Quick tech specs
  • Generation Multi-flex Trunk Voice/Channelized Data T1/E1 Module
  • T1/E1 x 4
  • for P/N: ISR4321-PM20
  • ISR4351-PM20
  • ISR4461-K9-CAP
  • Expansion module
  • T-1/E-1
  • ISR4331-PM20
  • ISR4431-PM20
  • ISR4461-PM20
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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.
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Cisco Fourth-Generation Multi-flex Trunk Voice/Channelized Data T1/E1 Modul

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