2

Empowering Intelligent Optical Networks

Product Brief

HUDSON 2.0

Variable Rate Digital Wrapper Framer/Deframer, PM, and FEC Device

Part Number S19203CBI20, Revision 1.3, May 2003

General Description

Operating Frequencies

Digital Wrapper functionality is available on the Hudson without

regard to the actual data rate. The table below shows the supported

frequencies of operation for Digital Wrapper transponder and

SONET/SDH monitoring applications. Note that SONET/SDH moni-

toring is only supported for the OC-192 rate.

Typical Full Duplex Application

In the Full-Duplex configuration, the encode side and decode side of

the Hudson can operate independently as shown below. At the input

to the encode side of the Hudson is a SONET monitor which can

verify the integrity of the SONET data stream prior to wrapping and

FEC. At the output of the decode side, another SONET monitor

exists after decoding and deframing, to verify the integrity of the

wrapper's SONET payload before it exits the Hudson. Wrapper

overhead insertion and extraction, encoding and decoding, and per-

formance monitoring are carried out on the output and input data

streams respectively. The Hudson also contains many features to

help the user with device integration and line testing. The Hudson

high speed I/O is also compatible with the AMCC SONET/SDH

Mapper or Interleaver/Disinterleaver. A typical edge application is

shown below.

Typical Single-line Application

The following figures also illustrate a typical network application for

the Hudson supporting a single data stream with dual redundant

input and output lines. This configuration is useful for core transpon-

der applications where it is desired to correct errors and do perfor-

mance monitoring and output a corrected and FEC encoded data

stream with or without new Optical Channel Overhead (Digital

Wrapper OH) bytes. Data is received from the fiber and passed

through a Clock/Data Recovery device (CDR) and a demultiplexer

device to the Hudson. The Hudson optionally carries out SONET/

SDH monitoring, digital wrapper performance monitoring, error

checking, and overhead data extraction and insertion. Detected

errors and accumulated error counts can be accessed by the user

either through a processor interface, an FPGA interface, or in a

number of cases, from I/O pins. The data stream is then transmitted

out onto the fiber via a high-speed multiplexer and an optics device.

FEC decoding and encoding may be disabled individually.

Mode

Frequency (Data Rate)

Digital

Wrapper

6.25 MHz (100 Mbps) to 693.483

1. Note: G.709 specifies exact rates for the Digital Wrap-

per. At the OTU2 rate, the frequency of the Hudson data

ports is 669.33 MHz. The Hudson can be safely run at

lower rates than specified in G.709 if compatibility to the

standard is not required.

SONET/

SDH Moni-

toring

622.08 MHz (9.95 Gbps) ONLY

Figure 2: Full-Duplex Configuration

Figure 3: Typical Edge Application

Ring with NO

FEC Coding

OTX

DeMUX

(S3092)

MUX

(S3091)

DECODER

ENCODER

MUX

(S3091)

DeMUX

(S3092)

ORX

FEC Coded

Ring

S19203

ORX

OTX

S 19202

/

S 19201

DE C

EN C

FP G

A

U

PR O

C E SSO

R

S3 0 9 2

S3 0 9 1

S 19203

G

A N G

E S

/

IN D U S

O

P T I C S

M

O

DUL E

C

O

N

N

E

C

T

O

R