Huawei OSN3500 SL16A single board supports functions and features such as receiving and transmitting 1 channel STM-16 optical signals, overhead processing, and multiplexed segment protection, etc. The OSN3500 N3SL16A supports optical interfaces with U-16.2Je (plus BA and PA), which is a Huawei customized standard.U-16.2Je is compatible with U-16.2, N3SL16A U-16.2Je Supports CWDM and DWDM color optical interfaces, and the optical interface uses LC connectors. Huawei CWDM optical interface supports 80km transmission distance, Huawei DWDM optical interface supports 120km and 170km transmission distance.

Huawei OSN3500 SSN3SL16A10 U-16.2Je Dual-Fiber Bidirectional Optical Interface Performance

Huawei SSN3SL16A supports SDH overhead byte customization function

The SDH overhead processing module contains RST, MST, MSA, and HPT submodules.The SDH overhead processing module supports the inner loopback and outer loopback functions.

• RST Submodule
  • In the receive direction, the RST submodule terminates the RSOH: detects the frame location bytes A1 and A2, descrambles all bytes except the bytes in the first line of the RSOH, recovers and examines the regenerative segment trace byte J0, and checks the B1 byte.
  • In the transmit direction, the RST submodule generates the RSOH: writes the bytes A1, A2, J0, calculates and writes the B1 byte, scrambles all bytes except the first row of bytes of the RSOH.
• MST Submodule
  • In the receive direction, the MST sub-module terminates the MSOH: detects the K2 byte, generates the MS_AIS alarm or the MS_RDI alarm; checks the B2 byte, generates the B2_SD or the B2_EXC alarm, and sends the MS_REI alarm to the opposite end.
  • In the transmit direction, the MST submodule generates MSOH: writes the bytes E2, D4 to D12, K1, K2, S1, M1, etc., calculates the BIP checksum value and writes the B2 byte.
• MSA Submodule
  • In the receive direction, the MSA sub-module interpolates the AUG, divides the AUG into N AU-4 structures, detects the AU_LOP and AU_AIS alarms, and performs pointer adjustment.
  • In the transmit direction, the MSA submodule adds the VC-4 to the AU-PTR to generate the AU-4, and then multiplexes the N AU-4s into AUGs by byte interpolation.
• HPT Submodule
  • In the receive direction, the HPT submodule terminates the POH: checks the B3 byte, sends the HP_REI alarm to the opposite end; detects the J1 and C2 bytes, generates the HP_TIM and HP_SLM alarms (and generates the HP_UNEQ alarm if it checks that the VC-4 channel is not loaded), and sends the HP_RDI alarm to the opposite end.
  • In the transmit direction, the HPT submodule generates the POH: writes the bytes J1, C2, etc., calculates the BIP checksum value and writes the B3 byte.

Huawei SSN3SL16A Single Board Working Principle and Signal Flow