Integrated Service Digital Network (ISDN) Central London> City of London
The table below provides summary statistics for permanent job vacancies advertised in the City of London requiring ISDN skills. It includes a benchmarking guide to the annual salaries offered in vacancies that cited ISDN over the 6 months leading up to 31 May 2025, comparing them to the same period in the previous two years.
6 months to 31 May 2025
Same period 2024
Same period 2023
Rank
138
177
229
Rank change year-on-year
+39
+52
-
Permanent jobs citing ISDN
1
1
1
As % of all permanent jobs advertised in the City of London
ISDN falls under the Communications and Computer Networking category. For comparison with the information above, the following table provides summary statistics for all permanent job vacancies requiring communications or computer networking skills in the City of London.
Permanent vacancies with a requirement for communications or computer networking skills
233
452
505
As % of all permanent jobs advertised in the City of London
11.91%
13.51%
11.28%
Number of salaries quoted
195
332
400
10th Percentile
£35,000
£31,775
£32,500
25th Percentile
£42,500
£40,750
£40,000
Median annual salary (50th Percentile)
£62,500
£55,000
£62,500
Median % change year-on-year
+13.64%
-12.00%
-
75th Percentile
£81,875
£77,500
£77,500
90th Percentile
£99,000
£93,625
£100,000
Central London median annual salary
£62,500
£55,000
£62,500
% change year-on-year
+13.64%
-12.00%
+0.81%
ISDN Job Vacancy Trend in the City of London
Job postings citing ISDN as a proportion of all IT jobs advertised in the City of London.
ISDN Salary Trend in the City of London
3-month moving average salary quoted in jobs citing ISDN in the City of London.
ISDN Top 11 Co-occurring Skills and Capabilities in the City of London
For the 6 months to 31 May 2025, job vacancies citing ISDN also mentioned the following skills and capabilities in order of popularity.
The figures indicate the absolute number co-occurrences and as a proportion of all permanent job ads across the City of London region with a requirement for ISDN.
ISDN Co-occurring Skills and Capabilities in the City of London by Category
The follow tables expand on the table above by listing co-occurrences grouped by category.
The same employment type, locality and period is covered with up to 20 co-occurrences shown in each of the following categories:
