> How can I tell if my DSL router can be used as a repeater? [...]
Find some good documentation for it, and search that?
Search its management web site for an appropriate option? For a
model like the R7000, which does have a repeater mode, its User Manual
says: ADVANCED > Advanced Setup > Router / AP / Bridge Mode.
Many Netgear router models (including my D7000[v1]) don't have such
an option, so I'd be a little amazed if the 7550 did. It's not a
feature that would be of much interest to an ISP.
Of course, this all depends on what "a repeater" means to you.
Almost any router can be configured as a wireless access point (with a
wired connection to the main-router LAN), but fewer can act as a
repeater (with a wireless connection to the main-router LAN).
