DM984 product family CHAPTER 7. INTRODUCTION
of two main parts, the OLT and one or more ONUs. In general, all operations
to provision a GPON are issued at the OLT and sent via OMCI messages to the
ONU. An ODN connects the OLT and the ONUs.
As defined in the ITU-T G.984.1 standard[3] GPON devices are capable of pro-
cessing traffic up to 2.488 Gbit/s in downstream and 1.244 Gbit/s in upstream
direction.
The physical reach is the maximum physical distance between the ONU/ONT
and the OLT. In GPON, two options are defined for the physical reach: 10 km
and 20 km. It is assumed that 10 km is the maximum distance over which FP-LD
can be used. However, this ONU uses a DFB laser diode, so it is able to operate
at a maximum distance of 20 km.
Figure 7.2: GPON Architectures[3]
7.2 Transmission Containers (T-CONTs)
A transmission container or T-CONT is a group of logical connections. For one
ONU there are multiple T-CONTs possible. The number of supported T-CONTs
depends on the ONU software. One T-CONT has a specific bandwidth allocation.
Each T-CONT is supposed to provide different services.
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