ATL Telecom AM2048 User Manual
Page 15
ATL TELECOM USER GUIDE
AM2048A
27
4.10.3.3
Structured Working, CRCs Enabled
FIGURE 4.10.3: STRUCTURED WORKING, CRCS ENABLED
In this case, the CRCs are checked and errored blocks are indicated back across the user
interface by use of the E bits.
This is the least ambiguous mode of operation from a performance monitoring point of view
because each transmission section is covered by its own independent CRC check.
To set up this configuration, go to the “Configuration > User Port” Menu and select
Rx Unframed
( )
Rx Framed
(*)
Rx CRC4
[X]
Tx TSO Transparent
( )
Tx TSO Generate
(*)
Tx CRC4
[X]
In this mode of operation, the test loop activation messages defined in ETS 300 233 are
passed to and from the LT over the V3 interface.
CRC4
CRC4
NTU
ELU
TE
CRC4G
Tx
TS0
Rx
CRC4M
CRC4G
Tx
TS0
Rx
CRC4M
HDSL
CRC6
CRC4G
Tx
TS0
Rx
CRC4M
CRC4G
Tx
TS0
Rx
CRC4M
HDSL
CRC6
ET
T
V3
E
E
E
E
FAW
A
SA4
SA5
SA6
SA7
SA8
FAW
A
SA4
SA5
SA6
SA7
SA8
FAW
A
SA4
SA5
SA6
SA7
SA8
FAW
A
SA4
SA5
SA6
SA7
SA8
4
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ATL TELECOM USER GUIDE
AM2048A
4.10.3.2
Structured Operation
FIGURE 4.10.2: STRUCTURED WORKING, END-TO-END TRANSPARENT CRCS
To set up to monitor structured G.703 data, go to the “Configuration > User Port” Menu
and select
Rx Unframed
( )
Rx Framed
(*)
Rx CRC4
[ ]
Tx TSO Transparent
(*)
Tx TSO Generate
( )
Tx CRC4
[ ]
The incoming structured data may be set to monitor CRC4 errors by enabling the Rx CRC4
checkbox.. However, no E bits are returned at the user interface from the transmission
equipment.
For fractional working where the aggregate line rate is less than 2048kbps, Rx Framed is
selected automatically. When working fractionally, not all of the timeslots are transported from
one end of the link to the other; the G.704 frame is padded out with the programmable ‘Idle’
pattern. This can be set in the “Configuration>User Port” Screen.
CRC4
NTU
ELU
TE
CRC4G
Tx
TS0
Rx
CRC4M
HDSL
CRC6
CRC4G
Tx
TS0
Rx
CRC4M
HDSL
CRC6
ET
T
V3
E
E
FAW
A
SA4
SA5
SA6
SA7
SA8
FAW
A
SA4
SA5
SA6
SA7
SA8
FAW
A
SA4
SA5
SA6
SA7
SA8
FAW
A
SA4
SA5
SA6
SA7
SA8
MON
MON