I'm using the Adtrans as PRI handoffs, they work perfect for that. Never
used the ATA portion though. Maybe I'll give that a shot.
On 2/18/2015 8:19 AM, Erich Kaiser wrote:
I agree Adtran is the way to go, especially when handing-off to legacy
phone systems with a PRI.
Erich Kaiser
North Central Tower Consulting
er...@northcentraltower.com <mailto:er...@northcentraltower.com>
Office: 630-621-4804
Cell: 630-777-9291
On Wed, Feb 18, 2015 at 6:09 AM, Adam Moffett <dmmoff...@gmail.com
<mailto:dmmoff...@gmail.com>> wrote:
Adtran Total Access has been my happiest multi line ATA
experience. Not cheap though....and not simple as the
Grandstream. In fact the config is obtuse in some ways. Greatest
chance that everything works though.
Most lines are loop start. I have never seen an ATA that
could do ground start.
Ground start was used by some PBX systems. The PBX would put
a ground on the tip side of the line telling the central
office to send dial tone.
If it works at all, it is working. You may have some RIP
silence timer type of problems.
And, if the line voltage is low, some things can get unhappy.
Check the ATA voltage on the pair when it is not off hook.
Some PBX type of equipment and older fax machines wanted to
see -48 volts nominal on the open line.
And, interrupting loop current is a way for a central office
to force a disconnect. If your voltage is too low, the PBX
may think you are sending a disconnect. And the ATA is
probably not interrupting loop current when the line
disconnects from the far end.
You may be sending data. Caller ID comes in a burst of Bell
202 FSK modulation. It sounds like data to a telco guy and in
fact it is data.
You may want to upgrade your SIP equipment. I am sure
somebody like Adtran or perhaps Tellabs has a carrier class
ATA. This one says it has -48 Volts on the loop:
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cata/187/1_0/english/administration/guide/sip/187adm80/a187_agCspc.html
-----Original Message----- From: Nate Burke
Sent: Tuesday, February 17, 2015 4:24 PM
To: Animal Farm
Subject: [AFMUG] OT: Types of Telephone lines
I'm trying to hook an ATA (Grandstream GXW4004) up to a Mitel
PBX. The
Mitel is expecting a 'Loop Start' line. I've read through the
Wikipedia
pages, and looked through the documentation. But I'm still
confused.
How do you tell if an ATA is producing lines that are 'Loop
Start' or
'Ground Start' Or is there something else it's doing.
The client is having issues where some calls are terminating
in the
middle of a conversation, or not disconnecting and leaving the
line
open. The PBX Contractor (the only way you can do anything
with a Mitel
PBX is through a Contractor) is telling them that they can make no
adjustments to the analog card in the Mitel, and it's not working
because our lines are 'Not up to industry standards for loop start
lines.' When they had ILEC POTS lines, the PBX was working
normally,
this just happened when we switched them to an ATA.
I have a ticket open with Grandstream, but I thought I'd ask
here. Is
there a way to test loop vs Ground start, and verify that the
ATA is up
to 'Industry standards'? The Contractor is Telling the client
that our
lines have low voltage, and there is "data" present on the line. I
wasn't on site when the tech was, so I have no idea what sort
of testing
he was doing.
Any telephone guys care to offer insight?
Thanks,
Nate
