[VoiceOps] PRI Gateway Supporting 1 - 3 PRI's

Brian R briansupport at hotmail.com
Wed Dec 11 11:39:40 EST 2013

You could look at Adtran Netvantas.  We are starting to deploy these and many have add in cards (8x T1s per card).  
**We have not used them to turn up PRIs yet, still using the TA900 series.  We are in the process of vetting and deploying the Netvantas (8044Ms in particular) for internet and will be turning voice up on them after.**  
We are home running the T1s (Pseudowire) back to an OptiPlex (6100 MX) and that is using physical OC/DS (3 or 12) back to our phone switch (the physical connection was not configured by me so I am not up to speed on it yet).
Date: Tue, 10 Dec 2013 16:58:21 -0800
From: mclark at phyber.com
To: voiceops at voiceops.org
Subject: Re: [VoiceOps] PRI Gateway Supporting 1 - 3 PRI's

So for installations requiring more than 2x T1s what's the recommendation?
Max Clark
Managing Director | Phyber Communications

+1 (213) 929 1700 | mclark at phyber.com

Visit us at www.phyber.com

Hosting | Network | Voice

On Mon, Dec 9, 2013 at 8:12 PM, Jay Hennigan <jay at west.net> wrote:

On 12/9/13 4:52 PM, Max Clark wrote:

> I'm assuming that the Adtran TA900 has a high precision clock. Do they

> come in 4x PRI configurations?

It has an internal oscillator for T1 clock, but not of BITS type

accuracy.  You'll get slips if you have a BITS-timed T1 connected with

the Adtran set to internal clock.  Of course you can set it to

synchronize from line.

We've never had any problems driving a stand-alone PBX from its internal


I haven't evaluated the precision of its time-of-day clock.  It supports

NTP so this hasn't been an issue.

Maximum number of PRIs supported is two on the -e models, even though

they have four T1 interfaces, only two of them support TDM voice.  The

other two (or all four if you want) can be used for data as PPP, HDLC,

or frame-relay.


Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net

Impulse Internet Service  -  http://www.impulse.net/

Your local telephone and internet company - 805 884-6323 - WB6RDV


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