These minimum standards have been endorsed by the Joint Infrastructure Group and will be reviewed on an annual basis. Any queries should be addressed to the Wireless Team at wireless-infrastructure@cam.ac.uk.
Why do we need standards?
The University Wireless Service has set minimum standards for network connectivity to wireless access points that are hosted on institutional networks. Adopting these standards will help facilitate high-quality services and a greater degree of standardisation across the Collegiate University. Institutions' inability to meet these standards, may cause degraded performance of wireless equipment. This will result in reduced support provision from the Wireless Service.
We recognise that adopting these standards will need time to implement and we do not expect institutions to adopt these standards straightaway. However, when considering equipment replacement as part of a sensible product lifecycle, or building refurbishments, these standards should be implemented for full Wireless Service support.
What are the standards
Minimum network requirements
The following requirements are the minimum supported standards for University Wireless to operate on institutional networks that are not operated by Information Services.
Switch edge ports are 1Gb/s
Switch port connections to Wireless Service access points at the edge should have a minimum speed of 1 Gbps.
Support 802.3at / POE+ switch power
Switches should be able to provide minimum 802.3at / POE+ to access points to facilitate full functionality of the access point.
Support LLDP for enhanced power management
Link Layer Discovery Protocol should be enabled to facilitate access points to negotiate the correct power allocation from the switch.
Appropriately sized switch backhauls to the UDN connection
Where the connection to the UDN is 10Gbps or greater, we recommend 10Gbps uplinks from edge switches to the network for greater wireless traffic throughput.
Network configured for Spanning Tree Protocol
Configuration of Spanning Tree is required to facilitate loop detection and avoid any mistakes in cabling and configuration and it can also detect loops through multiple switches. Rapid-PVST+ Spanning Tree is used by the UDN, and it (or the equivalent) is strongly recommended for institutions which have a layer 2 connection with the UDN (such as through a PoP switch), to allow loops involving both networks to be detected. It also provides the best supporting configuration for wireless access points.
Regardless of the protocol, it should be configured according to best practice, with suitable edge port configuration for access points and a stable topology.
General network configuration
Network configuration for wireless access points must be configured in line with the guidance published on the access point support networking pages at:
https://help.uis.cam.ac.uk/service/wifi/it-staff/wireless-technical-implementation/access-point-support-networking
New cabling installations to support access points
Minimum Cat6a cabling
Cat6a should be the minimum used when installing new cabling. As most of any new cabling installation cost is the labour charge, it is recommended a ‘more than is needed’ approach is taken during installation. This will facilitate future flexibility and reduce unforeseen expenditure at a later date. The current trend for wireless deployments is for a greater density of access points. This is due to the increasing use of higher frequencies that do not propagate as well. This will also result in increased cabling requirements.
Two network points per access point
Two ethernet connections should be installed per access point location to support either LACP for high-capacity AP throughput requirements or network redundancy, or both. High-capacity access points should have 2 ethernet connections for higher power requirements, unless using Smart Rate or mGig connections. Higher capacity access points can exceed 1Gbps throughput. They also require 802.11at (POE+) power on 2 connections or 802.1bz (POE++) power on a single connection.
Further recommendations for hosting access points
Below are additional recommendations when hosting Wireless Service access points. In the future, these recommendations will also become the minimum requirements for University Wireless.
- Switch edge ports are 802.3bz compliant. For example, Aruba Smart Rate or Cisco mGig switch edge ports.
- Support 802.3bt/POE++ switch power for high-capacity access points.
- 10Gbps uplinks from edge switches.
- 10Gbps connection to the UDN.