IBM ADSL Bridge/ Router Heritage User Manual page 164

Heritage Series ADSL Bridge/ Router
Appendix
A-15
An RJ-11 wall jack usually has four pins; an RJ-45 wall jack usually
has eight pins.
WAN
Wide Area Network - A network that consists of nodes connected by
long-distance transmission media, such as telephone lines. WANs can
span a state, a country, or even the world.