System Y: Difference between revisions
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{{Short description|Digital switching system}} |
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'''System Y''' is a [[Digital telephone exchange]] system used by [[British Telecom]] as an alternative to the [[System X (telephony)|System X]]. System Y refers to the [[AXE telephone exchange|AXE 10]] system manufactured by [[Ericsson]]. |
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'''System Y''' is the terminology used by [[BT Group|BT]], the main operator of the telephone network in the [[United Kingdom]], to refer to the [[Ericsson]] [[AXE telephone exchange|AXE]] digital switching system. |
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In the mid-1980s, British Telecom chose the well established [[AXE10]] digital switch to provide competition for [[System X (telephony)|System X]] developed by a consortium of [[Plessey]], [[General Electric Company]] (GEC) (companies later combined as GPT), [[Standard Telephones and Cables|STC]] and BT's state owned predecessor, the [[General Post Office|GPO]]. The newly privatised BT brought in Ericsson as a competitive alternative supplier ending Plessey/GEC's monopoly on the provision of switching systems. |
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British Telecom decided to use the AXE10 digital telephony switching solution in the mid 1980s as a way of preventing total reliance on [[GEC]] (as it was at the time) System X as sole switching solution. This also meant GEC could not use a position of dominance as a way of charging BT unfair amounts for provision of System X equipment parts. Although System X is more abundant in BTs network, AXE10 is still widespread in Britain. |
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Initially, the AXE systems installed in the UK were partially locally manufactured in partnership with [[Thorn EMI]] and later directly by Ericsson. While System X exchanges were more widespread in BT's network, AXE10 (and subsequent versions) remain common in the classic BT [[public switched telephone network|PSTN]] until their eventual replacement when the network is closed, which at the time of the writing is expected to be in 2025 <ref>{{Cite web|url=https://business.bt.com/insights/digital-transformation/uk-pstn-switch-off/|title=The UK's PSTN network will switch off in 2025}}</ref> |
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| ⚫ | AXE10 covers two main types of digital telephony switching equipment |
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| ⚫ | AXE10 covers two main types of [[digital telephony]] switching equipment: the remote subscriber switch (RSS) and the AXE10 local switch. RSS acts as a [[remote concentrator]] and deals with the conversion of analogue telephony signals used in the [[access network]], which is the copper pairs between exchange buildings and customer premises, also called [[local loop]], and the multiplexing of customer lines over cabling to the AXE10 local switching unit. The AXE10 local switch uses a processor-controlled switch to route calls and data depending on the destination of the telephony transmission. |
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BT's AXE10 network (which is coming up to its twentieth birthday) is maintained 'in-house' by its own engineers although Ericsson still provide high-level support, software upgrades and repairs at component level. |
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BT's AXE10 network, which has been in service since 1986,<ref>[http://www.connected-earth.com/Galleries/Frombuttonstobytes/Digitaltelephony/Digitalswitching/index.htm "Digital Switching"] {{Webarchive|url=https://web.archive.org/web/20080725044548/http://www.connected-earth.com/Galleries/Frombuttonstobytes/Digitaltelephony/Digitalswitching/index.htm |date=2008-07-25 }}, ''Connected Earth'', accessed 2009-05-17</ref> is maintained in house by its own engineers although [[Ericsson]] still provide high-level support, software upgrades and repairs at component level. |
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Both System Y and System X are likely to be phased out as BT implements its [[BT 21CN|21st Century Network]] based on [[VoIP]] and replacing existing switches, ADSL and analogue equipment with fully digital [[Multiple Service Access Nodes]] (MSAN). |
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AXE/System Y, System X and other [[Time-division multiplexing|TDM]] technologies are already being be phased out as BT, in common with many networks around the world, implements its next generation access network, which will ultimately be based predominantly on fibre to premises (FTTP), with voice services provided using [[Voice over IP|VoIP]] technology. <ref>{{Cite web|url=https://www.ispreview.co.uk/index.php/2019/05/openreach-aim-for-15-million-uk-fttp-broadband-premises-by-2025.html|title = Openreach Aim for 15 Million UK FTTP Broadband Premises by 2025|date = 9 May 2019}}</ref> |
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==References== |
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{{reflist}} |
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{{BT Group}} |
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[[Category:Telephone exchange equipment]] |
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{{telephony-stub}} |
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Latest revision as of 12:14, 13 August 2024
System Y is the terminology used by BT, the main operator of the telephone network in the United Kingdom, to refer to the Ericsson AXE digital switching system.
In the mid-1980s, British Telecom chose the well established AXE10 digital switch to provide competition for System X developed by a consortium of Plessey, General Electric Company (GEC) (companies later combined as GPT), STC and BT's state owned predecessor, the GPO. The newly privatised BT brought in Ericsson as a competitive alternative supplier ending Plessey/GEC's monopoly on the provision of switching systems.
Initially, the AXE systems installed in the UK were partially locally manufactured in partnership with Thorn EMI and later directly by Ericsson. While System X exchanges were more widespread in BT's network, AXE10 (and subsequent versions) remain common in the classic BT PSTN until their eventual replacement when the network is closed, which at the time of the writing is expected to be in 2025 [1]
AXE10 covers two main types of digital telephony switching equipment: the remote subscriber switch (RSS) and the AXE10 local switch. RSS acts as a remote concentrator and deals with the conversion of analogue telephony signals used in the access network, which is the copper pairs between exchange buildings and customer premises, also called local loop, and the multiplexing of customer lines over cabling to the AXE10 local switching unit. The AXE10 local switch uses a processor-controlled switch to route calls and data depending on the destination of the telephony transmission.
BT's AXE10 network, which has been in service since 1986,[2] is maintained in house by its own engineers although Ericsson still provide high-level support, software upgrades and repairs at component level.
AXE/System Y, System X and other TDM technologies are already being be phased out as BT, in common with many networks around the world, implements its next generation access network, which will ultimately be based predominantly on fibre to premises (FTTP), with voice services provided using VoIP technology. [3]
References
[edit]- ^ "The UK's PSTN network will switch off in 2025".
- ^ "Digital Switching" Archived 2008-07-25 at the Wayback Machine, Connected Earth, accessed 2009-05-17
- ^ "Openreach Aim for 15 Million UK FTTP Broadband Premises by 2025". 9 May 2019.
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