08-28-2002 03:20 PM - edited 03-02-2019 12:59 AM
We will be upgrading our ISP connection to T3 soon. I would like to use the NM-1A-T3 module on our 3620. I feel I have good experience with all sorts of T1 setups but never tried T3/ATM. How difficult with this be? Any good texts or how-to's out there? How much help can I expect from the ISP? Would it be easier to go with the HSSI NM and an external T3 CSU/DSU?
Thanks,
Diego
08-29-2002 08:58 AM
It really depends on your ISP. If the DS-3 the ISP offers is ATM, you need ATM on your side. If your ISP is offering a TDM DS-3, the HSSI module is what you need.
The config is strait forward for ATM if you need it, but I would be inclined to believe the ISP will offer TDM, in which case the ATM module will not work.
Doug
08-29-2002 12:09 PM
Is TDM synonymous with channelized? Would this mean that I would have to setup 28 T1s and bond them somehow? Does Cisco offer a DS3 TDM module for the 3600 platform?
Thanks,
Diego
08-30-2002 07:02 AM
Is TDM synonymous with channelized? No. I was using that to differentiate "Classic" DS-3 from ATM DS-3.
The point was that ATM DS3 is a fundamentally different approach, uses different hardware and is incompatible at the router module level with PPP/Frame Relay/Etc. framed DS-3/Fractional DS-3.
A HSSI card is one serial stream that the T-3 DSU maps into multiple channels on an "unchannelized" DS-3 circuit.
There are 2 modules for the 3600
HSSI (Requires external DS-3 CSU/DSU)
ATM DS-3
There is no Channelized module for the 3600 to my knowledge.
The 7200 and 7500 do support a channelized DS-3 module.
However, its job is to aggregate multiple sites running t-1 into one router, not a point to point scenario, such as you are describing.
Hope this helps;
Doug
08-30-2002 09:59 AM
It helped a great deal.
Thank you very much,
Diego
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