Our IP Performance WWW site contains the results of round-trip delay and loss measurements which we perform between key locations on our IP Backbone Network, and to key locations on the networks of our strategic partners. Several of the pages on this site are updated hourly and thus reflect the current state of our network; other pages are there to provide a more historical view of the performance of our core network.

The following tables contain the average PoP-to-PoP round-trip delay values (in ms) and percentage loss values between key nodes on the BT Global Services IP Backbone Network on 08 September 2010.

Latency
Brussels	4
Dublin	24	32
Frankfurt	7	11	34
London	7	16	17	14
Madrid	39	43	49	47	39
Milan	18	42	44	12	28	58
New York	75	83	85	82	70	99	96
Paris	19	21	28	11	10	58	21	81
Stockholm	30	33	52	24	36	69	34	111	33
Vienna	20	23	43	22	26	59	33	94	32	44
Washington	82	90	93	90	75	104	102	78	83	115	110
Zurich	14	37	38	8	22	54	18	90	17	30	29	99
	Am	Br	Du	Fr	Lo	Ma	Mi	NY	Pa	St	Vi	Wa

Packet Loss
Brussels	0.0
Dublin	0.0	0.0
Frankfurt	0.0	0.0	0.0
London	0.0	0.0	0.0	0.0
Madrid	0.0	0.0	0.0	0.0	0.0
Milan	0.0	0.0	0.0	0.0	0.0	0.0
New York	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Paris	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Stockholm	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Vienna	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Washington	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Zurich	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
	Am	Br	Du	Fr	Lo	Ma	Mi	NY	Pa	St	Vi	Wa

Detailed round-trip delay and loss statistics to/from a larger number of cities within Europe, North America, Asia Pacific, and Latin America are also available.

Notes
1) Each delay/loss value is colour-coded according to the acceptability of the result.
	Low delay/loss		High delay/loss
2) Further details of the measurements can be found by clicking on the "more information" button on the side navigation bar.