The MX412 has the following features:

Twelve RJ-48 long-haul T1 connections with outside plant protection
A four-port Ethernet switch
One V.35 port
Four-port terminal server (RS-232)
One FXS port
DB-9 craft port (RS-232)
Non-Blocking DS0 cross connect between all DS1 interfaces and the V.35 port
Manual and remote initiated loopback modes
Telnet management over 10/100 LAN or VT100 via the local RS-232 craft port
Robbed Bit Signaling (RBS) supported on a per DS0 basis
Front panel data connections
Meets NEBS Level 1 requirements
Accepts redundant ±60 to ±22 VDC inputs