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• CCITT Rec. M.300 (11/1988) – DEFINITIONS CONCERNING INTERNATIONAL TRANSMISSION SYSTEMS
• 1 Definitions concerning international analogue transmission systems
  • 1.1 line link (using symmetric pairs, coaxial pairs, radio-relay link, etc.)
  • 1.2 group section
  • 1.3 group link
  • 1.4 group
  • 1.5 supergroup section
  • 1.6 supergroup link
  • 1.7 supergroup
  • 1.8 mastergroup section
  • 1.9 mastergroup link
  • 1.10 mastergroup
  • 1.11 supermastergroup section
  • 1.12 supermastergroup link
  • 1.13 supermastergroup
  • 1.14 15 supergroup assembly section
  • 1.15 15 supergroup assembly link
  • 1.16 15 supergroup assembly
  • 1.17 through-group connection point
  • 1.18 through-supergroup connection point
  • 1.19 through-mastergroup connection point
  • 1.20 through-supermastergroup connection point
  • 1.21 through-15 supergroup assembly connection point
  • 1.22 regulated line section (symmetric pairs, coaxial pairs or radio relay links)
• 2 Definitions concerning international digital transmission systems
  • 2.1 alarm indication signal (AIS)
  • 2.2 upstream failure indication
  • 2.3 primary block (American: digroup)
  • 2.4 PCM multiplex equipment
  • 2.5 digital multiplexer
  • 2.6 muldex
  • 2.7 digital multiplex equipment
  • 2.8 digital multiplex hierarchy
  • 2.9 transmultiplexer
  • 2.10 digital distribution frame
  • 2.11 digital section
  • 2.12 digital path
  • 2.13 digital line section
  • 2.14 digital line system
  • 2.15 digital block
  • 2.16 digital line path
  • 2.17 digital radio section
  • 2.18 digital radio system
  • 2.19 digital radio path
• 3 General definitions for international transmission systems
  • 3.1 national section
  • 3.2 international section
  • 3.3 main section
• 4 Definitions concerning international channels
  • 4.1 analogue channel
  • 4.2 digital channel
  • 4.3 mixed analogue/digital channel
• References