CISCO PA-4B-U=
- Part Number: PA-4B-U=
- Category: Modules
- Manufacturer: Cisco Systems, Inc
- Quantity: 7
The PA-4B-U provides up to four U-type BRI interfaces for connecting Cisco 7100 series, Cisco 7200 series, and Cisco 7301 routers to an ISDN WAN through its internal network terminator (NT1) device.