LTPS-UM-8013-03

Overview

 

 

OVERVIEW

The Soneplex® DS3 Loop Extender (D3LX) modules shown in Figure 1 are a pair of fiber-optic units that provide DS3 service. The D3LX CO resides at the Central Office (CO) site, and the D3LX RMT resides at the Customer Premises Equipment (CPE) or remote site.

D3LX C

D3LX R

 

O

 

MT

STATUS

STATUS

FAR

END

FAR

END

 

 

DS3

STATUS

DS3

STATUS

 

 

ENABLE

ENABLE

DS3

ONLINE

DS3

ONLINE

 

 

Figure 1. D3LX CO and D3LX RMT Modules

The D3LX CO module occupies two card slots in a local, Soneplex Loop Extender Chassis (LEC). The D3LX RMT module occupies two card slots in a Four-Position Remote Terminal Cabinet, or Two-Position QLX Remote BNC Chassis. A D3LX Remote Craft Access Module (D3RCAM) may also installed to provide maintenance terminal access at the remote site. For more information on the D3RCAM, refer to LTPS-UM-8017-xx, the Four-Position Remote Terminal Cabinet, refer to ADCP-61-151, or the Two-Position QLX Remote BNC Chassis, refer to LTPS-UM-8029-xx.

The D3LX modules are part of a system that converts a metallic DS3 circuit at the CO site into a DS3 optical signal that uses Wavelength Division Multiplexing (WDM) to transmit a signal across one single-mode fiber to a D3LX RMT via a D3LX LTU at the CPE site. The D3LX RMT module converts the optical signal back into an electrical DS3 and transmits the signal back to the D3LX CO residing in the LEC as shown in Figure 2 on page 2.

The D3LX modules perform the following functions:

•Exchange status, alarm, and protection switching information.

•Perform bit error rate monitoring of the optical link.

•Monitor the optical input for Loss-Of-Signal (LOS) and Loss-Of-Frame (LOF).

•Monitor the laser bias for degradation.

•Retrieve remote module status.

•Provide 1+1 Protect mode (line protection).

D3LX CO and RMT Modules

August 30, 2002

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