T1 FOR VOICE AND DATA This topic has 1 reply, 1 voice, and was last updated 20 years, 7 months ago by Marshall. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts 24th June 2002 at 20:10 #21795 BillGuest Are there different types of T1 for VOICE or DATA ?? 10th July 2002 at 20:40 #21796 MarshallGuest There are differenct types of T1. Depending on type of Voice and data. All T1 is 1.544Mbps but the payload changes depending on signalling. T1 with ESF B8ZS will deliver anything. and has 1.536Mbps payload or if it is ISDN 23 X 64Kbps is 1.472Mbps. T1 with SF ZCS will deliver old E&M voice and data in 56Kbps per 24 DS0s. The payload is 1.344 Mbps. ISDN will not work. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) The forum ‘Voice over IP’ is closed to new topics and replies.