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OSN1500 device failed to interface with Metro1000 SDH transport device with different overhead bytes
| 2025-11-21|Back

When OSN1500 devices and Metro1000 devices are connected to the network, you need to pay attention to the correspondence of the broadcast data interface to ensure the successful connection of broadcast data services.

OptiX OSN 1500A/1500B

  • OptiX OSN 1500A/1500B
  • OptiX OSN 2500
  • OptiX OSN 3500
  • OptiX OSN 3500II
  • OptiX OSN 7500

Failure Category

Device docking failure

Phenomenon Description

The OptiX OSN1500 device and the SDH device Metro 1000 are docked in a network, and the Serial 1 port of the OSN device is docked with the Serial 1 port of the Metro 1000 to transparently transmit a broadcast data service, and it is found that the service is not available.

Cause Analysis

The transmission device utilizes four unused overhead bytes to transmit broadcast data.

The OptiX OSN device's broadcast data interface is defined as follows:
  • The Serial 1 byte of the OSN is defined in the SDH overhead byte as the 1st unused byte after D3 in the regeneration segment. The physical port is typically the S1 port.
  • The Serial 2 byte of the OSN is defined in the SDH overhead byte as the 2nd unused byte after D3 in the regeneration segment. The physical port is typically the S2 port.
  • The Serial 3 byte of the OSN is defined in the SDH overhead byte as the 2nd unused byte after D12 in the reuse segment. The physical port is typically the S3 port.
  • The Serial 4 byte of the OSN is defined in the SDH overhead byte as the 1st unused byte after D4 in the multiplexed segment. The physical port is typically the S4 port.
The broadcast data interface of the SDH device is defined as follows:
  • The SDH Serial 1 byte corresponds to the F2 byte and is the 2nd unused byte after D12 in the multiplexing segment. The physical port is typically the F2 port.
  • The Serial 2 byte of the SDH corresponds to the X1 byte, which is the 1st unused byte of D4 in the multiplexed segment. The physical port is generally the COM2 port.
  • Serial 3 byte of SDH corresponds to X2 byte, which is the 1st unused byte of D3 in the regeneration segment. The physical port is generally the COM3 port.
  • Serial 4 byte of SDH corresponds to X3 byte, which is the 2nd unused byte of D3 in the regeneration segment. The physical port is generally the COM4 port.
You can derive the correspondence between the OSN1500 and the serial port of the SDH device Metro1000 Optical:
  • Serial 1 of SDH: corresponds to Serial 3 of OSN.
  • Serial 2 of SDH: corresponds to Serial 4 of OSN.
  • Serial 3 of SDH: corresponds to Serial 1 of OSN.
  • Serial 4 of SDH: corresponds to Serial 2 of OSN.

From this, it can be seen that the service configuration failure is caused by the wrong Serial correspondence between the OSN device and the SDH device.

Operation Steps

  1. According to the Serial port correspondence, reconfigure the broadcast data service of the OSN equipment interfacing with the SDH equipment, so that the two ends of the equipment correspond and the fault is solved.

The technical information in this chapter and the related SDH equipment troubleshooting procedures are provided by Shenzhen Optical Transmission Network Technology Co. Huawei SDH optical transmission equipment, SDH transmission equipment sales phone: 13430988088 Welcome to call!


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