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Ethernet Port Settings

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This information is in relation to our Etherway/Etherflow services.

Link speed

The Ethernet services are presented in different ways depending on the link speed you have requested.

1Gb/s (More common)

For 1Gbit/s bearers, the connection from the Openreach NTE to the customer equipment is presented using multimode mode fibre on LC connectors. A suitable SFP for the customer equipment would be a 550m MMF 850nm SX SFP and a length of multimode cable with LC connectors at each end. your router/switch would also need a SFP port. We can supply a suitable SFP and cable if you require.

The Openreach NTE does have a copper RJ45 port as well as an SFP port for connection to the customer router - however, the copper port is disabled by Openreach and the fibre port should be used.

This link should be used with an auto-negotiation port which is the default for gigabit links

In most cases, it is possible to replace the Openreach supplied SFP with something different, eg a DAC cable, this may light an error LED on the Openreach box though, and so cause confusion in the event of a fault. We'd also require that the Openreach supplied SFP is used in the event of a fault report.

The ONT requires power, and has two IEC sockets for resilience. eg, you can use a UPS on the 2nd power socket to power the unit in the event of mains power loss.

100Mb/s (Less common)

For 100Mbit/s links (and below) the service is presented using a normal Ethernet (copper) RJ45 connector. You use a normal cat-5 Ethernet patch lead to connect this to your switch, router or firewall as you required.

IMPORTANT the port on the Openreach supplied unit is sometimes configured as fixed full duplex. This means that if it is connected to an un-managed switch or un-configured port on a switch, router or firewall then it will not work correctly. It will seem to work, but as soon as any reasonable level of traffic flows there will be dropped packets seriously hindering upload speeds. You must have a managed switch or port connected to the link and configure the port to be fixed full duplex 100Mbit/s for it to work correctly. We can supply a small managed switch for this purpose if you require.

Cabling is a straight through cat5e patch lead to your managed switch.


For 10Gbit/s you will need special 10Gbit/s equipment, contact sales when ordering for details.


Normally the link you have can carry one or more services on the link - the common one being 10Mbit/s internet access. However the same link can have internet access and site-to-site access, and multiple such services and different speeds. We also offer a dedicated site-to-site fibre as well.

Where there is more than one service on the link then all of the services will have a VLAN tag. This is used to differentiate between the services. In this case site-to-site access can use Q-in-Q double tagging to pass VLAN tags to the other site. The internet access does not have any secondary VLAN tagging that would apply.

Where there is only one service on the link then this can be set to operate with no VLAN tag.

Where a dedicated site-to-site fibre is used then any packets simply go to the other end including any VLAN tags. This link is effectively a very long Ethernet cable, though still subject to packet size limits.

Note that if you have VLAN tagging on any link then all links on that connection will have a VLAN tag (you can't have one un-tagged). The VLAN tag could be any of the valid tag values so check your switch does not have a limited on VLAN tag values.

Packet size

Packet sizes up to 1548 are permitted on site-to-site traffic. Internet access is limited to 1500 bytes (plus VLAN tag where needed).

Technical details

See BT SIN 476 for technical details.