Datum Systems PSM-500L Especificaciones descargar pdf (Pagina 123)

PSM-500/500L/500LT SCPC Satellite Modem Maintenance

PSM-500/500L/500LT - Rev. 0.91

Page 4-21

toward the line side. However, because of the hard wiring of the interface the pinout is fixed as a

DCE device. See Maintenance Section 4.1.2 for information on using the built-in BERT.

Why doesn’t my 1:1 redundant switch on certain alarms?

The 1:1 redundancy logic is programmable on two levels. First is the <Unit: Redundcy – SW

Rqst> parameter which selects whether a switch is requested on all alarms, alarm A and/or

alarm B. If it is set to any options but “On All Alarms” then the particular alarms that are summed

into the A and B alarms are themselves programmable, creating the second level. See the

discussion in section for more information.

E. Manual

What do the abbreviations on the front panel and in the manual mean?

A good example is the display and manual representation "Redundcy SW Rqst". Unfortunately

the display does not hold enough characters to display the full text of "Redundancy Switch

Request". Following is a list of abbreviations used.

Abbreviation

Full Text

1:1, 1:N, M:N One for One, One for N and M for N. All

redundancy switch types.

ACR

Automatic Configuration Recovery

AFC

Automatic Frequency Control

AGC

Automatic Gain Control

ALC

Automatic Level Control

Alm

Alarm

Alt

Alternate

AUPC

Automatic Uplink Power Control

AUFC

Automatic Uplink Frequency Control

BER, BERT

Bit Error Rate, Bit Error Rate Test

BUC

Block Up-Converter

Cal

Calibrate

Clk

Clock

Config

Configuration

Cntst

Contrast

CXR

Carrier

Dem

Demodulator

Dif

Differential

ESC

Engineering Service Channel

Erred

Errored

FEC

Forward Error Correction

Freq, Frq

Frequency

Frmt

Format

HSSI

High Speed Serial Interface (used with routers)

IDcOff, QDcOff

I and Q channel DC Offset

I/O

Input/Output

Int'f

Interface

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