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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 19/70頁 |
| 文件大?。?/td> | 1007K |
| 代理商： | LXP730LE |
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Multi-Rate DSL Framer
—
LXP730
Datasheet
19
2.8
MDSL Interface
Each LXP730 device works directly with one SK70725/21 data pump chip set. The SK70725/21
chip set must be in Mode 0 to work with the LXP730. Refer to the SK70725/21 data sheet for
details.
The LXP730 provides TDATA to the data pump and accepts QUATCLK, BITCLK and RDATA
signals from the data pump. The framer supports line data rates from 272 kbps to 1168 kbps.
Table
2
shows some of the common even-numbered transport, nominal line rates and the number of bits
per frame. Odd numbered N values may also be used.
The first value in the Bits/Frame column is the number of bits in an unstuffed frame, and the
second value is with stuffing. MDSL Frame periods are a nominal 6 ms regardless of the nominal
line rate.
The line rate is calculated as
N
x 64 kbps + 16 kbps, where
N
is the number of 64 kbps channels to
be transported. The 16 kbps is the total overhead provided by the MDSL transport system.
The 16 kbps holds true as long there is one Z bit per block as described in
“
MDSL Frame Format
”
on page 25
. The LXP730 supports up to eight Z bits per block, but when greater than one, the
overhead rate increases. This causes the line rate to increase accordingly. The equation to calculate
the DSL line rate is as follows:
Line rate (kbps) = 8[Z + 1 + (N x 8)]
The LXP730 will scramble payload data, but pass the sync word in the clear. In the Local mode, the
LXP730 uses the following scrambling polynomial:
x
-23
+ x
-5
+ 1,
In the Remote mode the scrambling polynomial is:
x
-23
+ x
-18
+ 1.
In transparent mode, the LXP730 uses the quat alignment signal (QUATCLK) from the data pump
to align the sign and magnitude bits in both the transmit and receive directions.
The overhead bits are described in
“
MDSL Overhead Definition
”
on page 23
.
Before routing the data to the descrambler, the LXP730 will invert the sign bits of the received data
stream, if the detected frame sync word has inverted sign bits.
Table 2. Common Transport & Line Rates
Data Rate
(kbps)
Nominal Line
Rate (kbps)
64 kbps Channels
(N)
Bits/Frame
256
272
4
1630/1634
384
400
6
2398/2402
512
528
8
3166/3170
640
656
10
3934/3938
768
784
12
4702/4706
1152
1168
18
7006/7010
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