Endace Measurement Systems Limited
http://www.endace.com
EDM01.05-12r1 DAG 3.7T Card User Manual
Copyright, all rights reserved.
13
Version 6. 22 September 2005.
3.5 Configuration Options Supported
, continued
Process
The following is the complete list of EXAR line modes.Mode is defined by
the following parameters:
Process Description
Physical line
E1 or T1
Signal attenuation
< -15dB (short haul), < -36dB (long haul) or < -
43dB (extended long haul)
Transmit power
In T1 there a different recommendations for pulse
depending of distance between equipment
(transmitter -> receiver).
Because a user is not usually transmitting traffic,
there is little to be concerned about with Transmit
LBO.
Cabling
There is two options in E1:
•
75ohm unbalanced coaxial cable or,
•
120ohm balanced twisted pair.
In T1 only standard is 100ohm balanced
twisted pair.
Coding
T1 coding is B8ZS which is called HDB3 in E1.
This is not relevant because dagthree can set
coding separately to ami or b8zs/hdb3.
Example
If there is a twisted pair E1 line to be monitored,
the mode 29 can be used, which is the minimum
gain control value (signal attenuated less than
15dB).
If dagthree reports a poor signal, an increase to
amplifying can be tried by setting mode to 25
(long haul/36dB) or even to 27 (extended long
haul/43dB).
A user should try to use lowest possible gain
control value (eg. start with short haul) because if
signal is amplified too much it easily creates
signal errors.
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