<div>Hi Wes:</div>
<div> </div>
<div>Below are the config snippets you requested. I dont see any issues with slips.</div>
<div> </div>
<div>Thanks, Jeff</div>
<div> </div>
<div> </div>
<div>network-clock-participate T1 1/0<br>network-clock-participate T1 1/1<br>network-clock-select 1 T1 1/1</div>
<div> </div>
<div>controller T1 1/0<br> framing esf<br> clock source internal<br> linecode b8zs<br> cablelength short 133<br> pri-group timeslots 1-24<br> description PRI TO PBX<br>!<br>controller T1 1/1<br> framing esf<br> linecode b8zs<br>
channel-group 0 timeslots 1-24<br> description T1 TO MPLS Provider</div>
<div>interface Serial1/0:23</div>
<div><br> description PRI TO PBX<br> no ip address<br> encapsulation hdlc<br> no logging event link-status<br> isdn switch-type primary-ni<br> isdn protocol-emulate network<br> isdn incoming-voice voice<br> no cdp enable<br>
!<br>interface Serial1/1:0<br> description T1 to MPLS Provider<br> ip address x.x.x.x 255.255.255.252<br> no logging event link-status<br> service-policy output SERIAL_DYNAMIC_1536</div>
<div>voice-port 1/0:23</div>
<div> </div>
<div>router#sh controllers t1<br>T1 1/0 is up.<br> Applique type is Channelized T1<br> Cablelength is short 133<br> Description: PRI TO PBX<br> No alarms detected.<br> alarm-trigger is not set<br> Soaking time: 3, Clearance time: 10<br>
AIS State:Clear LOS State:Clear LOF State:Clear <br> RX level = 0dB<br> Framing is ESF, Line Code is B8ZS, Clock Source is Internal.<br> Data in current interval (513 seconds elapsed):<br> 0 Line Code Violations, 0 Path Code Violations<br>
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins<br> 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs<br> Total Data (last 24 hours)<br> 0 Line Code Violations, 0 Path Code Violations,<br>
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,<br> 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs</div>
<div><br>T1 1/1 is up.<br> Applique type is Channelized T1<br> Cablelength is long gain36 0db<br> Description: T1 TO MPLS PROVIDER</div>
<div> No alarms detected.<br> alarm-trigger is not set<br> Soaking time: 3, Clearance time: 10<br> AIS State:Clear LOS State:Clear LOF State:Clear <br> RX level = -1dB<br> Framing is ESF, Line Code is B8ZS, Clock Source is Line.<br>
Data in current interval (514 seconds elapsed):<br> 0 Line Code Violations, 0 Path Code Violations<br> 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins<br> 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs<br>
Total Data (last 24 hours)<br> 0 Line Code Violations, 0 Path Code Violations,<br> 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,<br> 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs</div>
<div> </div>
<div><br>router#sh voice port 1/0:23</div>
<div>ISDN 1/0:23 Slot is 1, Sub-unit is 0, Port is 23<br> Type of VoicePort is ISDN-VOICE<br> Operation State is DORMANT<br> Administrative State is UP<br> The Last Interface Down Failure Cause is Administrative Shutdown<br>
Description is not set<br> Noise Regeneration is enabled<br> Non Linear Processing is enabled<br> Non Linear Mute is disabled<br> Non Linear Threshold is -21 dB<br> Music On Hold Threshold is Set to -38 dBm<br> In Gain is Set to 0 dB<br>
Out Attenuation is Set to 0 dB<br> Echo Cancellation is enabled<br> Echo Cancellation NLP mute is disabled<br> Echo Cancellation NLP threshold is -21 dB<br> Echo Cancel Coverage is set to 64 ms<br> Echo Cancel worst case ERL is set to 6 dB<br>
Playout-delay Mode is set to adaptive<br> Playout-delay Nominal is set to 60 ms<br> Playout-delay Maximum is set to 250 ms<br> Playout-delay Minimum mode is set to default, value 40 ms <br> Playout-delay Fax is set to 300 ms<br>
Connection Mode is normal<br> Connection Number is not set<br> Initial Time Out is set to 10 s<br> Interdigit Time Out is set to 10 s<br> Call Disconnect Time Out is set to 60 s<br> Ringing Time Out is set to 180 s<br> Wait Release Time Out is set to 30 s<br>
Companding Type is u-law<br> Region Tone is set for US<br> Station name None, Station number None<br> Translation profile (Incoming): <br> Translation profile (Outgoing): <br> Voice class called number pool: </div>
<div><br> DS0 channel specific status info:<br> IN OUT<br> PORT CH SIG-TYPE OPER STATUS STATUS TIP RING<br> 1/0:23 01 isdn-voice dorm none none <br>
1/0:23 02 isdn-voice up none none <br> 1/0:23 03 isdn-voice dorm none none <br> 1/0:23 04 isdn-voice dorm none none <br>
1/0:23 05 isdn-voice dorm none none <br> 1/0:23 06 isdn-voice dorm none none <br> 1/0:23 07 isdn-voice dorm none none <br>
1/0:23 08 isdn-voice dorm none none <br> 1/0:23 09 isdn-voice dorm none none <br> 1/0:23 10 isdn-voice dorm none none <br>
1/0:23 11 isdn-voice dorm none none <br> 1/0:23 12 isdn-voice dorm none none <br> 1/0:23 13 isdn-voice dorm none none <br>
1/0:23 14 isdn-voice dorm none none <br> 1/0:23 15 isdn-voice dorm none none <br> 1/0:23 16 isdn-voice dorm none none <br>
1/0:23 17 isdn-voice dorm none none <br> 1/0:23 18 isdn-voice dorm none none <br> 1/0:23 19 isdn-voice dorm none none <br>
