[afnog] Juniper MX "timing support" = ?

[Jide Akintola]

Hi Frank,

Both Kofi and Mark have pretty much covered most of this. But from implementation perspective, for SyncE you would need a fork lift upgrade as all devices along the part need to support this. On the other hand, PTP 1588 packets are IP encapsulated and  would be forwarded like any other IP packets. The MX-80-T and all other MX with the "proper MPC" would hardware timestamp the packets as it crosses the router. Otherwise they would just forward the packet as normal IP packet without time-stamping it.

Hope this helps? 

Many thanks. 
 
Cheers, 
 
Jide

--------------------------------------------
On Wed, 7/1/15, Kofi ANSA AKUFO <kofi.ansa at gmail.com> wrote:

 Subject: Re: [afnog] Juniper MX "timing support" = ?
 To: "Frank Habicht" <geier at geier.ne.tz>
 Cc: "afnog" <afnog at afnog.org>
 Date: Wednesday, 7 January, 2015, 8:36
 
 Hi
 Frank
 
 Many happy
 returns !!!
 
 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.
 
 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.
 
 SONET/SDH technologies are
 traditionally used to provide these applications (e.g.
 mobile backhauling) due to native support for clocking. 
 
 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).
 
 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;
 
 1. Synchronous
 Ethernet (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 Synchronous
 Ethernet Overview for more info
 
 2.  Precision
 Time Protocol ( IEEE 1588-2008) - See more from
 Juniper's
 Precision Time Protocol Overview doc page
 
 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.
 
 Hope it helps.
 
 Cheers
 
 K.
 
 On 7 January 2015 at 09:49,
 Frank Habicht <geier at geier.ne.tz>
 wrote:
 Hi all,
 
 
 
 happy new year to all!
 
 
 
 Apparently my googl'ing abilities are insufficient, so
 let me ask you for help.
 
 
 
 The Juniper MX 80 router is available with and without
 "timing support".
 
 While the other "midrange" MX5 - MX40 are only
 _with_ timing support.
 
  ... it appears from a (possibly outdated) document, which
 I found on the
 
      streets ...   ;-)
 
   (maybe that's wrong..?)
 
 
 
 While it seems to smell a bit like SDH, I'd appreciate
 more hints, pointers
 
 or confirmation about what the "timing support"
 means and does.
 
 
 
 Thanks,
 
 Frank
 
 
 
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