<div dir="ltr">I see your point on the 10 PRI circuits. Below is a great clocking discussion from Derick Winkworth post on the voip-forum titled "network-clock-participate" subject that I think Gu Sang is trying to hit on. The logic surrounding his description seems to apply to this discussion:<br>
<br>Quote:<br><br><p>In telco-land, there is the idea that all network switches are
synchronized to the same clock. This is achieved by planning how a
clock is distributed through your network. The idea is that there is
one clock device in a network switch, called a PLL (phase-lock loop).
The PLL will receive/recover the master clock on one of its bearer
ports, or on a dedicated clock port called a BITS port.</p>
<p> </p>
<p>All other ports on that switch/device will be timed using this master clock.</p>
<p> </p>
<p>Cisco's ISRs were built using this model. There is one PLL on the
motherboard, called the network-clock. Modules on your router may
participate in this clocking scheme or not. Some have to, because they
don't have their own PLLs/clocks on-board. When you need/want a module
to participate in the network clock, you use the network-clock-select
command. You select the master clock with the network-clock-select
command. You can choose multiple master clocks and order them by
priority. Only one is active at a time.</p>
<p> </p>
<p>The implication here is that if you connect to multiple carriers
(and thus multiple clock domains), you may/will end up with clock slips
on one of the ports. Otherwise, you would set the telco port as the
master clock and then time the rest of your private ports off of this.
You may need to do this if you want the ISR to do TDM switching, for
instance.</p><p>End Quote<br></p><br><br><div class="gmail_quote">On Tue, Aug 26, 2008 at 7:08 PM, Gu Sang Jung <span dir="ltr"><<a href="mailto:gusangjung@yahoo.com">gusangjung@yahoo.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt;"><div>This is my two cents.<br>
<br>
The problem to load more than 10 PRIs will be timing issue.<br>
<br>
the currently. Cisco 3845 only support 10 Time clock domain. <br>
Hence, I designed to use only to max 10 PRIs into One 3845. If you have
different telco clock on one 3845, these number should be limited with
telco<br>
If you provide clock from telco switch, Please make sure this. Otherwise, Fax, or Modem could be has issue. <br>
</div><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt;"><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><div class="Ih2E3d">----- Original Message ----<br>From: Lelio Fulgenzi <<a href="mailto:lelio@uoguelph.ca" target="_blank">lelio@uoguelph.ca</a>><br>
To: Voice Noob <<a href="mailto:voicenoob@gmail.com" target="_blank">voicenoob@gmail.com</a>>; Mordechai <<a href="mailto:m.rabinovich@nves.ca" target="_blank">m.rabinovich@nves.ca</a>><br>Cc: <a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br>
</div><div><div></div><div class="Wj3C7c">Sent: Tuesday, August 26, 2008 3:57:47 PM<br>Subject: Re: [cisco-voip] Maximum number of T1 on 3845<br><br>
<div><font face="Arial" size="2"><a rel="nofollow" href="http://www.cisco.com/en/US/prod/collateral/routers/ps259/product_data_sheet0900aecd8057f2e0.pdf" target="_blank">http://www.cisco.com/en/US/prod/collateral/routers/ps259/product_data_sheet0900aecd8057f2e0.pdf</a></font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">i was referred to this by our SE. although the
table says the 3845 will support 24 T1/PRI ports, the max simultaneous
calls shows about 450 which is just under 20 ports (when dividing by 23, just
under 19 when dividing by 24).</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">hope this helps.</font></div>
<div> </div>
<div>--------------------------------------------------------------------------------<br>Lelio
Fulgenzi, B.A.<br>Senior Analyst (CCS) * University of Guelph * Guelph, Ontario
N1G 2W1<br>(519) 824-4120 x56354 (519) 767-1060 FAX
(JNHN)<br>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
<br>"Bad grammar makes me [sic]" - Tshirt<br></div>
<blockquote style="border-left: 2px solid rgb(0, 0, 0); padding-right: 0px; padding-left: 5px; margin-left: 5px; margin-right: 0px;">
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">----- Original Message ----- </div>
<div style="background: rgb(228, 228, 228) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
<b>From:</b>
<a rel="nofollow" title="voicenoob@gmail.com" href="mailto:voicenoob@gmail.com" target="_blank">Voice Noob</a>
</div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>To:</b> <a rel="nofollow" title="m.rabinovich@nves.ca" href="mailto:m.rabinovich@nves.ca" target="_blank">Mordechai</a> </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Cc:</b> <a rel="nofollow" title="cisco-voip@puck.nether.net" href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a> </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Sent:</b> Tuesday, August 26, 2008 5:54
PM</div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Subject:</b> Re: [cisco-voip] Maximum number
of T1 on 3845</div>
<div><br></div>
<div dir="ltr">No they don't. Where in the world did you get that
from????<br><br>
<div class="gmail_quote">On Tue, Aug 26, 2008 at 4:47 PM, Mordechai <span dir="ltr"><<a rel="nofollow" href="mailto:m.rabinovich@nves.ca" target="_blank">m.rabinovich@nves.ca</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">3845
supports at least 16, more likely 24 pris if I remember right. We
chose<br>them over 6509e with CMM blades because they provided appropriate
density<br>and a newer voip platform.<br>
<div>
<div></div>
<div><br>-----Original Message-----<br>From: <a rel="nofollow" href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a><br>[mailto:<a rel="nofollow" href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a>]
On Behalf Of Matthew Saskin<br>Sent: Tuesday, August 26, 2008 3:25 PM<br>To:
Voice Noob<br>Cc: <a rel="nofollow" href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br>Subject:
Re: [cisco-voip] Maximum number of T1 on 3845<br><br>For one particular
client I've got a series of 8 x 3845's with 12 PRI's<br>+ 230 configured
xcoding sessions per device and no cpu/memory issues to<br>speak of.
Nominal CPU utilization is around 35% with peaks of about
50%<br>during peak call times.<br><br>-matt<br><br>Voice Noob
wrote:<br>><br>> I think that device will support 12 or 14 PRI's.
Don't remember off hand.<br>> On Tue, Aug 26, 2008 at 11:20 AM, Aman
Chugh <<a rel="nofollow" href="mailto:aman.chugh@gmail.com" target="_blank">aman.chugh@gmail.com</a><br>>
<mailto:<a rel="nofollow" href="mailto:aman.chugh@gmail.com" target="_blank">aman.chugh@gmail.com</a>>>
wrote:<br>><br>><br>> Just wanted to know if I can
have 8 T1 pri terminate on Cisco 3845 ,<br>> any one
already doing the same , any caveats that I need to be aware<br>>
of , apart from the AS5300/5400 , what are my other options
to<br>> terminate 8 T1 on a single router, I am putting in
6 PVDM2-64 to<br>> support this
configuration.<br>><br>><br>> Aman<br>><br>>
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