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LTPS-UM-8013-03 Overview
D3LX CO and RMT Modules August 30, 2002 1
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.
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
C
O
STATUS
DS3 STATUS
ENABLE
DS3 ONLINE
FAR END
D3LX
R
M
T
STATUS
DS3 STATUS
ENABLE
DS3 ONLINE
FAR END