McDewey

© 2019 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. Page 6 of 13 Figure 4.
High density analog voice modules for VG450

Cisco High-Density Analog Voice and Fax Service Modules are available in either a single-wide or double-wide form factor, as depicted in Table 1. Table 2. Form factors Model Picture SM-X-8FXS/12FXO ● Single-wide service module

SM-X-16FXS/2FXO ● Single-wide service module

SM-X-24FXS/4FXO ● Single-wide service module

SM-X-72FXS ● Double-wide service module

The new generation of Cisco High-Density Analog Voice and Fax Service Modules improves upon the previous high-density analog and digital extension modules (EVMs). These improvements are highlighted below: ● On-board Digital Signal Processor (DSP): The FXO and FXS service modules contain an onboard DSP and don’t require the router to have a dedicated Packet Voice DSP Module (PVDM) on the motherboard. The DSP on the voice module is necessary for the voice features. It also provides for echo cancellation of up to 128-ms echo-tail length for demanding network conditions.