[shortdesc]
- Expansion module
- T1/E1 x 8
- T-1/E-1
- for Cisco 4451-X
[/shortdesc]
[specifications][/specifications]
The Cisco Fourth-Generation T1/E1 Multiflex Trunk Voice and WAN Network Interface Modules (NIMs) support data and voice applications on the Cisco 4451-X integrated services routers. These cards combine WAN-interface-card (WIC). voice-interface-card (VIC). ISDN Primary Rate Interface (PRI). dial-access integration. and channelized-data (CE1T1) functions to provide unparalleled flexibility. versatility. and investment protection through their many uses. Customers who choose to integrate data and voice in multiple steps preserve their investment in a T1/E1 WAN interface.
The T1/E1 modules contain an onboard Cisco Packet Voice Digital Signal Processor Module 4 (PVDM4) slot. which requires a fourth-generation PVDM4 module. A PVDM4 on the T1/E1 module is necessary for the voice features. The PVDM4 also provides for echo cancellation of up to 128-ms echo-tail length for demanding network conditions.