參數(shù)資料
型號(hào)： S3035
廠商： Applied Micro Circuits Corp.
英文描述： SONET/SDH/ATM OC-3/12 Transceiver W/CDR(頻率可選，帶片上高頻鎖相環(huán)的SONET/SDH收發(fā)器（完全集成OC-3/12接口器件）)
中文描述： 的SONET / SDH / ATM的OC-3/12收發(fā)瓦/的CDR（頻率可選，帶片上高頻鎖相環(huán)的的SONET / SDH收發(fā)器（完全集成OC-3/12接口器件））
文件頁(yè)數(shù)： 2/22頁(yè)
文件大小： 151K
代理商： S3035
2
S3035
SONET/SDH/ATM OC-3/12 TRANSCEIVER W/CDR
July 25, 2000 / Revision E
SONET OVERVIEW
Synchronous Optical Network (SONET) is a stan-
dard for connecting one fiber system to another at
the optical level. SONET, together with the Synchro-
nous Digital Hierarchy (SDH) administered by the
ITU-T, forms a single international standard for fiber
interconnect between telephone networks of differ-
ent countries. SONET is capable of accommodating
a variety of transmission rates and applications.
The SONET standard is a layered protocol with four
separate layers defined. These are:
Photonic
Section
Line
Path
Figure 2 shows the layers and their functions. Each
of the layers has overhead bandwidth dedicated to
administration and maintenance. The photonic layer
simply handles the conversion from electrical to opti-
cal and back with no overhead. It is responsible for
transmitting the electrical signals in optical form over
the physical media. The section layer handles the
transport of the framed electrical signals across the
optical cable from one end to the next. Key functions
of this layer are framing, scrambling, and error moni-
toring. The line layer is responsible for the reliable
transmission of the path layer information stream
carrying voice, data, and video signals. Its main
functions are synchronization, multiplexing, and reli-
able transport. The path layer is responsible for the
actual transport of services at the appropriate signal-
ing rates.
Data Rates and Signal Hierarchy
Table 1 contains the data rates and signal designa-
tions of the SONET hierarchy. The lowest level is the
basic SONET signal referred to as the synchronous
transport signal level-1 (STS-1). An STS-Nsignal is
made up of Nbyte-interleaved STS-1 signals. The
optical counterpart of each STS-N signal is an opti-
cal carrier level-N signal (OC-N). The S3035 chip
supports OC-3 and OC-12 rates (155.52 and 622.08
Mbit/s).
Frame and Byte Boundary Detection
The SONET/SDH fundamental frame format for
STS-12 consists of 36 transport overhead bytes fol-
lowed by Synchronous Payload Envelope (SPE)
bytes. This pattern of 36 overhead and 1044 SPE bytes
is repeated nine times in each frame. Frame and byte
boundaries are detected using the A1 and A2 bytes
found in the transport overhead. (See Figure 3.)
For more details on SONET operations, refer to the
Bellcore SONET standard document.
Elec.
STS-1
STS-3
STS-12
STS-24
STS-48 STM-16
ITU-T
Optical
OC-1
OC-3
OC-12
OC-24
OC-48 2488.32
Data Rate (Mbit/s)
51.84
155.52
622.08
1244.16
STM-1
STM-4
STM-8
Table 1. SONET Signal Hierarchy
Figure 2. SONET Structure
0 bps
End Equipment
Payload to
SPE mapping
Maintenance,
protection,
switching
Optical
transmission
Scrambling,
framing
Fiber Cable
End Equipment
Section layer
Photonic layer
Line layer
Path layer
Path layer
Section layer
Photonic layer
Line layer
Layer Overhead
(Embedded Ops
Channel)
Functions
576 Kbps
192 Kbps
相關(guān)PDF資料
PDF描述
S3037 SONET/SDH/ATM OC-3/12 Transceiver W/CDR(19.44和77.76 MHz兩種頻率可選的SONET/SDH收發(fā)器)
S3038 SONET/SDH/ATM OC-12 Quad Transceiver(SONET/SDH四收發(fā)器（完全集成OC-12接口器件）)
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S3040B SONET/SDH Clock Recovery Unit(帶片上高頻鎖相環(huán)的SONET/SDH時(shí)鐘恢復(fù)單元)
S3040 OC-48 Clock Recovery Unit(OC-48時(shí)鐘恢復(fù)單元)
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