Auswahl Router für Glasfaser der Telekom

2.2 Physical layer Requirements (PMD-Layer) for GPON-ONT
The ONT must meet the following Physical Layer requirements:

a) The GPON interface implemented in the ONT must fully support ONT functionality according to the following ITU-T Recommendation series: G.984.x (G.984.1 [1], G.984.2 [2], G.984.3 [3], and G.984.5 [4]) and G.988 [5]; including all Annexes and Amendments.

b) The IFPON-interface must be a single fiber interface only.

c) The ONT must operate on a single mode optical fiber according ITU-T G.652 D [6].

d) The ONT must operate on bending loss insensitive single mode optical fiber according to ITU-T G.657 A1 or A2 [7].

e) The downstream (2488.32 Mbit/s) and upstream (1244.16 Mbit/s) bit rates of the ONT optical interfaces must fully comply with the requirements of ITU-T Recommendation series G.984.x.

f) The ONT must use NRZ coding + scrambling for the line code.

g) In the downstream direction the ONT must operate in the wavelength range between 1480 – 1500 nm. In the upstream direction the ONT must operate in the “Reduced wavelength band option” (1290 – 1330 nm) or in the “Narrow wavelength band option” (1300 - 1320 nm) according to the reduction of the upstream wavelength window described in ITU-T G.984.5 [4].

h) The minimum optical sensitivity requirements of the ONT must be met in the presence of interference signals caused by NG-PON-systems (e.g. XG-PON1, XGS-PON, NG-PON2) and/or video signals (RF-overlay) in the enhancement bands specified in ITU-T Rec. G.984.5 [4], Table 1. To minimize the effect of interference signals, the GPON-ONT must be equipped with appropriate wavelength blocking filters (WBF) and WDM filter to isolate interference signals. The GPON-ONT must meet the X/S-tolerance mask (S is the optical power of the basic band signal and X is the optical power of the interference signal(s)) specified in ITU-T Rec. G.984.5 [4], chapter 8.
Amendment 1 to 1 TR 112
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i) The ONT must support the minimum requirements for Class B+ according to G.984.2 (08/2019) [2] Annex A (Industry Best Practice), Table A.1/G.984.2.

j) The ONT must support the minimum requirements for Class C+ according to G.984.2 (08/2019) [2] Appendix V, Table V.1/G.984.2.

k) The ONT must support the minimum requirements for Class D according to G.984.2 (08/2019) [2] Appendix V, Table V.2/G.984.2.

NOTE – The ONU sensitivity for Class C+ and/or D assumes the use of the optional RS (255,239) FEC capability of the GPON TC layer with the current class B+ ONU detector technology and a more powerful OLT-Transceiver. It is the discretion of DT to use transceivers for Class B+ or C+ or D in the OLT. A common ONT must comply with this requirement.