Can lease line connected to ethernet port if there is no E1/T1 card?

[Herman2018]

we have one cisco router 4k without E1/T1 card. Now want to subscribe a lease line 128kb which the service provider said it need a serial interface on the router? Can we use a normal ethernet port g0/0/0 to connect this lease line? Can anyone please advise, thanks in advance? 

[marce1000 · Accepted solution]

                      >...Can we use a normal ethernet port g0/0/0 to connect this lease line? 
                    - No , if it's a serial line then you need a port which can do serial communications , 

 M.

[Richard Burts · Accepted solution]

I agree with @marce1000 that you can NOT connect a serial cable to an Ethernet interface. While the physical interface may look like it would fit, the protocols used for serial communication are VERY different from the protocols used for Ethernet.

[Herman2018]

Thanks @marce1000 @Richard Burts  for your kind advice!

[Richard Burts]

I am glad that our suggestions have been helpful. Thank you for marking this question as solved. This will help other participants in the community to identify discussions which have helpful information. This community is an excellent place to ask questions and to learn about networking. I hope to see you continue to be active in the community.

[johnlloyd_13]

hi,

you'll need to clarify with your service provider what's their handoff/interface to your 4K router.

there's E1 (mostly in UK, Middle East and Asia) and T1 (US) which looks like an RJ45 cable but with pins terminated differently and "smart serial" which is a flat connector and connects to a CSU/DSU blue cable.

i'm surprised E1/T1 still exist as these are legacy in some countries/service providers (maybe used in remote ares?). is this for a voice/SIP service?