<div dir="ltr">Hi Frank<br><div><br>Many happy returns !!!<br><br></div><div>The "timing support" is an Ethernet Equipment Clock (EEC) implementatation functionality in Juniper routers (e.g. as you may have noticed with the T in the model names - MX5-T, MX10-T, MX40-T and MX80-T). Other vendors have their own implementation.<br><br></div><div>Circuit switched and or circuit "emulated" networks (mobile radio access technologies), require time synchronization and in some technologies such as wireless (i.e. frequency division duplex FDD and time division duplex TDD) the need for phase alignment and correct time.<br><br></div><div>SONET/SDH technologies are traditionally used to provide these applications (e.g. mobile backhauling) due to native support for clocking. <br><br>In recent times the need to reduce costs (i.e and increase capacity) and to improve flexibility has triggered the use of packet-based or switched networks to support these applications (i.e mobile backhauling).<br><br></div><div>Now ethernet which is a packet switched technology do not carry clock synchronization information natively. The notable extensions to support synchronization in packet-based network technology - typically ethenet may be as follows;<br><br></div><div>1. <a href="http://en.wikipedia.org/wiki/Synchronous_Ethernet">Synchronous Ethernet</a> (ITU-T G.8261 and ITU-T G.8264) is a physical
layer technology that functions regardless of the network load and
supports hop-by-hop frequency transfer, where all interfaces on the
trail must support Synchronous Etherne. Refer to Juniper's <a href="http://www.juniper.net/documentation/en_US/junos12.3/topics/concept/ethernet-synchronous-overview.html">Synchronous Ethernet Overview</a> for more info<br><br>2. <a href="http://en.wikipedia.org/wiki/Precision_Time_Protocol">Precision Time Protocol </a>( IEEE 1588-2008)<b> - </b>See more from <a href="http://www.juniper.net/documentation/en_US/junos12.3/topics/concept/ptp-overview.html">Juniper's Precision Time Protocol Overview</a> doc page<br></div><div><br></div><div>In short "timing support" functionality enables you to deliver
synchronization services that meet the requirements of the present-day
mobile network, as well as future Long Term Evolution (LTE)–based
infrastructures.<br><br></div><div>Hope it helps.<br></div><div><div><div class="gmail_extra"><br></div><div class="gmail_extra">Cheers<br><br></div><div class="gmail_extra">K.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On 7 January 2015 at 09:49, Frank Habicht <span dir="ltr"><<a href="mailto:geier@geier.ne.tz" target="_blank">geier@geier.ne.tz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi all,<br>
<br>
happy new year to all!<br>
<br>
Apparently my googl'ing abilities are insufficient, so let me ask you for help.<br>
<br>
The Juniper MX 80 router is available with and without "timing support".<br>
While the other "midrange" MX5 - MX40 are only _with_ timing support.<br>
... it appears from a (possibly outdated) document, which I found on the<br>
streets ... ;-)<br>
(maybe that's wrong..?)<br>
<br>
While it seems to smell a bit like SDH, I'd appreciate more hints, pointers<br>
or confirmation about what the "timing support" means and does.<br>
<br>
Thanks,<br>
Frank<br>
<br>
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</blockquote></div><br></div></div></div></div>