4461 and 4507R+E SFP options

[johnny_5]

Hi folks, 

Getting a new circuit installed at datacenter (1 Gig fiber MM handoff) and my thoughts were to use the one of the 1Gig ports using a SFP GLD-SX-MMD on the router(4461X).

Connecting to the CORE switch(4507) I had envisioned connecting one of the routers(4461X) 10Gig SFP ports using an SFP-10G-SR-S to one of the 10gig ports on the supervisor module using another 10G-SR-S SFP module.

Can the modules be interchangeable meaning could I use the 10G-SR in the 1Gig SFP router port?  

Can the 2 10Gig interfaces on the router be used, one to connect to the ISP and one to the CORE switch using such modules?

Thanks in advance.

[balaji.bandi]

Optic should be same always boith the side, you can not mix with 10G with 1GB.

[johnny_5]

If the ISP is using a FINISAR SFP on the their edge router can the other end be used to connect to the Cisco GLD-SX-MMD on my equipment?