TXK4 Transit

• STC BXB 1121 (ITT Pentaconta)

• 4 wire Transit Switching Centres

• 8 wires switched

• Introduced 1972 Birmingham

• 2 stage Group Unit (+) 2 stage Group Unit

• Mix of Pentaconta and 3000 type relays

• 27 DSCs, 8 MSCs & London MSC/SPU

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