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參數(shù)資料
| 型號(hào)： | LXP730LE |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 中文描述： | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 文件頁(yè)數(shù)： | 31/70頁(yè) |
| 文件大?。?/td> | 1007K |
| 代理商： | LXP730LE |
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Multi-Rate DSL Framer
—
LXP730
Datasheet
31
6. Otherwise if DXZ2 = 55h, set B7 to 1 in register WR2 of SK70725 (Address 02, data 80h). Set
bit B0 to 0 in register 24h of LXP730 to stop it and then set this bit back to 1 to re-start. The
framer needs to be restarted to recognize the new sync word. TIP/RING lines are reversed and
corrected for in the SK70725, and the system is ready for transmission.
7. Normal operation.
For BELB (Back End Loop Back) on the NTU side:
8. Send message to NTU side to set the SK70725 in BELB (set bit B6 to 1 in register WR0 of
SK70725 on the NTU side).
9. If the TIP/RING was detected to be straight then set B4 to 1 in register 17h in LTU LXP730
(Address 57h, data 10h) and go to step 11. BELB is completed and the system is ready for
transmission.
10. If the TIP/RING reversal was detected and corrected on the LTU side, then set B7 to 0 in
register WR2 of LTU SK70725. Set B4 to 1 in register 17 in LXP730 (Address 57h, data 10h).
Set bit B0 to 0 in register 24 of LXP730 to stop it and then set this bit back to 1 to re-start.
BELB is completed and the system is ready for transmission.
11. When BELB testing is done, reset B4 to 1 in register 17h in LTU LXP730 and send the
command to NTU to undo BELB. Before NTU shuts off BELB all received payload and
overhead data will be scrambled with the wrong polynomial and the value in DXZ2 will jump.
At the LTU wait until there are two consecutive frames where DXZ2 = 55h or AAh.
12. Go to step 4.
3.1.3
DSL System Loopbacks
Data loopbacks in telecom systems are primarily used for system diagnostics. These tests are
usually either BER (Bit Error Rate), or to determine which part of the system is malfunctioning.
In DSL systems the loopback points are usually controlled by the CO (Central Office) end. Line
cards may have one or more DSL loops, and the processor on the board sets the loopback
operation; typically on command from the central control point in the switching system.
The loopback in the linecard demonstrates that the data can successfully be moved from the input
at the MX section through the DX section to receive side of the payload. Typically this is done
with the data pump Front End Loop Back (FELB). This transmits the data onto the wire pair, but
the receive signal from the wire pair is ignored. Instead, the DSL receiver is fed the signal from the
transmitter via an internal multiplexer.
The framer also has a loop back that ignores data from the data pump. This is useful in isolating the
data pump as the source of a malfunction such as when the line has been hit by lightning.
A back end loopback (BELB) is used to test the wire pair and the remote data pump. Here the
RDATA from the data pump is passed to the framer so it can still receive commands from the CO,
such as to turn off the BELB.
A payload loopback at the remote line card will check out the framer and give a more complete
evaluation of the DSL system.
The CO and the CPE each use a different scrambling polynomial in their transmitted data. Each
side expects to receive a different scrambling setting than the one they transmit. When the framer
is in loopback it knows to switch its receive scrambler to match the transmitter. When the local
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