2.18.10 Multiple PC

Multiple PC features:
  • This feature proposes to start support for Secondary Point Codes and increase the number of supported Capability point codes.
  • Multiple Point Code (MPC) feature shall allow the vSTP to add the support of Secondary Point Codes (SPCs) in addition to the true point codes used by the vSTP in any of the three domains ANSI, ITUN/ITUN-Spare (14-bit or 24-bit) and ITUI/ITUI-Spare.
  • This is a different concept from capability point codes. The provisioning and routing will use secondary point codes as if they were the actual point code of the vSTP. SPCs are supported for any type of link (A, B, C, D, so on).
  • In addition to the one True Point Code (TPC) already supported for each of the ANSI, ITU-N (14-bit or 24-bit) and ITU-Idomains, the vSTP support a pool of Secondary Point Codes (SPC), each of which may be assigned as either ANSI,ITUI/ITUI-Spare, 14-bit ITUN/ITUN-Spare, or 24-bit ITUN.
  • In addition to the SPCs this feature also recommends increasing the number of CPCs supported by the vSTP.
  • Currently only 1 CPC is supported. This number shall be increased to 100. The increase CPC would allow the vSTP to support more applications on the same node and allow route-on-gt functionality for routing to various application.
  • MPC feature creates the framework to allow provisioning and usage of SPCs in vSTP. This change shall primary affect the provisioning and routing algorithms. In addition to the SPC’s the CPC shall also be increased.

TUI-Spare/ITUN-Spare

  • The vSTP to fully support ITU National Spare and ITU International Spare by providing a new PC sub type named Spare.
  • ITUN_S and ITUI_S indicates a Spare point code. Spare point codes only apply to ITU-I and ITU-N point code types.

Figure 2-74 ITUI-Spare/ITUN-Spare


ITUI-Spare/ITUN-Spar

  • The subservice field contains the network indicator and two spare bits. The network indicator is used by signaling message handling function.
  • The vSTP currently provides full supportfor four types of point codes (PC) – ANSI, ITU-National (NI=10binary ), ITU-National 24-bit, andITU-International (NI=00 binary ). ITU NationalSpare PCs (NI=11 binary ) and ITU International Spare(NI= 01 binary) PCs can be primarily supported.
  • If the Spare PC feature is enabled then vSTP will validate the NI value of incoming message on designated linkset . If NI value matches then link will be mark available otherwise message will be discarded.