标准介绍：【TBR 015-1996 商务电讯（ BTC ） - 普通及特殊品质的语音带宽的2线模拟租用线（ A20和A2S ）】Defines the attachment requirements and correspondingtest principles for a terminal equipment interface intended for connection to the network termination points of Open Network Provision (ONP) ordinary quality or special quality voice bandwidth 2-wire analogue leased lines defined by ETS 300 448 and ETS 300 449.
TBR 015-1996 商务电讯（ BTC ） - 普通及特殊品质的语音带宽的2线模拟租用线（ A20和A2S ）
