Mainstream Data DVB+ Installationshandbuch - Seite 2

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LAN Settings

The DVB+™ receiver is pre-configured at the factory for a specific carrier and set of data services, often making it

unnecessary to modify the tuner settings. However, when Ethernet data services are used the DVB+™ LAN (local area

network) settings must be configured. These settings can be modified from the LCD/keypad under the menu item "Specify

Settings", then "LAN settings". Once the receiver has a valid IP address it will then be possible to do other configuration

and monitoring from the Web page interface available via the second RJ-45 Ethernet port labeled "AUX". Installers

experiencing problems with LAN setting configuration should contact Mainstream support directly.

Dish Alignment

Before or after the DVB+™ has locked to a carrier the AGC level can be used to optimize the dish alignment. The AGC is

viewed from the Show Tuner Status LCD display screen. AGC level is a relative measure of signal power from the coax.

Higher numbers indicate more power; however, this measurement is made over the entire L-Band making it a good

indicator of how accurately the dish is aligned at the satellite. AGC does not identify the best LNB polarization, or that the

desired carrier is present. It does not ensure that you are on the correct satellite. For these measurements installers

should use a certified spectrum analyzer. AGC values between 970 and 1005 indicate a properly aligned dish. Longer coax

cables will produce lower AGC numbers. AGC values near zero indicate a disconnected LNB (i.e. cable connection broken,

LNB is faulty etc), or lack of DC power.

Once the DVB+™ receiver is locked to a carrier, the Eb/No values located on the LCD screen should be used to further

optimize the dish and LNB polarization. Eb/No is a measure of the signal to noise ratio on the locked carrier with typical

Eb/No values between 4 and 15. Lower values indicating poor reception and will result in data errors. Persistently low

Eb/No values may indicate a misaligned dish, improperly peaked LNB, or an inadequately sized dish. If the problem persists

contact Mainstream Data Customer Support directly.

DVB+™ has been equipped with another feature to assist in dish alignment called Audalign™. This feature can be enabled

from the LCD/keypad under the "Utilities" menu. When enabled, a beeper inside the receiver will emit a tone based upon

carrier lock. A discontinuous tone (turns on/off 3 times a second) indicates the receiver is not locked to a carrier and the

pitch of the tone indicates the AGC values. Higher tones indicate larger AGC values. When the DVB+™ locks to a carrier,

the tone becomes continuous and the pitch of the tone indicates the Eb/No values. Higher tones indicate larger Eb/No

values.

Pinout Diagrams

RS-232 Asynch Serial port (DCE)

Pin Number

Mainstream Data

Troubleshooting & Dish Alignment

Signal Name or Function

DCD Out

Data Out

Data In

N/C

Signal Ground (SG)

N/C

RTS In

CTS Out

N/C

RJ-45 Ethernet ports

Pin Number

Signal Name or Function

TX+

TX-

RX+

RX-

Mainstream Data, Inc.

375 Chipeta Way, Suite B

Salt Lake City, UT 84108

Main: (801) 584-2800

Support: (800) 473-3332