Just got the new Eircom F1000 router at home today as part of eFibre rollout and to my surprise nothing was left about the router or how to config.
Anyway, previous comments are right, there appears to be no manual from Eircom (yet). It seems to me that the ZyXEL F1000 is a custom job on the P-2812HNU-Fx Series
http://www.zyxel.com/products_services/p_2812hnu_fx_series.shtml?t=p and the user guide for that router is ROUGHLY the same (Word of warning, after a quick look there are a number of additional tabs available on the F1000 config, many of them are advanced VDSL settings so don't go messing with anything unless you know what you are doing).
Couple of notes:
My router ip was 192.168.1.254
Username: admin
Password: same as Wireless Key on back of router
It automatically prompted me to change the password which was handy.
The router is saying it has a 70 Mbps down, 20 Mbps up DSL connection but so far my best result has been 47.4 Mbps down, and 17.38 Mbps



Would be interested to see others actual speeds with eFibre are.