Connection Methods for Telephone Optical Terminal Power and Ground Wires
The standard model of the Telephone Optical Terminal is configured with DC-48V or AC~220V power supply. Before connecting power to the Telephone Optical Terminal, please first measure whether the voltage and power capacity of the incoming power supply are within the equipment's requirements:
-48V power supply: -48V±10%; AC220V power supply: standard AC220V±20%, 50Hz;
Before introducing power to the Telephone Optical Terminal, please check whether the power switch of the Telephone Optical Terminal is set to OFF. If it is not set to OFF, please set it to OFF;
Check whether the -48V power wire, GND (working ground) wire, and PGND (protective ground) wire are connected correctly and whether the polarity is reversed. Note: The working ground and protective ground of the Telephone Optical Terminal are separate, and the protective ground is connected to the chassis. If necessary, the working ground and protective ground can be connected at the backplane power connection point. Please be sure to properly resolve the common grounding issue!
Grounding technical recommendation: The chassis enclosure of the Telephone Optical Terminal should be connected to the protective ground. If the central office provides separate working ground and protective ground, the working ground and protective ground of the Telephone Optical Terminal should be connected to the corresponding grounding copper bars. If the central office provides only one grounding copper bar, the working ground and protective ground of the Telephone Optical Terminal are allowed to be jointly grounded, and the grounding resistance should meet the requirement that the DC working ground resistance is no greater than 4Ω.
The GND (power working ground) and PGND (protective ground) of the Telephone Optical Terminal must be properly connected. Only after confirming that the power wires are correctly connected can the equipment be powered on. If any abnormal condition occurs after power-on, immediately disconnect the power and inspect and troubleshoot!
The -48V working power wire is red, the GND (working ground wire) is black, and the PGND (protective ground wire) is yellow-green or white. Pay attention to the distinction during connection, and never reverse the power polarity!
Raytrans' Telephone Optical Terminal can provide 2 shared line-speed 100M Ethernet interfaces and 6 groups of transparent E1 interfaces, while also providing FXO and FXS interfaces with caller ID functionality, supporting up to 300 user voice channels.
It provides 13 slot positions, with 1+1 redundant power supplies, 10 service cards, and 1 main control card. All slots support hot-swapping.
By multiplexing narrowband and broadband services into a 155M optical transmission channel, it achieves the effect of simplifying transmission lines while saving costs. The equipment features a plug-in card structure design, with each service card providing 30 telephone lines. The equipment is easy to install and convenient to maintain.
