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 29 June 2017 with a comparison to the same period in the previous 2 years.

Integrated Service Digital Network (ISDN)
London > City of London
3 months to
29 Jun 2017
Same period 2016 Same period 2015
Rank 230 256 322
Rank change year-on-year +26 +66  
Permanent jobs citing ISDN 5 11 3
As % of all permanent IT jobs advertised in the City of London 0.098% 0.17% 0.029%
As % of the Communications & Networking category 0.59% 1.05% 0.20%
Number of salaries quoted 5 5 3
City of London median annual salary £60,000 £57,500 £57,500
Median salary % change year-on-year +4.34% -  
London median annual salary £55,000 £57,500 £45,000
% change year-on-year -4.34% +27.77%  

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 841 1052 1499
As % of all permanent IT job vacancies advertised in the City of London 16.40% 16.57% 14.50%
Number of salaries quoted 2544 2816 3650
City of London median annual salary £55,000 £55,000 £54,500
Median salary % change year-on-year - +0.91%  
10th Percentile £28,500 £31,250 £31,250
90th Percentile £75,000 £77,500 £72,500
London median annual salary £55,000 £55,000 £50,000
% change year-on-year - +10.00%  

ISDN
Job Vacancy Trend in the City of London

Job postings citing ISDN as a percentage of all IT jobs advertised in the City of London.

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

For the 6 months to 29 June 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 7 (100.00%) VoIP
2 6 (85.71%) Windows
2 6 (85.71%) TCP/IP
2 6 (85.71%) Microsoft
2 6 (85.71%) Active Directory
2 6 (85.71%) Windows Server
3 5 (71.43%) Customer Requirements
3 5 (71.43%) Skype
3 5 (71.43%) Presales
3 5 (71.43%) MCSE
3 5 (71.43%) SharePoint
3 5 (71.43%) MS Exchange
3 5 (71.43%) Microsoft Certification
3 5 (71.43%) PowerShell
3 5 (71.43%) Windows Server 2008
3 5 (71.43%) Skype for Business
3 5 (71.43%) Unified Communications
3 5 (71.43%) MCITP
3 5 (71.43%) Windows Server 2012
4 2 (28.57%) Cisco Certification
4 2 (28.57%) CCNA
4 2 (28.57%) Cisco
5 1 (14.29%) ITIL
5 1 (14.29%) DNS
5 1 (14.29%) LAN
5 1 (14.29%) WAN
5 1 (14.29%) DHCP
5 1 (14.29%) Ethernet
5 1 (14.29%) Performance Monitoring
5 1 (14.29%) WFM

ISDN
Co-occurring 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:

Application Platforms
1 5 (71.43%) MS Exchange
1 5 (71.43%) SharePoint
1 5 (71.43%) Skype for Business
Communications & Networking
1 7 (100.00%) VoIP
2 6 (85.71%) TCP/IP
3 5 (71.43%) Skype
3 5 (71.43%) Unified Communications
4 1 (14.29%) DHCP
4 1 (14.29%) DNS
4 1 (14.29%) Ethernet
4 1 (14.29%) Firewall
4 1 (14.29%) IP Telephony
4 1 (14.29%) LAN
4 1 (14.29%) WAN
General
1 1 (14.29%) Telecoms
Job Titles
1 5 (71.43%) Lync Engineer
1 5 (71.43%) Unified Communications Engineer
2 1 (14.29%) Support Engineer
2 1 (14.29%) Telephony Engineer
2 1 (14.29%) Telephony Support
2 1 (14.29%) Voice Engineer
2 1 (14.29%) Voice Network Engineer
Operating Systems
1 6 (85.71%) Windows
1 6 (85.71%) Windows Server
2 5 (71.43%) Windows Server 2008
2 5 (71.43%) Windows Server 2012
Processes & Methodologies
1 5 (71.43%) Customer Requirements
1 5 (71.43%) Presales
2 1 (14.29%) Continuous Improvement
2 1 (14.29%) ITIL
2 1 (14.29%) Performance Monitoring
2 1 (14.29%) Trend Analysis
2 1 (14.29%) WFM
Programming Languages
1 5 (71.43%) PowerShell
Qualifications
1 5 (71.43%) MCITP
1 5 (71.43%) MCSE
1 5 (71.43%) Microsoft Certification
2 2 (28.57%) CCNA
2 2 (28.57%) Cisco Certification
System Software
1 6 (85.71%) Active Directory
Systems Management
1 1 (14.29%) Cisco CUCM
Vendors
1 6 (85.71%) Microsoft
2 2 (28.57%) Cisco
3 1 (14.29%) IPFX
3 1 (14.29%) Verint