10Base-T/100Base-TX/E3 Converter
Operating Manual
IOA170-1A 8
January 2006
E3 line interface:
•
loss of signal at the interface input
•
deviation of the recovered clock
•
too high bit error rate (HDB3 code violation) 1x10
-3
and 1x10
-6
in the incoming signal
Ethernet interface:
•
loss of connection
•
packet transmission
•
port configuration after auto-negotiations
Alarm status signal is indicated as follows:
•
appropriate E3 linear interface LED indicator light on: LOS, LOL, ERR, AIS,
•
LED light OFF of Ethernet interface: LNK/ACT
Table 3-2. Failure/damage detection and accompanying actions
Alarm
status
LED
LNK/ACK
LED LOS
LED LOL
LED ERR
Ethernet Interface
Loss of continuation of connection
signal
☼
1)
Loss of signal
Deviation of the recovered clock
Error range > 10
-6
2)
E3 Interface
Error range > 10
-3
– indicator light on
☼
- indicator light off
1)
- blinking indicator light during transmission
2)
- blinking indicator light
3.4 Quality management
Quality management encompasses monitoring of E3 line transmission quality as well as packet
transmission between LAN and WAN ports ensured by the device.
Control over quality between LAN and WAN ports is based on monitoring transmitted
packets and registering errored transmissions. Assessment of transmission quality is a relation
between the number of errored packets and all packets transmitted at a given time.
E3 line quality control is based on recorded events pertaining to quality in transmissions.
The said quality recorded events may serve to evaluate transmission and service quality in
compliance with G.826. The basis for quality evaluation should be the following:
•
Number of errored seconds – ES
•
Number of severe errored seconds– SES
•
Number of errored blocks – EB
•
Errored second ratio to all seconds when the device is available – ESR [%]
•
Severe errored second ratio to all seconds when the device is available – SESR [%]
•
The ratio of errored blocks to the total number of blocks when the device is available – BBER
[%]
