Ascend Archive
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: (ASCEND) Lucent -=-> Ascend --> ? (fwd)
Here's a question --
why no HDLC encap on leased T1 connections with the 8t1-card for the TNT?
Does the PM-4 support HDLC on T1's? In my opinion PPP on a T1 is a p.i.t.a.
to get working properly and continuously.
I have several customers who I have a heck of a time getting back online
after their connection goes down -- and then, after a few hours or so, all
of the sudden the connection is re-established. Sometimes I can force the
issue by downing the T1, but the same customers never had problems when I
used HDLC on my Cisco's.
Any ideas or suggestions?
Dave Langlands
--
dsl@uss.net
-----Original Message-----
From: MegaZone <megazone@megazone.org>
To: Ascend Users <ascend-users@bungi.com>
Date: Thursday, September 03, 1998 7:38 PM
Subject: Re: (ASCEND) Lucent -=-> Ascend --> ? (fwd)
>Once upon a time Jason Nealis shaped the electrons to say...
>>In relation to the PM4 and TNT, What truly is the advantage of
>>the PM4 over the TNT? If it's modem ports, I'm sure the next generation
>
>Jason asked, I'm answering. If you don't want to see a data dump on the
PM-4,
>I'd skip the rest.
>
>The TNT has a 155Mbps backplane - the PM-4 has a 5Gbps ATM backplane, a
>minimum of 155Mbps PER SLOT. 10 slots.
>
>155Mbps 155Mbps 155Mbps 155Mbps manager 155Mbps 622Mbps 155Mbps 155Mbps
155Mbps
> special manager
>
>The 'special' slot has additional connectors, it has been designed for a
>3 T3 demux card, the next level for the PM-4. The 5th slot is dedicated to
>the management card. The 6th slot is a standard slot OR a backup manager
>card, the 7th slot cango to OC-12, it has a 622Mbps connection.
>
>Right now a PM-4 with 9 media cards and 1 manager card can take 864 DS0s -
>all 864 can be modems, ISDN, etc. Each media card is self containted with
>4 T1s and 98 modems (they included 2 spares on board). The next generation
>is supposed to triple that to 12 T1s on a card.
>
>To use T3 you can install a T3 demux card and 7 media cards for 672 modems.
>With the management card there is a slot left for whatever.
>
>Next gen would be the 3 T3 demux card and 7 of the higher density cardcs
for
>2016 modems in one chassis. I really expect anyone putting that many eggs
>in one basket to use the remaining slot for the backup management card.
>
>The next step, if the market ever supports it, would likely be a T3 AND
modems
>on a single card. That is a somewhat frightening thought. And the PM-4
>has the ability to handle *three* T3s PER SLOT.
>
>Now, the TNT webpages still say a max of 288 modems per chassis - isn't
that
>out of date. I thought they can to 672 (A t3) with TWO chassis now, which
>implies at LEAST 336 per chassis. Jason, didn't you tell me the TNT upped
>modem density beyond 288? Of course the webpages also still say the TNT
does
>BGP. ;-) <URL:http://www.ascend.com/621.html>
>
>Other interfaces that are coming as DS3 and OC-3 for ATM, SONET, etc. xDSL
>is in the works - I expect to see a WildWire server card. VOIP/FOIP is in
>the works. The next generation of Lucent DSP, the 16000 series (the
current
>are the 1600 series), is being used by both their VOIP/FOIP people and the
>modem people. The expectation being that the same card will be able to
>do either service, strictly a software issue. A dedicated T3 (as in not a
>demux card, but a T3 card designed for non-modem use - HDLC/ISDN, leased
lines,
>etc only) is a safe bet. And the 100baseTX ethernet is already a daughter
>card on the management board that speaks 155Mbps ATM to the main card. It
>would just be a form factor change to produce a 100baseTX media card as a
>stand alone. Oh, and the 100baseTX port is full duplex. ;-) A processor
>card is also expected - designed to be a dedicated work horse for tunneling
>and encryption, and anything else that might require a lot of CPU. Right
>now there is a 4 port NO modem card - basically the modem card without any
>of the DSPs for leased line or ISDN only work, and there is talk of a 10 or
>12 port NO modem card to follow. That would just be cloning the existing
>traces I'd expect - 12 ports with modems is more work, as it is waiting on
>the higher density DSPs
>
>Oh, there is a three E1 card and an E3 demux too, for those who need them.
>
>And remember ComOS is ComOS - RIPv1, OSPFv2 with NSSA, BGP4, Frame Relay,
PPP,
>BACP, L2TP, IPIP, NAT - everything - is included. No options. I believe
>IPSec encryption - now in beta on the PM-3 with the MIPS Accelerator
board -
>is waiting on the processor board. Stac, a daughter card option on the
>PM-3, is just included. The media cards have integral Stac HiFn chips.
>It is also a distributed routing architecture. The management card runs
>the active protocols, but distributes the routing lookup tables to the
>other cards, which have their own route processors. So if traffic is
>coming in and out of WAN ports, it doesn't need to go via the management
>card. Cooling is lower front to upper rear - no worries about exhaust
>heating the next box over. N+1 power supply design, 3 small hot swappable
>units, 1 needed for each 5 slots, the 3rd is backup. The entire chassis is
>-48vDC native, so if you are in a telco space with DC on the rack you can
>connect right up, no power supplies required at all.
>
>The TNT can support more T1 ports for Frame Relay - 150 (15 FrameLine
>Modules). Even with a 12 port card the most a PM-4 can do is 108. The
>problem isn't data - it is physical space. 12 T1 ports will pretty much
>fill the media card edge to edge. To do more they'd have to create a
>custom connector and some kind of fan out cable. I don't know that that
>is worth the trouble. Also the PM-4 ports aren't Frame Relay only - it
>is more like the 8 port channelized T1 cards for the MAX - FR, ISDN,
>leased line PPP, etc.
>
>-MZ
>--
><URL:mailto:megazone@megazone.org> Gweep, Discordian, Author, Engineer,
me..
>Join ISP/C Internet Service Providers' Consortium
<URL:http://www.ispc.org/>
>"A little nonsense now and then, is relished by the wisest men"
781-788-0130
><URL:http://www.megazone.org/> <URL:http://www.gweep.net/> Hail
Discordia!
> ====================================================================
> ISPF, The Forum for ISPs by ISPs. October 26-28, 1998, Atlanta, GA.
> Three days of clues, news, and views from the industry's best and
> brightest. http://www.ispf.com/ for information and registration.
> ====================================================================
>++ Ascend Users Mailing List ++
>To unsubscribe: send unsubscribe to ascend-users-request@bungi.com
>To get FAQ'd: <http://www.nealis.net/ascend/faq>
>
++ Ascend Users Mailing List ++
To unsubscribe: send unsubscribe to ascend-users-request@bungi.com
To get FAQ'd: <http://www.nealis.net/ascend/faq>