Adc CRA-C Uživatelský manuál Strana 12
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About the Megabit Modem CRA-C
4 Megabit Modem CRA-C User Manual
Reach, Data Rate, SNR Margin, and Noise Environment
The maximum transmission rate of the Megabit Modem CRA-C is determined
by distance, SNR margin, and the condition of the line (wire gauge, condition
noise environment). Figure 1 shows the relationship between reach and data
rate for a given set of conditions. The plots can be used to determine the
achievable reach at a given data rate, or they may be used to determined the
achievable data rates at a given distance. In all of the cases except the no
noise case, a margin of 6 dB was allocated above the SNR that provides a Bit
Error Rate (BER) of 10
-7
.
These line conditions fall within the range of the plots shown in Figure 1:
•
no noise (0 dB margin)
•
low noise (−140 dBm-Hz Additive White Gaussian Noise (AWGN))
•
24 ISDN lines in the same binder group
•
24 HDSL lines in the same binder group
•
24 ADSL lines in the same binder group
•
10 T1 lines in an adjacent binder group
•
one T1 line in the same binder group
The performance shown is "typical" for PairGain Megabit
Modem CRA products. Due to variations in environment and
test setup, PairGain does not guarantee performance to the
figures shown.
One of the configuration options in the Megabit Modem CRA-C is the
startup margin setting. This setting defaults to 6 dB but may be set from
-3 dB to 9 dB. The modems will attempt to come up at the programmed
margin setting. Setting the margin high allows for a cushion against changing
line conditions and impulse noise. Setting the margin low provides less
protection but allows the modems to come up at a higher data rate (if in the
rate-adaptive modes) or at a longer loop length (if in the fixed data rate mode).
The default setting of 6 dB is recommended and provides an overall BER
better than 10
-10
. Reducing the setting to 0 dB will only provide a BER of
less than 10
-7
and is not recommended.
- Megabit Modem CRA-C 1
- P/N 425-613-150-02 2
- Revision 02 2
- May 1998 2
- FCC NOTICE 3
- DECLARATION OF CONFORMITY 4
- USING THIS MANUAL 5
- Using This Manual 6
- CONTENTS 7
- Contents 8
- ABOUT THE MEGABIT MODEM CRA-C 9
- Rate Adaptation 10
- About the Megabit Modem CRA-C 11
- Figure 1 13
- Table 1 16
- Cables for 16
- Item Description Function 16
- Identify LEDs and Connectors 17
- Front Panel LEDs 18
- LED Mode Description 18
- Table 2 18
- Rear Panel 19
- Connect to the ADSL Line 20
- Connect to the Data Network 21
- CONFIGURE AND VIEW STATUS 25
- Configure and View Status 26
- Figure 8 29
- Configure the System Settings 32
- Configuration 34
- (continued) 35
- Reset the ADSL Transceiver 37
- Configure the Bridge/Router 38
- Configure as a Bridge 39
- Configure as a Router 42
- Configure SNMP 46
- Table 12 47
- SNMP Configuration Options 47
- No. For Option Function 47
- Reset the Ethernet Bridge 48
- View Status 49
- ADSL Transceiver Status 50
- Table 13 52
- Field Meaning 52
- Ethernet Bridge Statistics 56
- Table 15 57
- Bridge Statistics Fields 57
- Field Definition 57
- Static IP routing 53 59
- Management protocols 61 59
- Encapsulation protocols 66 59
- Static IP Routing 61
- Figure 10 62
- Table 18 65
- External Router 65
- Static Route Entry 65
- Parameter Definition 65
- Figure 13 68
- IP Addresses 68
- Management Protocols 69
- MIB and Trap Support 71
- Encapsulation Protocols 74
- TECHNICAL SPECIFICATIONS 75
- Management and Maintenance 76
- Agency Certifications 76
- TECHNICAL ASSISTANCE 77
- Technical Assistance 78
- LIMITED WARRANTY 79
- Limited Warranty 80
- GLOSSARY 81
- Glossary 82
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