Cisco 450 Manuale di installazione dell'hardware - Pagina 3

Sfoglia online o scarica il pdf Manuale di installazione dell'hardware per Porta d'ingresso Cisco 450. Cisco 450 37. Voice gateway

Overview of Cisco VG450 Voice Gateway

Cisco High-Density Analog Voice Gateway provide enterprises, managed services providers, and service

providers the ability to directly connect public-switched telephone networks (PSTNs) and existing telephony

equipment to Cisco 4000 Series Integrated Services Routers. These fixed-port (FXS and FXO) modules

provide Dual-Tone Multifrequency (DTMF) detection, voice compression and decompression, call progress

tone generation, Voice Activity Detection (VAD), echo cancellation, and adaptive jitter buffering. Cisco

VG450 Voice Gateway is a high-density analog voice gateway. It is an intermediate path that enables TDM

to IP transition.

The Cisco VG450 Voice Gateway supports the following interfaces:

• Gigabit Ethernet (GE)

• USB

• Network Interface Module (NIM)

• Single-Wide Service Module (SWSM) interface

• Double-Wide Service Module (DWSM) interface

This chapter contains the following sections:

•

Cisco VG450 Voice Gateway provides VoIP connectivity to analog devices, such as analog desk phones,

analog conference room phones, fax machines and modems. Cisco 450 Voice Gateway provides several

improvements from the previous high-density analog and digital extension modules (EVMs), in the following

ways:

• On-board Digital Signal Processor (DSP)—The FXO and FXS service modules contain an onboard

• Support for Online Insertion and Removal (OIR)—The FXS and FXO service modules support Online

Features and Benefits of Cisco VG450 Voice Gateway, on page 1

Slot, Bay, and Ports, on page 4

Cisco VG450 Voice Gateway Chassis, on page 6

Technical and Compliance Specifications, on page 6

Platform and Software Requirements, on page 8

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.

Insertion and Removal (OIR), reducing the downtime required for new or replacement modules. The

C H A P T E R

Cisco 450 Voice Gateway Hardware Installation Guide