01]

Is that the Max distance you have used so far for a digital line, or is it the maximum distance you could get one to work?? If you just haven't tried further than that then you have a chance, but it that is the furthest you could make it work, expecting that distance to double is unlikely.

You can purchase test equipment that you can connect to the line to determine how long the cable run is, as long as there isn't anything else in the line like a load coil or something that might affect the test.

My suggestion would to just hook the sucker up and see if it works - if it works is all you really care about. Using heavier cable will usually help, and twisting two pairs together (or laying your cross connect wire across 2 pairs) usually will help too. Be sure to also use heavier cross connect wire and not the cheap skimpy stuff.