MRV Communications EM316E3 manual Theory of Operation, E3 Line Receiver to fiber optic Transmitter

Page 9

Fiber Driver

EM316E3 & EM316E3SF

Theory of Operation

Block diagram of the Modem/Converter is shown below (fig. 1)

E3

B3ZS

Encoder

FI

Receiver

Decoder

Transmitter

 

E3

B3ZS

Decoder

FI Receiver

Transmitter

Encoder

 

 

 

Fig.

1

 

E3 Line Receiver to fiber optic Transmitter:

The receiver Line Interface Unit (LIU) receives the E3 signal and performs clock recovery and data detection. The data goes through B3ZS Decoding Block to extract NRZ data. It then goes to an encoding block and is ready to be transmitted by the Fiber Optic Transmitter Interface.

Fiber optic Receiver to E3 Transmitter:

The fiber optic Receiver Interface directs the received signal to a decoder in order to extract the NRZ data. The NRZ data is going through B3ZS encoder and then to the E3 Transmitter.

Loop Back:

This feature isolates the optic side from the E3 side, and enables each side to loop back on its own media line as shown below:

Switch LPBK/NORM is set to ON

Loopback On Fiber side

Fiber to far

EM316E3

Coax to

Loopback

near DTE

On E3 side

 

 

Fig. 2

When switch LPBK/NORMAL is turned ON, the card is configured as follows:

Optic input to the receiver is looped back into optic transmitter, thus enabling remote site to perform loop back on fiber optics. Note that this loop back includes the encoder and decoder blocks of the fiber optic. E3 receiver input is looped back into E3 transmitter, thus enabling full loop back on E3 line side. The route of the loop back includes the logic of decoder and encoder blocks of the E3.

P/N: 1226006-001, REV_L

PAGE 9

Image 9
Contents EM316E3SF Registration Card How many employees work at installation site?Serial number What network medium/media does your organization use ?EM316E3SF Fiber Driver EM316E3 & EM316E3SF Product Description IntroductionFeatures Requirements for Managed ModuleConnectivity Display Information LED Definition Typical ApplicationsFiber Optic Jumper Settings Factory Default ConfigurationE3 Line Receiver to fiber optic Transmitter Theory of OperationSwitch LPBK/NORM is set to OFF Follow all Safety Regulations Hardware Installation PreparationUnpacking the unit Determine the best location for the chassisTake out the required amount of blank panels Unit InstallationFiber Driver EM316E3 & EM316E3SF Troubleshooting Technical Specifications Customer Support Americas SupportInternational Support Glossary Ordering InformationFiber Driver Division of MRV Fiber Driver EM316E3 & EM316E3SF