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參數資料
| 型號： | TRU-600A |
| 廠商： | Vectron International, Inc. |
| 英文描述： | High Performance Timing Recovery Module(高性能定時恢復模塊) |
| 中文描述： | 高性能定時恢復模塊（高性能定時恢復模塊） |
| 文件頁數： | 1/2頁 |
| 文件大小： | 20K |
| 代理商： | TRU-600A |
Application Note
TRU-600A
Code Mark Inversion (CMI) Input Data
Introduction
The TRU-600A is a high performance, timing
recovery module designed to extract a clock signal
from an incoming digital data stream. The device
provides an output clock signal along with a retimed
and regenerated data stream. Through the use of
advanced SAW Filter technology the TRU-600A
provides the timing recovery function with full and
consistent compliance to SONET, SDH and NTT
jitter requirements.
The primary application of the TRU-600A device is
the extraction of a clock signal from an incoming
Non-Return to Zero (NRZ) data stream. This data
type is often utilized in optical telecom transmission.
An example is shown in Figure 1(a). NRZ data is a
1B1B code with one line bit for each associated
binary bit. Although initially designed for NRZ timing
recovery applications, it may be applied for other
data formats.
1
0
1
1
1
0
0
1
0
1
0
1
(d) Clock Out
(CMI Data)
(c) CMI Data
(b) Clock Out
(NRZ Data)
(a) NRZ Data
Binary Digit
CMI Input Data
In addition to NRZ data formats, the TRU-600A
device is also commonly applied for clock extraction
of input CMI data streams. CMI data is a 1B2B data
format with two line bits for each associated binary
bit.
As illustrated in Figure 1(c), a CMI low is represented
by a positive transition in the center of the bit period.
A CMI high is represented by no transition within the
bit period, but with alternating polarity for each bit
period. (A CMI low is transmitted as a 01, while a
CMI high is either 11 or 00).
Because the TRU-600A was originally intended for
NRZ applications, it will interpret an incoming CMI
data stream as a NRZ stream at twice the binary
rate. For this reason, when using the TRU-600A in
CMI applications, the device should be tuned to twice
the binary rate of the CMI data.
For example, a TRU-600A @ 311.040 Mb/s would be
used to recover a clock signal from an input 155.52
Mb/s CMI data stream. Also note for CMI
applications, that the resulting recovered clock will
be twice the binary rate and may require division by
2
.
Vectron Technologies, Incorporated
267 Lowell Road
×
Hudson, NH 03051
×
Tel: (603) 598-0070
×
Fax: (603) 598-0075
e-mail: solutions@vtinh.com
×
http://www.vectron-vti.com
Vectron Technologies, Inc. reserves the right to make changes to the product(s) and/or information contained herein without notice. No liability is
assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.
For Additional Information Please Contact:
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