CT-N328

CorNet ARCNET Adapter Micro PC Industrial Temperature Fiber ST 820 nm QNX 4

All Corman Technologies' networking products are engineered for reliability and are easy to install, use and manage. Some of these features include:

Compatible with QNX 4 Two ST Connectors (RX & TX) Cabling 62.5/125um or 100/140um multimode Link budget 9.9dB with 62.5um or 15.4dB with 100um +5VDC@0.5A max. Operating: -40C to 75C, 0% to 95% (non-condensing) Where secure and robust communications are needed, ARCNET is a proven solution. Well suited for real-time control applications, ARCNET eliminates transmission collision on bust networks. Why CorNet Adapters?

• Fully compatible with QNX 4, most support QNX 2
• Menu selectable node id, timeouts and interrupt level
• Specialized adapters including Coax, Twisted Pair, Fiber Optics (both commercial and industrial temperature)
• Individually tested to meet network signal requirements
• Elevated temperature burn-in for maximum reliability and operation in harsh environments

Consider Fiber Optics With fiber optics, you combine the reliability of ARCNET with the noise immunity and security of optical fiber. These are especially suited if your network is in a harsh environment or you need to span large distances. Fiber optic cabling is not affected by electromagnetic interference, short circuits, grounding problems, or static discharges. Point-to-point distances of 8000 feet (2.5 kilometres) are typical. Maximum distances depend on the fiber optic cable type. Networks using only fiber optic cabling may use extended time-outs to span distances greater than 30 km

ARCNET Specifications:

• Modified Token Passing Local Area Network
• 2.5 Megabaud transmission
• Supports up to 255 nodes
• Coax cable lengths up to 2000 ft (600m)
• Twisted pair cable lengths up to 400 ft (120m)
• Fiber cable lengths typically up to 8000 ft (2.5 km)

Before any CorNet product leaves our factory, we run it through an intensive burn-in procedure which isolates marginal components which other manufacturers'inspections often miss.

During our burn-in the adapters and hubs are turned on and connected to an operational LAN running diagnostic software. Then we raise the ambient temperature abnormally high for computer equipment (43C or 110F), creating even higher temperatures at the surface of the printed circuit board.

Our workmanship and quality control are second to none. If you're looking for reasonably priced ARCNET hubs and adapters for a harsh environment or just want the confidence of high reliability hubs and adapters for your office, the CorNet ARCNET products are for you.

DESCRIPTION

This is an ARCNET fiber optic adapter for QNX 4 networks. The CorNet ARCNET Adapters - Industrial Temperature Fiber Optic offer high resistance to radio frequency interference. This is due to glass fiber being used as the medium to transmit the data packets across the network. Since glass is an insulator rather than a conductor of electric current, this medium cannot be affected by "noise" from other electrical sources, such as motors, radio transmitters, or lightning. With fiber optics, light is the source of energy that permits this transmission of data. These adapters are designed to function in industrial temperature ranges. This extended temperature range allows these adapters to be used in harsher environments than standard ARCNET adapters.

OPERATING ENVIRONMENT

Operating Temperature:
0 to +55C

Storage Temperature:
-55 to +150C

Humidity:
0% to 95% (non-condensing)

Arcnet LAN INTERFACE

• Two ST connectors
• 820nm to 850nm
• 2.5 Megabaud transmission
• Software reset capability
• 2K dual port buffer for high speed interleaved message transfer
• Not affected by radio frequency and electro-magnetic interference, or grounding problems
• Secure - no eavesdropping or data link taps
• Software selectable extended timeouts
• Optical Power Budget:

PHYSICAL SPECIFICATIONS

Short length 8 Bit PC Card

Switch selectable memory map base address

Switch selectable node ID and interrupt level

LED indicators: Green - indicates network is operating normally. Red - indicates node activity

INSTALLATION CONSIDERATIONS

Fiber Optic Cable Type:
Dual Fiber
Graded Index (Multi-Mode)
62.5/125um or 100/140um
ST connectors

Cable specifications include a standard connector loss for both ends of a single cable. It is recommended to allow 2dB of loss to allow for dirt and cracks in the connectors for any given link. Each fusion splice typically adds 0.25 dB loss, and barrel connector splices are the sum of the barrel connector and two end connector losses. All these factors result in loss along the line and must be considered

Maximum Distance per Segment: A segment is the cable between two hubs or a hub and a card on the network. The maximum length of a segment of fiber optic cable is dependent on the quality, size, connectors, splices and rating of the fiber optic cable. The most important fiber optic cable specification is the attenuation per kilometer. In combination with the link budget shown previously, the maximum segment length can be calculated.

For example, consider a fiber optic cable with the following specifications:

• 62.5/125um
• Maximum attenuation 3.0 dB/Km
• No splices in entire cable length
• ST connectors on both ends
• Grade F, OFNR (UL Listed Riser)
• 850 nm

From the Optical Power Budget chart the minimum Link Budget is 9.9 dB. Allowing the recommended 2 dB margins, the maximum segment length is then:

Max. Segment Length
= (Link budget - connector & splice losses - 2 dB)
------------------------------------------------
Attenuation
= (9.9 dB - 0 - 2 dB)
------------------------------------------------
3.0 dB/km
= 2.6 km [1.6 miles]

Maximum Network Span:
The maximum span defines the longest signal path length between any two nodes in the network. This determines the maximum end to end propagation delay. ARCNET controller chips have several internal timers based on the maximum propagation delay for a particular timeout level. A signal is allowed to pass through up to ten hub delays plus 2000ft [609m] of a coax cable at each segment to determine the standard propagation delay times. This becomes 22,000ft. [6705m] for a coax network. Since the velocity of propagation is lower in fiber optic cable, the network span is reduced. The maximum span for a network connected entirely with fiber optic cable using standard time-outs is approximately 18,500 ft. [5600 meters].

Before any unit can leave the factory, an intensive elevated temperature burn-in procedure is performed. During burn-in, the units are not only powered on but also connected to an operational LAN running diagnostic software. The ambient temperature in the burn-in chamber is raised to an abnormally high temperature for computer equipment creating even higher temperatures at the PCB surface of the unit itself. Our workmanship and quality control is focused on the goal of customer satisfaction.

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