User`s guide
Table Of Contents
- Contents
- About This Guide
- Introduction
- Installation
- Start-Up
- Configuration
- Displays
- Statistics
- Device Management
- Dial Function
- Firmware Download
- Reports
- Session
- Platform/Network Performance Monitor
- Hard Disk and System Recommendations
- NMS Windows Conventions
- Record and Device Locks
- Cabling Requirements
- Data Input Sheets
- Glossary
- Index
Device Management
7-7
6700-A2-GY31-70
July 1999
Table 7-3. VF Impairments (2 of 2)
VF Impairment Name Description
Near End Echo Expressed in dB, the ratio between the transmit signal and the
receiver near end echo of the signal.
Far End Echo Expressed in dB, the ratio between the transmit signal and the
echo from the far end of the signal.
Far End Delay Expressed in milliseconds, the roundtrip delay of the far end
echo.
Echo Frequency Offset Expressed in Hz, the frequency offset of the far end echo.
Signal Quality A number used to indicate the quality of the signal where:
0 = Excellent
1 = Good
2 = Fair
3 = Poor
4 = No Signal
NOTE: If the signal quality is set to “no signal,” no other
impairments are displayed.
Test
Use Test to access a series of tests that can be performed on the device and line.
Select Test from the Device Management menu bar to display the Test pull-down
menu listing the commands such as Device Test, Digital Test, Local Loopback,
Digital Loopback, Remote Digital Loopback, DTE Loopback, Pattern
(BERT), End To End, Dial Tone, Ring Detect, Abort Selective Test, and Abort
All Tests.
COMSPHERE 2400, 3800 and 3900 Series devices are analog-type devices,
while COMSPHERE 3600 devices are digital-type devices. Available tests differ
depending on the type of device selected.
Test Pull-Down Menu for Analog-Type Devices