Will this be beyond the knowledge of STW?
OK, seeing as this is the fountain of all knowledge, I thought I'd ask.
Does anybody know what the maximum distance between the telcos NTE and a PBX is for an ISDN30 (Q.Sig)? Also, what difference would using shielded CAT6 versus unshielded make?
I await amazementPosted 7 years agoMrGrimMember
It depends on where the cable runs from and to, how it is terminated, how much interference is likely to be experienced on the run – will the cabling be bundled running above/below multiple rooms?
Because you are using Q.931, the quality of the link is really important. Q.931 doesn't re-transmit and there is no flow control.
Cat6 should be fine for 2-300 metres, but in my opinion you want to make it as short as possible.Posted 7 years ago
Mr Grim speaks sense
Trouble is it's a new building in Luxembourg that I've never seen before. Our office space is on 2nd Floor and the NTE is in the 'basement' so lord only knows how long the run is. No doubt the run will be shared with 3 phase and all sorts of other nastiness! All I know is when I install my gateway out there, if I have any problems with the PRI everyone will assume it's my fault. Think I'll have to raise this as a risk in the morning!Posted 7 years agoCletusMember
Check out page 4 section 4-4 of the document at the link below:
The requirements for the cabling between the CPE and the NTTA are specified in prEN 50098-2. As an example, these requirements will be met using unscreened twisted pair (UTP) Class 5 cable of up to 200m in length.
So it looks like 200 Metres for Cat 5. If you want to know more you can purchase the full standard document at the link below:
I have installed quite a few Cisco gateways in similar circumstances to what you describe and have not had any problems to date.Posted 7 years ago
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