In this case, operators may prefer (or be forced) to rely on existing (possibly upgraded) metallic test access unit (MTAU) equipment to obtain a first estimate of data rate capability to a customer.
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美
- 此時(shí)，運營(yíng)商可能寧愿（或者是被迫）通過(guò)已有的（可能是升級過(guò)的）銅線(xiàn)測試接入單元（MTAU）設備來(lái)得到用戶(hù)數據速率能力的初次估計。
