Equipment vendors shipped more IP-based DSLAMs than ATM-based ones in the second quarter, according to Dittberner Associates.

IP DSLAMs accounted for 57% of the world's DSLAM port shipments in the second quarter, Dittberner said, up from 49% in the first quarter and 38% in last year's second quarter.

VDSL is also growing, as carriers deploy IP video. Nearly 7% of the DSL ports shipped in the quarter were VDSL. That number was less than 6% in the first quarter and 5% last year.

DSL shipments overall were up 3% sequentially and 16% from a year earlier to 22.3 million, Dittberner said.

Alcatel, which introduced an IP DSLAM in 2004, maintained its leadership position with 30% of the market (measured in shipped ports). Huawei Technologies came in second with its highest-ever share of shipments, 20%. Siemens came in third with 7%. Ericsson, ZTE and Lucent Technologies all tied for fourth with 6%. And ECI Telecom, which introduced an IP DSLAM last September, followed with 5%.

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