Loading Calculator...
Determine if large TCAP/MAP payloads require SCCP extended segmentation (XUDT/LUDT) based on underlying SS7 MTP3 constraints.
Simulation Parameters
Awaiting Simulation
Adjust payload size and transport limits to analyze fragmentation strategy.
Traditional SS7 Narrowband (TDM) has a strict limit of 272 bytes per MSU (Message Signal Unit). When a TCAP or MAP payload exceeds this (after SCCP/TCAP headers), it must be divided.
XUDT (Extended Unitdata) is used for segmentation in narrowband networks.LUDT (Long Unitdata) is common in SIGTRAN/IP networks allowing larger single chunks up to 4KB.
In 2G/3G networks, USSD strings or Camel IDPs can easily exceed the 272-byte limit. Failure to correctly configure SCCP segmentation parameters at the GMSC or HLR leads to silent message drops or "Protocol Error" TCAP aborts.
Ensure your Signal Transfer Points (STPs) and local SCCP stacks support segment reassembly markers. Class 1 is highly recommended for sequenced delivery to ensure correct reassembly.