Can't find an SFP interface on my C3845 router?

[jimmyc_2]

We have a 3845 router, IPBaseM, ver 12.4(15) that seems to accept an SFP (GLC-LH-SM).

It does not show up on a show run, or Sh Ip int brief. 

If I type show tech-support | include sfp, it returns "sfp_transciever_cod 0x2 (1000BaseLX)".

How do I go about configuring it for Ethernet Private Line  access?

Regards,

jc

[jimmyc_2]

Disregard question above, it seems it was tandem, along with the G0/0 RJ45 interface.   Two physicas ports, but one address, G0/0.  All  I needed was to change media-type to SFP.