![Sangoma 601 RS232 back-to-back null-modem cable for 502 and 503 cards Sangoma 601 RS232 back-to-back null-modem cable for 502 and 503 cards](https://cdn11.bigcommerce.com/s-u3uxlvxq3h/images/stencil/400x400/products/4959/22310/CABL-601-2__20220.1584429644.jpg?c=1)
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The Sangoma 610 cable is a V.35 back-to-back cable for connecting Sangoma S503/508 and S5142 cards. The Sangoma 610 is 10' long.