He aha te wāhanga o tētahi pūnaha i hiahiatia kia whakamahia hei whakatutuki i tētahi pūtake o waho? I runga i te pātai o mua, tuhia he horopaki kei roto te whakautu. Ka taea te 1 - 20 rerenga kōrero. Te horopaki:
E rua ngā momo whatunga X.25. Ko etahi penei i te DATAPAC me te TRANSPAC i whakatinanahia i te tuatahi me te X.25 atanga o waho. Ko etahi o nga whatunga tawhito penei i te TELENET me te TYMNET i whakarerekehia hei whakarato i tetahi atanga ope X.25 hei taapiri ki nga mahere hononga o mua. I whakawhanakehia te DATAPAC e Bell Northern Research he hononga o Bell Canada (he kaikawe noa) me Northern Telecom (he kaiwhakarato taputapu whakawhitiwhiti korero). I hokona e Northern Telecom etahi momo DATAPAC ki nga PTT o tawahi tae atu ki te Deutsche Bundespost. I whakaaetia e X.75 me X.121 te honohono o nga whatunga X.25 motu. Ka taea e te kaiwhakamahi, te kaihautū rānei te karanga i tētahi kaihautū i runga i tētahi whatunga kē mā te whakauru i te DNIC o te whatunga mamao hei wāhanga o te wāhitau ūnga. [ citation needed ]