[Asterisk-Users] Siemens EWSD 13

[Storer, Darren]

Hi,

I had exactly the same symptoms today with a co-located * connected to a
Public Switch here in the UK. The problem was solved by insisting that the
Telco turned on CRC4 at their end and then, after an 'init 6', layer two
settled down on both systems.

I was taught that if you are connecting to a full specification Q.931
circuit, CRC4 should be enabled by default; in the event that one end does
not support CRC4 the other end should auto-negotiate back and the circuit
should still align without problems. Having said all of this I have yet to
see auto-negotiation of CRC4 on any equipment (Public Network or CPE) and
suspect that I was not told the truth in the first place...

Selection of CRC4 seems to be random from Telco to Telco even on an install
by install basis within the same Carrier. It's the first thing to check when
new kit appears to be unstable..

HTH

Darren
--
Comgate
Telco>Internet<Broadcast

-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of
asterisk at geek.be
Sent: 07 April 2004 14:59
To: asterisk-users at lists.digium.com
Subject: [Asterisk-Users] Siemens EWSD 13


Hi all,

Has anyone got any experience with hooking Asterisk up with a
Siemens EWSD 13 switch over a E1/PRI ?
We're located in Belgium (Europe) and one of our telecom partners
uses this switch.

We connected one of our TE410P ports with their switch, but the status
light on the TE410P card keeps blinking red.
On their side they are getting a DSA (distance service alarm) error, so
this normally means the devices 'see' eachother.. but there are still
problems with the signalling.

Our config below is the same as we are using for MCI, one of our other
telecom partners.

We tried changing the LBO and timing, but no luck.
As you see the signalling is carried over channel 16 (default).

TX and RX have also been regularly switched, so no luck..

Their switch is providing the timing.

The telecom operator has double checked the asterisk config several
times, and it's conform to their setup.

The only thing they couldn't find in the Asterisk config is a
'multiframing' option. But I presume this is automatically detected or
set by default ?
They also tried normal/single(?) framing, but no difference.

The card has also been tested with our MCI E1, and works flawlessly, so
no hardware issue.

Anyone got any further ideas ?

Any info or help greatly appreciated!

Our config,

*** zaptel.conf ***
span=1,1,6,ccs,hdb3,crc4,yellow
bchan=1-15
bchan=17-31
dchan=16

*** zapata.conf ***
[channels]
switchtype=euroisdn
signalling=pri_cpe
pridialplan=unknown

group=1
channel => 1-15,17-31

<other zapata standard config>



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