PSTN is the Public Switched Telephone Network, the system
based on circuit-switched technology for real time voice
transmissions.
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PABX
The term PABX refers to a Private Automated Branch Exchange.
It is a business telephone network where calls are digitally routed within
the organization.
VoIP Equipment | IP Telephony Information
With VoIP telephones, adapters and equipment, low-cost phone calls are transmitted digitally over computer networks.
Standby UPS
Learn about Standby UPS units for consumer or professional device and data protection. Battery-powered devices can detect an outage and supply electricity.
On-line UPS
Look at Online UPS solutions with zero transfer times. These uninterruptible power sources deliver backup power for device protection.
Line Interactive UPS
A Line Interactive UPS powers equipment during the brownout or blackout, without battery drainage. Understand uninterruptible power sources that correct high voltage.
What are the different types of UPS?
UPS devices deliver critical equipment protection. Uninterruptible Power Supplies offer a full range of power management solutions.
VA
Learn about Volt-Ampere (VA) ratings on Uninterruptible Power Supply (UPS) units to prevent overloads.
D-Link Switches, Mini Adapters, IP Surveillance
Get an overview of D-Link, including product information about D-Link switches, IP surveillance products, and D-Link mini adapters.
Cisco StackWise
Catalyst Switch Stacks can be created using Cisco StackWise. Multiple switches become a logical switching stack with the technologies.