NOTE: ‘+’ IN THE DIAGRAM BELOW IS AN EXCLUSIVE OR FUNCTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MSB

PLI '+' 0xB6

NUMBER OF BYTES IN THE GFP PAYLOAD

 

 

 

 

 

 

 

 

 

 

SCRAMBLED-NON

 

 

 

 

LSB

PLI '+' 0xAB

 

HEADERCORE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MSB

cHEC '+' 0x31

 

 

 

 

 

 

 

LSB

cHEC '+' 0xE0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MSB

TYPE

PROGRAMMABLE

 

 

 

 

 

 

 

 

 

 

 

 

LSB

TYPE

PROGRAMMABLE

HEADER

 

 

 

 

 

 

 

 

 

 

 

 

 

TYPE

 

 

 

 

MSB

tHEC

 

 

 

 

 

 

 

 

 

 

 

 

LSB

tHEC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DP PROGRAMMABLE

SP PROGRAMMABLE

 

 

ORDER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MSB

eHEC

PROGRAMMABLE

EXTENDED HEADER

TRANSMISSIONOCTET

 

 

 

SPARE

 

 

 

 

 

 

 

 

 

(XSCRAMBLED

 

 

 

DATA

 

 

+ 1)

LSB

eHEC

 

 

 

 

 

43

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAC PAYLOAD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PAYLOADGFP

 

 

 

 

 

 

64-1522 BYTES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MSB

FCS[31:24]

1) 32-BIT CRC POLYNOMIAL

 

 

 

 

 

FCS[23:16]

2) ON PRE-SCRAMBLED DATA

(OPTIONAL)

 

 

 

 

 

 

 

 

 

 

 

FCS[15:8]

3) COVERS THE GFP PAYLOAD DATA ONLY

FCS

LSB

FCS[7:0]

 

 

 

BIT TRANSMISSION ORDER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 11. The GFP frame

In the receive direction the pro- cess is reversed. The byte wide STS signal is received, the HDMP- 3001 locates the frame and TOH/ SOH, interprets the pointer, termi- nates the TOH/SOH and POH, extracts the SPE/VC, and then ex- tracts the LAPS/GFP packets from the SPE/VC payload. The LAPS/ GFP frames are then processed and passed on to an appropriate link layer device via the MII sys- tem interface.

3.9.1Transmit SONET/SDH Process- ing Overview

The Transmit SONET/SDH Pro- cessor provides for the encapsulation of LAPS/GFP pack- ets into the SPE/VC. It then inserts the appropriate POH and TOH/SOH and outputs the final STS signal to a parallel to serial converter. The processor per- forms the following functions:

• Multiplexes LAPS/GFP packets

from the system interface with

Path Overhead (POH) bytes

that it generates to create the

SPE for SONET or VC for SDH.

• Supports the following POH

bytes: Path Trace (J1), Path

BIP-8 (B3), Signal Label (C2),

and Path Status (G1). Other

POH bytes are transmitted as

fixed all zeros.

• Performs AIS and Unequipped

signal insertion.

3.8.2.3GFP Scrambling

Scrambling is performed to pro- tect the SONET/SDH line against malicious users deliberately send- ing packets to cause long run-lengths of ones or zeros or replicating the SONET/SDH fram- ing bytes. In the transmit direction an X43 +1 scrambler scrambles all SPE payload data except core headers. In the re- ceive direction, a self-synchronous X43 +1 descrambler recovers the scrambled data.

3.9 SONET/SDH Processing

The HDMP-3001 performs standard STS-3c/STM-1 processing for both the transmit and receive direc- tions. In the transmit direction, the LAPS/GFP packets are encapsu- lated into the SONET/SDH SPE/ VC. The POH and TOH/SOH are inserted, and the resulting STS sig- nal is transmitted in byte wide format to a parallel to serial converter and then to a fiber optic transceiver.

• TOH/SOH generation,

including:

• Frame bytes, A1A2

• Section Trace, J0

• Section Growth, Z0

• Section BIP-8, B1

• Orderwire, E1, E2

• Section User Channel, F1

• Data Communications

Channel, D1-D12

24

Page 24
Image 24
Agilent Technologies HDMP-3001 manual GFP Scrambling, SONET/SDH Processing

HDMP-3001 specifications

Agilent Technologies, a prominent name in electronics and measurement technology, offers a wide range of products that cater to various industries. Among its notable offerings is the HDMP-3001, a high-speed, serial data transceiver designed to facilitate robust communications in electronic systems. The HDMP-3001 stands out with its ability to handle high bandwidths, making it particularly suited for applications requiring rapid data transfer, such as telecommunications, computer networking, and high-performance computing.

One of the main features of the HDMP-3001 is its advanced signaling technology. By employing differential signaling, the transceiver minimizes electromagnetic interference and enhances signal integrity. This is crucial in environments with multiple electronic devices operating simultaneously, as it ensures data is transmitted clearly and without degradation.

The HDMP-3001 operates at a maximum data rate of 1 Gbps, allowing for efficient data transfer over short distances. This capability is coupled with a flexible architecture that enables users to configure the transceiver for various applications. The device supports both point-to-point and point-to-multipoint configurations, giving engineers the versatility they need in designing communication links.

Moreover, the HDMP-3001 features on-chip clock recovery functionality, which simplifies system design by reducing the number of external components needed. This built-in feature allows the transceiver to maintain synchronization even as data rates increase, further enhancing performance.

The low power consumption characteristic of the HDMP-3001 is another notable advantage. This makes it an attractive choice for battery-operated devices and systems where power efficiency is critical. The transceiver’s design ensures optimal performance while minimizing heat generation and power draw, enabling longer operational lifetimes.

In terms of physical characteristics, the HDMP-3001 comes in a compact, surface-mount package, allowing for easier integration into various circuit board designs. The small form factor, combined with its innovative technology, makes it a popular choice among engineers seeking to improve data transmission reliability without compromising on space or power constraints.

Overall, Agilent Technologies' HDMP-3001 is a formidable solution for high-speed serial data transmission, characterized by its robust performance, low power consumption, and versatile configuration options. With these features, it continues to be an essential component in the evolving landscape of electronic communications.