Date: Tue, 15 Oct 1996 09:46:23 -0400 From: kri@bellcore.com (Padma Krishnaswamy) To: nanog@merit.edu, salo@msc.edu (Tim Salo) Subject: Re: Cisco's AIP vs HSSI
One other point about the AIPs relative to the HSSI/DSU ; you may not be interested in this feature , but the AIPs implement traffic shaping- ie You can set Peak and Average rates and burst size; you could use this to subrate your traffic -should you be in a situation where this is desirable.
That is my understanding. I think that this is part of a some more general observations: o The AIP card is a more intelligent card and can perform more functions today and is much more likely to perform more functions in the future. o I suspect that few, if any, new ATM features will be added to the HSSI card. Again, your router vendor should be telling you all of this.
I havent looked around to check out any new ADSU type products since mid 95, but it used to be that you could not do this with an ADSU.
This is also my understanding. I thought I saw some work being done on an enhanced DXI specification, (the interface between the router and the ATM DSU), but I think that, for the most part, not much work is being done with ATM DSU solutions today. ATM DSUs were largely developed as a quick-to-market solution for adding ATM functionality to routers, without the need for new router boards. Their time has passed. -tjs
This is also my understanding. I thought I saw some work being done on an enhanced DXI specification, (the interface between the router and the ATM DSU), but I think that, for the most part, not much work is being done with ATM DSU solutions today. ATM DSUs were largely developed as a quick-to-market solution for adding ATM functionality to routers, without the need for new router boards. Their time has passed.
-tjs
I don't think that HSSI was designed as a point solution until ATM came along. Couching your answers in the context of an ATM solution is presumption, or so it appears to me. -- --bill
This is also my understanding. I thought I saw some work being done on an enhanced DXI specification, (the interface between the router and the ATM DSU), but I think that, for the most part, not much work is being done with ATM DSU solutions today. ATM DSUs were largely developed as a quick-to-market solution for adding ATM functionality to routers, without the need for new router boards. Their time has passed.
-tjs
I don't think that HSSI was designed as a point solution until ATM came along. Couching your answers in the context of an ATM solution is presumption, or so it appears to me.
-- --bill
Are you talking about point-to-point ATM or just point-to-point applications in general? My wild-assed guess would be that about 45% of HSSI boards are running point-to-point HDLC or PPP and 45% are running Frame, with the rest SMDS and ATM and god knows what else. Avi
I don't think that HSSI was designed as a point solution until ATM came along. Couching your answers in the context of an ATM solution is presumption, or so it appears to me.
-- --bill
Are you talking about point-to-point ATM or just point-to-point applications in general?
My wild-assed guess would be that about 45% of HSSI boards are running point-to-point HDLC or PPP and 45% are running Frame, with the rest SMDS and ATM and god knows what else.
Avi
The orginal question can be paraphrased as; "which board is better" (see the subject line). Tim S. couched his replies in the form of an ATM only solution. I feel that the HSSI board was not designed as such. Your comments seem to back up my assertions. I would claim that for raw throughput, and assuming the DS3 daughtercard for the AIP, that the HSSI board delivers more useful bits at the expense of an outboard CSU. This is based on my feeling that HDLC is more efficent than ATM signaling/framing. -- --bill
The orginal question can be paraphrased as; "which board is better" (see the subject line). Tim S. couched his replies in the form of an ATM only solution. I feel that the HSSI board was not designed as such. Your comments seem to back up my assertions. I would claim that for raw throughput, and assuming the DS3 daughtercard for the AIP, that the HSSI board delivers more useful bits at the expense of an outboard CSU. This is based on my feeling that HDLC is more efficent than ATM signaling/framing.
Agreed... But it's not a feeling, it's a fact :)
--bill
Avi
Hello, Below.....
This is also my understanding. I thought I saw some work being done on an enhanced DXI specification, (the interface between the router and the ATM DSU), but I think that, for the most part, not much work is being done with ATM DSU solutions today. ATM DSUs were largely developed as a quick-to-market solution for adding ATM functionality to routers, without the need for new router boards. Their time has passed.
-tjs
I don't think that HSSI was designed as a point solution until ATM came along. Couching your answers in the context of an ATM solution is presumption, or so it appears to me.
Agreed. On a side note, the HSSI card does not terminate in a V.35, but rather in a HSSI physical connection, similar to a SCSI physical termination. I wouldn't ponder the intent of the designers of the HSSI card. However, I would hazard that a good percentage (3-15) of the HSSI cards are used for access points to iMUXes.... -alan
participants (4)
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alan＠mindvision.com -
Avi Freedman -
bmanning＠ISI.EDU -
salo＠msc.edu