Name: 4-Serial Port Module with RS-232 Connectivity
Brand: Cisco
Price: 39.95 USD
Availability: InStock

Cisco 28-2122-02 4-Serial Port Module with RS-232 Connectivity

$39.95

In Stock: 2
Manufacturer: Cisco
Model or Part: 28-2122-02
Condition: Refurbished
Weight: 22.00lb

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Item Condition

New - Sealed or Open Box Condition
Excellent - Almost-New, Missing Original Packaging
Refurbished - Seller Refurbished, Good Condition, Previously Used Item

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Description

Overview

The Cisco 28-2122-02 4-Serial Port Module with RS-232 Connectivity is a robust, plug-in expansion option designed for Cisco routers and switches that require reliable serial communication. This compact module delivers four independent RS-232 ports, enabling seamless integration with legacy equipment, console servers, and industrial devices while maintaining Cisco's reputation for performance and security.

Key Features

Four high-density RS-232 serial ports in a single module
Hot-swappable design for zero-downtime installation
Full compliance with Cisco IOS and IOS-XE software releases
Built-in loopback and diagnostic support for quick troubleshooting
Low power consumption and fan-less operation for silent environments
Secure data transmission with optional encryption support

Technical Specifications

Model/Part Number: 28-2122-02
Connector Type: DB-9 (9-pin) RS-232
Port Speed: 300 bps to 921.6 Kbps (configurable)
Data Format: 8N1 (8 data bits, no parity, 1 stop bit) standard
Voltage Levels: +/-12 V typical RS-232
Operating Temperature: 0°C to 55°C (32°F to 131°F)
Dimensions: 1.5 in (H) x 2.0 in (W) x 0.5 in (D)
Power Requirement: 2.5 W per module

Typical Applications

Connecting legacy network devices such as firewalls, load balancers, and older switches
Console management for remote troubleshooting and configuration
Integration with industrial control systems, PLCs, and SCADA equipment
Serial communication with POS terminals, barcode scanners, and medical devices
Secure data collection in field deployments where Ethernet is not feasible

By adding the Cisco 4-Serial Port Module to your infrastructure, you gain flexible connectivity, reduced cabling complexity, and the confidence of Cisco's proven reliability-all while extending the lifespan of your existing serial-based assets.