What does olt device mean?

olt equipment is a terminal equipment used to connect optical fiber trunks, and is the abbreviation of optical line terminal; olt equipment can be connected to the front-end switch with a network cable, converted into optical signals, and split with the user end using a single optical fiber The device interconnection realizes the control, management and ranging of user equipment ONU. It is an integrated photoelectric device.

The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

What does olt equipment mean

olt is the abbreviation of optical line terminal, which is a terminal equipment used to connect optical fiber trunk lines. OLT equipment is an important central office equipment. It can be connected to the front-end (aggregation layer) switch through network cables, converted into optical signals, and interconnected with the user end optical splitter through a single optical fiber; to realize the control and ranging of the user terminal equipment ONU ; Like ONU equipment, it is an optoelectronic integrated equipment.

Introduction to olt equipment

OLT equipment is an important central office equipment. It can be connected to the front-end (aggregation layer) switch with a network cable and converted into optical signals. The optical fiber is interconnected with the user-side optical splitter; it realizes the control, management, and ranging of the user-side equipment ONU; and like the ONU equipment, it is an integrated optoelectronic device.

Function of olt device

Send Ethernet data to ONU (Optical Network Unit) through broadcast;

Start and control the ranging process and record the ranging information;

Allocate bandwidth to the ONU; that is, control the start time and size of the sending window for the ONU to send data.

Composition of olt equipment

OLT system hardware design usually consists of three parts: backplane, main control board and single-board OLT. The backplane is mainly used to connect multiple OLT boards and the main control board. In actual projects, it can be designed in the form of 4 single boards (that is, including 4 PON ports) or 20 single boards (including 20 PON ports). The main control board is mainly used to control and manage multiple OLT boards, implement centralized management of ONUs, remote monitoring, remote commissioning and maintenance, and remote online upgrade services. The main control board is connected to the single-board OLT through MII (Media Independent Interface). The design mainly describes the hardware design and implementation of a single OLT board.

The role of olt equipment in the GPON network

OLT performs two functions. The main function of OLT is to control information floating throughout the optical distribution network (ODN). Located in both directions of the central office at the same time. The maximum distance supported by ODN transmission is 20 km. OLT has two floating directions: upstream (distributing different types of data and voice traffic from users) and downstream (taking data, voice and video traffic from the metropolitan area network or long-distance network and sending it to all ONT modules) ODN.

Extended functions of olt equipment

In addition to providing business aggregation functions, OLT is also a centralized network management platform. Device-based network element management and service-based security management and configuration management can be implemented on the OLT. It can not only monitor and manage devices and ports, but also perform service provisioning and user status monitoring. It can also allocate bandwidth according to the QoS/SLA requirements of different users.

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