Quote:
Originally Posted by julie_m
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The Harewood thing might have been charging-related (and subsequently found not to be worth bothering to charge the extra for), or it might have had something to do with numbers of trunk lines between exchanges.
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Harewood was a small Unit Automatic eXchange No 13 - 167 lines in 1972 when its STD code was 0973 36. The 0973 XX group were on 8XX off Leeds Group Switching Centre. Thus Harewood was on level 836 off Leeds after about 1963 - previous it had been 826 off Leeds. However it also had another direct junction route rom Harrogate (0423) GSC where it was reached by dialling 930.
In 1975 Harewood was moved into the Leeds 'Linked Numbering Scheme' (STD code 0532) by prefixing the three digit UAX13 numbers with 886. Thus other exchanges in the 0532 group just dialled 886XXX and STD callers dialled 0532 886XXX. However the junctions to Harrogate would not be accessible as the code to Harrogate from Harewood might have 'clashed' with other codes within the 0532 LNS or would not be sufficient to carry all the traffic from the Leeds LNS so 'Harewood' was kept partially out of the LNS by having 'Harewood' subs dial the '9' to reach other exchanges in the LNS. However by 1988, Harewood is listed as a UAX13S - the 'satellite' version of the UAX13 Which looked at the initial two digits of those dialled and routed to the rest of the UAX13 for local calls and dropped the junction to the main exchange (Leeds 'main') otherwise it dropped the local exchange side out as all the digits had been pulsed out to Leeds. There would have been no need for the '9' at this time. Then on 15 March 1988, it went 'digital' with a System X concentrator and the 'subscribers' became 'Leeds' numbers - fully within the Linked Numbering Scheme.
The 'Harwewood' setup was not unique. Deeside exchange in the 0244 Chester Charge Group was originally Connah's Quay Non-Director was originally 0244 51 (level 51 off Chester). 'Deeside' was originally a mobile exchange on level 86 off Chester. Both dialled 9 to reach the GSC 'Chester/a' main exchange. There were at the time other exchanges in the 0244 Chester LNS. However when Connah's Quay, Deeside and another mobile Estuary on 69 off Chester were moved into the LNS now to be known as 'Deeside', they were in a separate group which needed to dial a 9 to reach Chester . This was because Connah's Quay had direct junctions to exchanges in adjacent charge such as Mold (0352) on level 85. The code could have clashed with other codes off Chester which was getting short of codes. Where I live with a Mold phone number I could dial either 91 or 95 to reach Deeside - 91 took me via Chester/A main exchange and the 95 took me over the direct junctions from Mold to 'Deeside'