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 during July 2008.

Latency
Brussels	5
Dublin	24	32
Frankfurt	7	11	30
London	8	16	17	15
Madrid	38	39	54	43	38
Milan	18	42	44	12	28	55
New York	81	83	85	83	70	110	96
Paris	17	20	39	11	17	53	21	89
Stockholm	29	32	52	23	36	65	33	115	32
Vienna	20	23	43	23	27	56	33	95	32	44
Washington	86	92	94	92	76	107	106	9	85	116	113
Zurich	15	38	39	8	23	51	19	91	17	30	29	101
	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.