Giuseppe Larosa Wed, 05/12/2010 - 04:46

Hello Omid,

a C3845 supports 4 HWIC modules,

each HWIC module supports 4 WIC or VIC or VWIC

each VWIC supports 2 E1

also if you want to use the E1 for voice the limit is given by DSP resources in PVDM2 in order to support B channels of each E1 PRI

this can result in a lower limit for Voice E1

Hope to help


Omid Almasieh Wed, 05/12/2010 - 12:51

Hi giuslar ,

tnx for reply ,I have one Cisco 3845 router with 4 NM-2ce1t1-pri modules installed in it(8 E1s),but now i need more E1 ,so i wanna add some new HWIC E1 interface cards,but im not sure that 3845 can support more than 8 E1 or not ?

Warm regards,


Omid Almasieh Fri, 05/14/2010 - 12:03

giuslar ,

I wanna use all E1s just for data services,but im not sure they can handle 10 E1!!!!

Giuseppe Larosa Tue, 05/18/2010 - 12:15

Hello Omid,

the question is that network modules like the ones you have already installed are independent they do not require or rely on other modules.

the HWIC may require to install DSPs in PVDMs even if used only for data services.


2 port channelized T1/E1 and  PRI HWIC (data only)

Hope to help


mpak12345 Fri, 06/18/2010 - 01:15

Dear Omid ,

                    I have facing same problem , the case is that I have one router 3845 with NM-2ce1t1-pri. now we have to install new HWIC-2CE1T1-PRI

and change the IOS to 12.24 (20)T but card is not detect what can i do ?

Card is ok because it shows in show inventory. so pls support




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