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

Note that daily and hourly rates are treated separately in these statistics. When calculating contractor rate percentiles, daily rates are never derived from quoted hourly rates or vice versa.

Integrated Service Digital Network (ISDN)
London / City of London
3 months to
25 Jun 2017
Same period 2016 Same period 2015
Rank 152 163 200
Rank change year-on-year +11 +37  
Contract jobs citing ISDN 11 3 2
As % of all contract IT jobs advertised in the City of London 0.34% 0.090% 0.034%
As % of the Communications & Networking category 3.28% 0.65% 0.27%
Number of daily rates quoted 7 1 0
Median daily rate £413 £275 -
Median daily rate % change year-on-year +50.00% -  
UK excluding London median daily rate £400 £336 £338
% change year-on-year +19.04% -0.44%  
Number of hourly rates quoted 3 1 0
Median hourly rate £24.86 £26.00 -
Median hourly rate % change year-on-year -4.38% -  
UK excluding London median hourly rate - £12.38 £41.29
% change year-on-year - -70.02%  

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 contract job vacancies advertised in the City of London with a requirement for communications and computer networking skills.

Contract Communications & Computer Network Skills
City of London
Contract job vacancies with a requirement for communications and computer networking skills 335 463 749
As % of all contract IT job vacancies advertised in the City of London 10.23% 13.93% 12.87%
Number of daily rates quoted 259 365 554
Median daily rate £425 £463 £417
Median daily rate % change year-on-year -8.10% +11.04%  
90% offered a daily rate of more than £215 £288 £298
10% offered a daily rate of more than £600 £580 £550
UK excluding London median daily rate £375 £365 £340
% change year-on-year +2.73% +7.35%  
Number of hourly rates quoted 10 6 25
Median hourly rate £24.86 £19.00 £18.34
Median hourly rate % change year-on-year +30.84% +3.59%  
90% offered a hourly rate of more than £21.40 £17.50 £15.90
10% offered a hourly rate of more than £30.00 £25.60 £30.01
UK excluding London median hourly rate £28.00 £31.50 £25.00
% change year-on-year -11.11% +26.00%  

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 contract or permanent IT jobs with a match in the Communications & Networking category.

Job vacancy trend for ISDN in the City of London

ISDN
Contractor Daily Rate Trend in the City of London

This chart provides the 3-month moving average for daily rates quoted in contract jobs citing ISDN in the City of London.

Contractor daily rate trend for ISDN in the City of London

ISDN
Contractor Daily Rate Histogram in the City of London

The daily rate distribution of IT jobs citing ISDN in the City of London over the 3 months to 25 June 2017.

Contractor daily rate histogram for ISDN in the City of London

ISDN
Contractor Hourly Rate Trend in the City of London

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

Contractor hourly rate trend for ISDN in the City of London

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

1 13 (100.00%) Cisco
2 11 (84.62%) VoIP
3 10 (76.92%) TCP/IP
4 9 (69.23%) Firewall
4 9 (69.23%) HSRP
4 9 (69.23%) 802.1X
5 8 (61.54%) VLAN
6 7 (53.85%) SolarWinds
6 7 (53.85%) Network Management
6 7 (53.85%) TACACS
6 7 (53.85%) Q.931
6 7 (53.85%) Cisco Prime
6 7 (53.85%) DPNSS
6 7 (53.85%) PPP
6 7 (53.85%) SNMP
7 5 (38.46%) Cisco Certification
7 5 (38.46%) Cisco ASA
8 4 (30.77%) NetScaler
8 4 (30.77%) Citrix
8 4 (30.77%) Microsoft
8 4 (30.77%) CCNP
8 4 (30.77%) PSTN
8 4 (30.77%) Windows
9 3 (23.08%) Ethernet
9 3 (23.08%) Cisco IOS
10 2 (15.38%) Fortinet
10 2 (15.38%) NGN
10 2 (15.38%) Load Balancing
10 2 (15.38%) Handset
10 2 (15.38%) Mitel

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 2 (15.38%) Skype for Business
Business Applications
1 1 (7.69%) Cisco SocialMiner
Communications & Networking
1 11 (84.62%) VoIP
2 10 (76.92%) TCP/IP
3 9 (69.23%) Firewall
3 9 (69.23%) HSRP
4 8 (61.54%) VLAN
5 7 (53.85%) DPNSS
5 7 (53.85%) PPP
5 7 (53.85%) Q.931
5 7 (53.85%) SNMP
5 7 (53.85%) TACACS
6 5 (38.46%) Cisco ASA
7 4 (30.77%) NetScaler
7 4 (30.77%) PSTN
8 3 (23.08%) Cisco IOS
8 3 (23.08%) Ethernet
9 2 (15.38%) Cisco Nexus
9 2 (15.38%) DHCP
9 2 (15.38%) NGN
9 2 (15.38%) PABX
9 2 (15.38%) WAN
General
1 2 (15.38%) Telecoms
Job Titles
1 4 (30.77%) Security Engineer
2 3 (23.08%) Cisco Engineer
2 3 (23.08%) Cisco Specialist
2 3 (23.08%) Network Engineer
2 3 (23.08%) Senior Network Engineer
3 2 (15.38%) Cisco Network Engineer
3 2 (15.38%) Cisco VoIP Specialist
3 2 (15.38%) Data Centre Engineer
3 2 (15.38%) ICT Engineer
3 2 (15.38%) Mitel Specialist
3 2 (15.38%) Senior Security Engineer
3 2 (15.38%) Telecoms Specialist
3 2 (15.38%) VoIP Specialist
4 1 (7.69%) Cisco Network Specialist
4 1 (7.69%) Network Specialist
4 1 (7.69%) Telephony Engineer
4 1 (7.69%) Unified Communications Specialist
Libraries, Frameworks & Software Standards
1 9 (69.23%) 802.1X
2 1 (7.69%) XMPP
Miscellaneous
1 2 (15.38%) Data Centre
1 2 (15.38%) Handset
2 1 (7.69%) Analytical Skills
Operating Systems
1 4 (30.77%) Windows
Processes & Methodologies
1 7 (53.85%) Network Management
2 2 (15.38%) High Availability
2 2 (15.38%) Load Balancing
3 1 (7.69%) Migration
3 1 (7.69%) Project Management
Qualifications
1 5 (38.46%) Cisco Certification
2 4 (30.77%) CCNP
3 1 (7.69%) CCNA
3 1 (7.69%) CCNP Voice
Systems Management
1 7 (53.85%) Cisco Prime
2 1 (7.69%) Cisco CUCM
2 1 (7.69%) Cisco UCCX
Vendors
1 13 (100.00%) Cisco
2 7 (53.85%) SolarWinds
3 4 (30.77%) Citrix
3 4 (30.77%) Microsoft
4 2 (15.38%) Avaya
4 2 (15.38%) F5
4 2 (15.38%) Fortinet
4 2 (15.38%) Mitel
4 2 (15.38%) Siemens
5 1 (7.69%) Red Box