The following table provides summary statistics for permanent job vacancies advertised in the City of London with a requirement for ISDN skills. Included is a benchmarking guide to the salaries offered in vacancies that have cited ISDN over the 3 months to 25 March 2017 with a comparison to the same period in the previous 2 years.

3 months to
25 Mar 2017
Same period 2016 Same period 2015
Integrated Service Digital Network (ISDN)
London / City of London
Rank 220 263 317
Rank change year-on-year +43 +54  
Permanent jobs citing ISDN 3 11 3
As % of all permanent IT jobs advertised in the City of London 0.059% 0.16% 0.029%
As % of the Communications & Networking category 0.36% 1.06% 0.15%
Number of salaries quoted 2 10 3
Median salary £45,000 £55,000 £47,500
Median salary % change year-on-year -18.18% +15.78%  
UK excluding London median salary £45,000 £37,000 £42,500
% change year-on-year +21.62% -12.94%  

ISDN is in the communications and computer networking skills category. The next table is for comparison with the above and provides summary statistics for all permanent job vacancies advertised in the City of London with a requirement for communications and computer networking skills.

Communications & Computer Network Skills
City of London
Permanent job vacancies with a requirement for communications and computer networking skills 844 1038 2016
As % of all permanent IT job vacancies advertised in the City of London 16.63% 14.65% 19.73%
Number of salaries quoted 797 908 1687
Median salary £47,500 £52,500 £53,000
Median salary % change year-on-year -9.52% -0.94%  
90% offered a salary of more than £26,000 £32,500 £34,000
10% offered a salary of more than £75,000 £70,000 £80,000
UK excluding London median salary £40,000 £42,500 £41,000
% change year-on-year -5.88% +3.65%  

ISDN
Job Vacancy Trend in the City of London

The job posting trend of jobs advertised in the City of London citing ISDN as a proportion of all permanent or contract IT jobs with a match in the Communications & Networking category.

Job vacancy trend for ISDN in the City of London

ISDN
Salary Trend in the City of London

This chart provides the 3-month moving average for salaries quoted in permanent IT jobs citing ISDN in the City of London.

Salary trend for ISDN in the City of London

ISDN
Salary Histogram in the City of London

The salary distribution of IT jobs citing ISDN in the City of London over the 3 months to 25 March 2017.

Salary histogram for ISDN in the City of London

ISDN
Top 30 Related IT Skills in the City of London

For the 6 months to 25 March 2017, IT jobs citing ISDN also mentioned the following skills in order of popularity. The figures indicate the number co-occurrences and its proportion to all job ads across the City of London region with a requirement for ISDN.

1 9 (100.00%) Cisco
1 9 (100.00%) CCNA
1 9 (100.00%) Cisco Certification
2 7 (77.78%) ITIL
2 7 (77.78%) LAN
2 7 (77.78%) WAN
2 7 (77.78%) TCP/IP
2 7 (77.78%) Firewall
3 6 (66.67%) Wireless
3 6 (66.67%) Network Security
3 6 (66.67%) e-Health
3 6 (66.67%) Network Design
3 6 (66.67%) JNCIA
3 6 (66.67%) JNCIS
3 6 (66.67%) JNCIP
3 6 (66.67%) JNCIE
3 6 (66.67%) VPN
3 6 (66.67%) Juniper
3 6 (66.67%) DV Cleared
3 6 (66.67%) Security Cleared
3 6 (66.67%) Network Monitoring
3 6 (66.67%) Broadband
4 3 (33.33%) VoIP
5 2 (22.22%) WFM
5 2 (22.22%) Verint
5 2 (22.22%) IPFX
5 2 (22.22%) Trend Analysis
6 1 (11.11%) Continuous Improvement
6 1 (11.11%) Cisco CUCM
6 1 (11.11%) Performance Monitoring

ISDN
Top Related IT Skills in the City of London by Category

The follow tables expand on the table above by listing co-occurrences grouped by category. The same job type, locality and period is covered with up to 20 co-occurrences shown in each of the following categories:

Communications & Networking
1 7 (77.78%) Firewall
1 7 (77.78%) LAN
1 7 (77.78%) TCP/IP
1 7 (77.78%) WAN
2 6 (66.67%) Broadband
2 6 (66.67%) Network Security
2 6 (66.67%) VPN
2 6 (66.67%) Wireless
3 3 (33.33%) VoIP
4 1 (11.11%) DHCP
4 1 (11.11%) DNS
4 1 (11.11%) Ethernet
4 1 (11.11%) IP Telephony
General
1 1 (11.11%) Telecoms
Job Titles
1 6 (66.67%) Analyst
1 6 (66.67%) Cisco Analyst
1 6 (66.67%) Cisco Network Analyst
1 6 (66.67%) Network Analyst
2 2 (22.22%) Support Engineer
2 2 (22.22%) Telephony Engineer
2 2 (22.22%) Telephony Support
3 1 (11.11%) Infrastructure Engineer
3 1 (11.11%) Infrastructure Support
3 1 (11.11%) Infrastructure Support Engineer
3 1 (11.11%) Voice Engineer
3 1 (11.11%) Voice Network Engineer
Miscellaneous
1 6 (66.67%) e-Health
Operating Systems
1 1 (11.11%) Windows
1 1 (11.11%) Windows Server
Processes & Methodologies
1 7 (77.78%) ITIL
2 6 (66.67%) Network Design
2 6 (66.67%) Network Monitoring
3 2 (22.22%) Trend Analysis
3 2 (22.22%) WFM
4 1 (11.11%) Continuous Improvement
4 1 (11.11%) Performance Monitoring
Qualifications
1 9 (100.00%) CCNA
1 9 (100.00%) Cisco Certification
2 6 (66.67%) DV Cleared
2 6 (66.67%) JNCIA
2 6 (66.67%) JNCIE
2 6 (66.67%) JNCIP
2 6 (66.67%) JNCIS
2 6 (66.67%) Security Cleared
System Software
1 1 (11.11%) Active Directory
Systems Management
1 1 (11.11%) Cisco CUCM
Vendors
1 9 (100.00%) Cisco
2 6 (66.67%) Juniper
3 2 (22.22%) IPFX
3 2 (22.22%) Verint
4 1 (11.11%) Microsoft