1/0:23 20 isdn-voice dorm none none <br> 1/0:23 21 isdn-voice dorm none none <br> 1/0:23 22 isdn-voice dorm none none <br>
1/0:23 23 isdn-voice dorm none none </div>
<div> </div>
<div>router#sh network-clocks <br> Network Clock Configuration <br> --------------------------- <br> Priority Clock Source Clock State Clock Type </div>
<div> 1 T1 1/1 GOOD T1 <br> 6 Backplane GOOD PLL </div>
<div> Current Primary Clock Source <br> --------------------------- <br> Priority Clock Source Clock State Clock Type </div>
<div> 1 T1 1/1 GOOD T1 </div>
<div> </div>
<div> </div>
<div>router#sh ver<br>Cisco IOS Software, 2400 Software (C2430-IS-M), Version 12.4(15)T7, RELEASE SOFTWARE (fc3)<br>Technical Support: <a href="http://www.cisco.com/techsupport">http://www.cisco.com/techsupport</a><br>Copyright (c) 1986-2008 by Cisco Systems, Inc.<br>
Compiled Wed 13-Aug-08 15:51 by prod_rel_team</div>
<div>ROM: System Bootstrap, Version 12.4(13r)T7, RELEASE SOFTWARE (fc1)</div>
<div>UnitedPrairie_Owatonna uptime is 2 weeks, 16 hours, 2 minutes<br>System returned to ROM by power-on<br>System image file is "flash:c2430-is-mz.124-15.T7.bin"</div>
<div>Cisco IAD2431 (R527x) processor (revision 4.1) with 119808K/11264K bytes of memory.<br>Processor board ID FHK1238F1MR<br>R527x CPU at 225MHz, Implementation 40, Rev 3.1<br>2 FastEthernet interfaces<br>25 Serial interfaces<br>
2 Channelized T1/PRI ports<br>DRAM configuration is 64 bits wide with parity disabled.<br>63K bytes of non-volatile configuration memory.<br>System fpga version is 250027<br>System readonly fpga version is 250027<br>Option for system fpga is 'system'.<br>
62720K bytes of ATA System CompactFlash (Read/Write)</div>
<div>Configuration register is 0x101 </div>
<div><br> </div>
<div> </div>
<div> </div>
<div><br> </div>
<div class="gmail_quote">On Wed, May 6, 2009 at 9:32 PM, Wes Sisk <span dir="ltr"><<a href="mailto:wsisk@cisco.com">wsisk@cisco.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div text="#000000" bgcolor="#ffffff">So you have 2 T1's terminated on the same IAD? Are they in the same module or what? There are some interesting things that happen with multiple clocked circuits terminated on these boxes. Can you clarify which interfaces you are using for what on the IAD? Config snippets always welcome.<br>
<font color="#888888"><br>/Wes</font>
<div>
<div></div>
<div class="h5"><br><br><br>On Wednesday, May 06, 2009 5:00:03 PM, Jeff Anderson <a href="mailto:ciscoplumber@gmail.com" target="_blank"><ciscoplumber@gmail.com></a> wrote:<br></div></div>
<blockquote type="cite">
<div>
<div></div>
<div class="h5">
<div>I have a couple of customers who are experiencing poor audio using an IAD to connect their PBX to our h.323 PSTN GW.</div>
<div> </div>
<div>Basic Layout.</div>
<div> </div>
<div>Customer PBX PRI > IAD PRI (Network-emulate) converted to VoIP > MPLS enabled T1 > Core > AS5850 (VoIP converted to TDM) > PSTN.</div>
<div> </div>
<div>The customer reports that poor audio is experienced inbound into their PBX. They say their outbound audio is okay. This doesnt happen on every call but we do have more than one customer reporting the issue.</div>
<div> </div>
<div>The audio can be described anywhere from echo, cutting out or distorted audio. The problem has also been reported by users who have 38xx series gateways so i dont think the problem is IAD specific. The AS5850 is a shared device used by many different customers, the majority of which connect using Cisco IP phones and this demographic of customers are not reporting the problem.</div>
<div> </div>
<div>I have done packet captures on the AS5850 and there is no packet loss reported, the packets arrive in sequence and the jitter is very low.</div>
<div> </div>
<div>In my testing, I have found double-talk to cause the far end audio (AS5850) to cut-out. All the packets arrive but they contain a payload value of 7F. Some improvement can be made to this condition by disabling non-linear progression. </div>
<div> </div>
<div> </div>
<div> </div>
<div>My questions for the community are related to experiences or lessons learned from using PRI network emulate.</div>
<div> </div>
<div>Can there be too many echo cancellers in the call flow? (i.e. Customer PBX UC500 with Cisco PRI, IAD PRI, AS5850 PRI all with echo cancellers)</div>
<div> </div>
<div>Does the cable length command have any bearing on voice quality?</div>
<div> </div>
<div>Are there any special commands i should enter when connecting back to back wth a T1 cable (echo-cancel coverage, nlp, etc)?</div>
<div> </div>
<div>Is a 2 pair sheilded T1 cable necessary for the PRI back to back connection of less than 20 ft?</div>
<div> </div>
<div> </div>
<div>Any insight or suggestions would be greatly appreciated. </div>
<div> </div>
<div>Thanks,</div>
<div> </div>
<div>Jeff </div>
<div> </div>
<div> </div></div></div><pre><hr width="90%" size="4"><div class="im">
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