MDS TransNET 900 Guía para resolver problemas descargar pdf (Pagina 6)

GE MDS, LLC

175 Science Parkway

Rochester, NY 14620

MDS TransNET Quick Start Guide General Business: +1 585 242-9600

05-4481A01, Rev. A FAX: +1 585 242-9620

July 2009 Web: www.GEmds.com

4.3 Troubleshooting Chart

Table 8 provides suggestions for resolving system difficulties that

may be experienced in the radio system. If problems persist,

contact the factory for further assistance.

4.4 Technical Assistance

Factory technical assistance is available by contacting GE MDS

during business hours (8:30 AM to 6:00 PM Eastern Time). Use

one of the following means to contact the factory:

Telephone: (585) 241-5510

E-mail: [email protected]

Web: www.GEmds.com

FAX: (585) 242-8369

Part 15 Notice

This Equipment has been tested and found to comply with the

limits for a Class A digital device, pursuant to Part 15 of the FCC

Rules. These limits are designed to provide reasonable protection

against harmful interference when the equipment is operated in a

commercial environment. This equipment generates, uses, and

can radiate radio frequency energy and, if not installed and used in

accordance with the instruction manual, may cause harmful

interference to radio communications. Operation of this equipment

in a residential area is likely to cause harmful interference in which

case users will be required to correct the interference at their own

expense.

This device complies with Part 15 of the FCC Rules. Operation is

subject to the following two conditions: (1) this device may not

cause harmful interference, and (2) this device must accept any

interference received; including interference that may cause

undesired operation.

Warning: Changes or modifications not expressly approved by the

manufacturer could void the user’s authority to operate the

equipment.

Table 8: Troubleshooting Guide

Difficulty Recommended System Checks

Unit is

inoperative

a.Check for the proper supply voltage at the power

connector.

b.The transceiver’s internal fuse may have opened.

Interference is

suspected

a.Verify that the system has a unique network ad-

dress. Nearby systems with the same address

will cause interference.

b.Check for interference by locking out affected

zone(s) using the SKIP command.

c.If omnidirectional antennas are used on Remote

stations, consider changing to directional anten-

nas. This will often limit interference to and from

other stations.

No synchroniza-

tion with Master,

or poor overall

performance

a.Check for secure interface connections at the ra-

dio and the connected device.

b.Check the antenna, feedline and connectors. Re-

flected power should be less than 10% of the for-

ward power reading (SWR ≈ 2:1 or lower).

c.If the Remote radio is in synchronization, but per-

formance is poor, check the received signal

strength using the RSSI command. If RSSI is

low, it may indicate antenna problems, or mis-

alignment of directional antenna headings.

d.Verify proper programming of system parame-

ters: mode, network address, data interface baud

rate, transmitter power, CTS delay, etc. For

store-and-forward applications, also verify the

following: SAF is ON; extended address is prop-

erly programmed at each extension; Remotes

are using the proper values for XPRI and XMAP.

e.Check for alarms using the STAT command.

BER is too high.

Data throughput

is spotty

a.The RETRY and REPEAT commands may be in-

creased to deal with interference, or decreased

to increase throughput and reduce latency.

b.Try turning on FEC. FEC on gives some coding

gain, but comes at the cost of reduced through-

put.

Latency is too

high

a.Reduce the REPEAT count.

b.Turn BUFF OFF. BUFF ON ensures that no gaps

occur in the data, but this comes at the cost of in-

creased latency.

c.Make sure HOPTIME is set to 7.

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