about GBIP and cable for GPIO

Hi all,

  I have an old device using GPIB (HP-IB 488) for data transfer, the bandwidth is not high. It is pretty slow to transfer big data. The device said it also support a high speed cable supporting GPIO port using HP 11738A cable. I try to search for that but I didn't see any cable of that model. Does anyone have any idea about 11738A and how fast could it be comparing to GPIB 488? Thanks.