What is the maximum transmission distance of OLT uplink card?
For the 10GE uplink port:
X2CA + XFP can support 80km, but the another side must support XFP also;
X2CS + SFP+ can support 40km.
For the GE uplink port:
X2CA/SCUN + SFP can support 80km.
XFP, SFP+, SFP are three types of optical module.