TB T 3377-2019 铁路数字移动通信系统（GSM-R）接口 C D接口（MSC VLR与 HLR间）.pdf

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TB T 3378-2019 铁路数字移动通信系统(GSM-R)接口 Gb接口 (BSC PCU与SGSN间).pdf

TB T 3380-2021 铁路数字移动通信系统（GSM-R）接口 Gn 接口（SGSN GGSN 与 SGSN GGSN 间）.pdf

TB T 3381-2021 铁路数字移动通信系统（GSM-R）接口 Gr 接口（SGSN 与 HLR 间）.pdf

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