10.1.1. Scalable Increase in System Capacity 
OpenScape 4000 supports up to 83 access points linked via IP (AP 3300
IP, AP 3500/3505 IP or AP 3700 IP), in addition to a maximum of 15 directly
linked shelves (AP 3300 or AP 3700).
Thus, the maximum number of digital subscriber line circuits in a
system can be increased to 12000.