Types of Firewall • Types of Firewall • Packet filtering • Packet filtering or network layer (Layer 3) firewalls make decisions based on the source and destination addresses and ports in IP packets. This basic form of firewall protection is re...

Loose-tube vs. tight-buffered fibre optic cable • Loose-tube vs. tight-buffered fibre optic cable • There are two styles of fibre optic cable construction: loose tube and tight buffered. Both contain some type of strengthening member, such as ...

Firewire cable • Firewire • The IEEE 1394 standard is a fast, scalable, low-cost digital interface. It was conceived by Apple® Computer and developed within the IEEE 1394 Working Group. It is generally referred to as FireWire™ the Apple tradem...

Attenuators • Attenuators • Attenuators filter strength of fibre optic signal • Attenuators are used with single-mode fibre optic devices and cable to filter the strength of the fibre optic signal. Depending on the type of attenuator attached ...

PAM modes • G.SHDSL devices use two parameters for line configuration: PAM and BASE RATE. While  G.SHDSL Economy and Etherlink II modems only know two PAM modes (16 and 32), Etherlink IV  works with PAM modes from 4 to 128. Although the PAM mo...

LSZH and PVC cables • LSZH and PVC cables • The European market is demanding that cables used in LANs, WANs, etc. meet LSZH specification. The IEC 60332-1 governs the Flame Retardant Grade specifications in reference to LSZH cables. • Reductio...

Category 6 and 6a • Category 6 and 6a Cables • Category 6 • The next level in the cabling hierarchy is Category 6 (CAT6) (ANSI/TIA/EIA-568-B.2-1), which was ratified by the TIA/EIA in June 2002. CAT6 provides higher performance than CAT5e and ...

Power Sum NEXT (PS-NEXT) • Power Sum NEXT (PS-NEXT) • Power Sum NEXT (PS-NEXT) is the sum of the total NEXT power copuled to a wire pair from all other adjacent pairs. NEXT (Near-end crosstalk) is the level of interference that occurs between ...