Cisco Network Module: 4x ISDN2 BRI for 2600 3600 3660 3700
Cisco Module 4p ISDN BRI f C2600-3600, 0.023 Gbit/s, all protocols, Cisco upgrade card slot, NT1,BRI,ISDN
Cisco Module 4p ISDN BRI f C2600-3600. Data transfer rate: 0.023 Gbit/s, Data link protocols: all protocols. Slot type: Cisco upgrade card slot, I/O ports: NT1,BRI,ISDN