Cisco3845: NM-1T3/E3 vs NM-1A-T3/E3

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Jul 3rd, 2009
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What's the difference between these two T3/E3 network modules (NM-1T3/E3 and NM-1A-T3/E3)? It seems that both modules provide T3/E3 connectivity.


Read that the cable is using the 75-ohm BNC connectors for both modules. Is the part code "CAB-ATM-DS3/E3" the correct cable to install for both modules?


NM-1T3/E3 >>>>>

http://www.cisco.com/en/US/prod/collateral/modules/ps2797/ps4909/product_data_sheet09186a008010fba2.html


NM-1A-T3/E3 >>>>>

http://www.cisco.com/en/US/prod/collateral/modules/ps2797/ps8604/product_data_sheet0900aecd806a2d17.html

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paolo bevilacqua Fri, 07/03/2009 - 09:52
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The -1A is for ATM only and cannot use for clear channel or frame-relay.

Vice-versa for the other module.

Cable is the same.


tanhongbak Fri, 07/03/2009 - 14:48
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I was informed that the connectivity will be a 45Mbps IPLC between 2 sites. What will be the difference in provisioning in Clear channel mode or in ATM? since both achieve 45Mbps T3 speed.

paolo bevilacqua Sat, 07/04/2009 - 02:06
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What is IPLC ? You should use the clear channel however because with ATM you always suffer a large overhead.

tanhongbak Sat, 07/04/2009 - 05:03
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An IPLC (International Private Leased Circuit) is a point-to-point private line used by an organization to communicate between offices that are geographically dispersed throughout the world. An IPLC can be used for Internet access, business data exchange, video conferencing, and any other form of telecommunication.

paolo bevilacqua Sat, 07/04/2009 - 05:26
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Very good. Use the non ATM module for that, and remember to rate useful posts with the scrollbox below.

Marcus Ramirez Wed, 11/03/2010 - 11:41
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Thank you for the information about these cards. I have been trying to research the big difference between the two for quite some time now. I couldn't find the link on the NM-1T3/E3 module but you were able to! Thanks again for the help! Great information!

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