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 October 2008.

Latency
Brussels	4
Dublin	23	32
Frankfurt	7	11	30
London	7	16	17	14
Madrid	38	40	53	43	38
Milan	18	42	44	12	28	54
New York	77	85	86	84	73	102	98
Paris	17	20	39	11	19	53	21	90
Stockholm	28	31	51	23	35	64	33	107	32
Vienna	20	23	42	23	27	56	33	97	32	44
Washington	83	91	92	92	76	105	103	63	85	116	111
Zurich	15	37	38	8	23	50	19	93	17	30	29	100
	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.