ISDN Interfaces

The following interfaces on a device are available for ISDN connectivity:

For ISDN BRI, up to six of the following field-replaceable units (FRUs):
- 4-port S/T PIM supporting ITU-T I.430, ETSI TS 101080, and GR-1089-Core Type III
- 4-port U PIM supporting ANSI T.601 and GR-1089-Core
For ISDN PRI, up to six Dual-Port Channelized T1/E1/ISDN PRI PIMs, supporting ITU-T Q.920, Q.921: LAPD, Q.930, and Q.931