[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: Differences between INT and MMT tables for address resolution?
Hi
Harald et al.
Though
I'm not exactly up-to-date on this, Astra TRP 1053 seems to carry INT for
unicast (19.2 DegEast, 10.77325 GHz, Horizontal, 22MS/s, 5/6) (a colleage told
me)
With
reference to Frank's earlier question: INT is now specified and officially
(ETSI) standardised in ETSI EN 301 192 V1.3.1 (2003-05). No other reference
should be used, unless the standard is updated, which can be "polled" from the
www.etsi.org site using the "data
broadcasting" string in the keyword search for "get a standard /
free download".
Given
that the specification only became an official ETSI standard in May, it would
suprise me if there are already many implemenations to choose from, since ETSI
works more towards concensus, standard, implementation, rather than the IETF,
implement, concensus, standard. (I am certain there are several
proprietry implementations based on one of the proposals before INT was
designed by concesus, which should migrate to INT over
time).
Does
anyone have an MMT reference (to standard or standards contribution)? Since it
is DVB-RCS specific, I had a look at the DVB-RC* ones listed at www.dvb.org (based on the "mmt" and
"multicast" strings):
*
DVB-RCC (return channel for cable): ES 200 800; TR101 196 says use EN 301
192 for MAC/IP mapping
*
DVB-RCL (return channel for LMDS): EN 301 199; TR 101 205 says use EN 301 192
for MAC/IP mapping
*
DVB-RCT (return channel for terrestrial) : EN 301 958 says use EN 301 192 for
MAC/IP mapping
*
DVB-RCG (GSM): EN 301 195 says nothing
*
DVB-RCP (PSTN/ISDN): ETS 300 801 says nothing
* DVB:RCCS (SMATV + measurement
guidelines): TR 101 201; TR 101 290 say nothing
DVB-RCS: Digital Video
Broadcasting (DVB); Interaction
channel for satellite distribution systems) documents say
this:
* ETSI
TR 101 790 V1.2.1 (2003-01) - guidelines - says a fair amount about
multicast including: Multicast PID Mapping Table (identified by the Elementary Loop with the stream
type = 0x05 and table id = 0xA7 in the RCS content descriptor) parsed
from PMT using IP/DVB Service linkage from RCS/Map Table. However, this
Multicast PID Mapping table is neither referenced nor
specified.
* ETSI EN 301 790 V1.3.1
(2003-03) - standard/specification - says
nothing
(nothing = nothing in respect to mmt & multicast
:)
Thus I
can conclude that MMT = Multicast PID Mapping
Table and was mentioned as
recently at January 2003, but not is in the DVB-RCS standard, only in the
guidelines. Does anyone have a reference to the
specification?
Cheers, Rod.
Hi all,
I'm looking for
some further info on the practical use of the INT tables. Does anybody
know of anyone who has implemented satellite multicast by using the INT
tables?
Seems to me the MMT tables
are used in at least a couple of systems. I'm however not sure how users
satisfaction is, as it seems to me it can't offer the same dynamics and
flexibility as a terrestrial IP multicast system.
Best regards,
/Harald
Please respond to
ip-dvb@erg.abdn.ac.uk
Sent by:
owner-ip-dvb@erg.abdn.ac.uk
To:
IP-dvb@erg.abdn.ac.uk
cc:
Subject:
Differences between
INT and MMT tables for address resolution?
Before delving into the DVB archives, does somebody
know:
a. Where the Multicast Map Table is
officially defined ? Is there a DVB
reference ?
b. What is the relation between the INT (IP/MAC Notification Table)
, as
defined in ETSI EN Draft 301 192 v1.3.1 (2002-12) ? In addition to
offering
unicast/MAC streams/platform concept, is it making the MMT
obsolete ? Is
there a reference to minutes of some DVB meeting that
explains the relation
between the two ?
My understanding is that EN 301 192 v1.3.1 (DVB data broadcasting)
document
now includes the document referenced in Gorries report from
Atlanta (ETSI EN
drTS 102 00X V0.4.2 (2002-07) "Specification for IP
Notification in DVB
Systems Use of the IP/MAC Notification
Table").
Regards,
Frank