14.3 MAU electrical specifications茂电气规格
This subclause defines the electrical characteristics of the MAU at the MDI and the AUI. The MAU shall also meet the AUI requirements specified in Clause 7 when the AUI is implemented.
本小节定义在 MDI 和用于茂的电气特征。茂也须满足中指定用于要求七条AUI 何时实施。 相对于一致性测试的其他信息是以B.4.3.
Additional information relative to conformance testing is given in B.4.3.
The ground for all common-mode tests is circuit PG, Protective Ground of the AUI. In implementations without an AUI, chassis ground is used as circuit PG. All components in test circuits shall be ±1% unless otherwise stated.
电路 PG，保护接地的用于的所有普通模式测试地面。在没有用于实现中，机箱接地用作电路页电路测试中的所有组件都须±1%，除非另有说明。
14.3.1 MAU-to-MDI interface characteristics MDI 茂界面特征 14.3.1.1 Isolation requirement分离的要求
A MAU that encompasses the PI of a PD within its MDI (see 33.1.3) shall provide isolation between all external conductors, including frame ground, and all MDI leads including those not used by 10BASE-T. A MAU that does not encompass the PI of a PD within its MDI shall provide isolation between the DTE Physical Layer circuits including frame ground and all MDI leads including those not used by 10BASE-T. This electrical separation shall withstand at least one of the following electrical strength tests.
包括其 MDI 内局部放电 PI 的茂 （见 33.1.3） 须提供包括地面框架，所有的外部导体之间的隔离和所有 MDI 都导致包括那些不使用 10BASE t。并不包括在其 MDI 内局部放电 PI 的茂须提供包括框架地面 DTE 物理层电路之间的隔离和所有 MDI 都导致包括那些不使用 10BASE t。这种电分离须承受以下电气强度测试中，至少一个。
a) 1500 V rms at 50 Hz to 60 Hz for 60 s, applied as specified in Section 5.3.2 of IEC 60950: 1991. b) 2250 Vdc for 60 s, applied as specified in Section 5.3.2 of IEC 60950: 1991.
c) A sequence of ten 2400 V impulses of alternating polarity, applied at intervals of not less than 1 s.
The shape of the impulses shall be 1.2/50 μs (1.2 μs virtual front time, 50 μs virtual time of half value), as defined in IEC 60060.
There shall be no insulation breakdown, as defined in Section 5.3.2 of IEC 60950: 1991, during the test. The resistance after the test shall be at least 2 M?, measured at 500 Vdc.
a) 1500 V rms 在 50 Hz 到 60 Hz 60 年代，作为指定应用 IEC 第 5.3.2 条 60950： 1991年。
b) 2250 Vdc 60 年代，作为指定应用 IEC 第 5.3.2 条 60950： 1991年。 c） 序列的十大 2400 V 脉冲交变极性，应用不小于 1 的时间间隔的 s。
须 1.2/50 脉冲的形状。Μs (1.2μs 虚拟前时间，50μs 虚拟时间的一半的值），所界定的 IEC 60060。 有须无绝缘击穿，测试过程中的 IEC 60950： 1991 年，第 5.3.2 条中所述。抗后测试须至少 2 米?，测量在 500 Vdc。
14.3.1.2 Transmitter specifications发射机技术指标
The MAU shall provide the Transmit function specified in 14.2.1.1 in accordance with the electrical specifications of this subclause.
茂须提供指定的传输功能14.2.1.1按照电气规格的这款。
Where a load is not specified, the transmitter shall meet requirements of this subclause when connected to a 100 ?resistive load. The use of 100 ?using 50 ? measurement equipment as 50 ?available.
terminations simplifies the measurement process when
impedance matching transformers are readily
to 100 ?负载不被指定，发射器须符合本小节，当连接到 100?阻性负载。使用 100?终止简化了测量过程时使用 50?测量设备，如 50?
Some tests in this subclause require the use of an equivalent circuit that models the distortion introduced by a simplex link segment. This twisted-pair model shall be constructed according to Figure 14–7 with component tolerances as follows: Resistors, ±1%; capacitors, ±5%; inductors, ±10%. Component tolerance specifications shall be met from 5.0 MHz to 15 MHz. For all measurements, the TD circuit shall be connected
through a balun to section 1 and the signal measured across a load connected to section 4 of the model. The balun shall not affect the peak differential output voltage specified in 14.3.1.2.1 by more than 1% when inserted between the 100 ?resistive load and the TD circuit.
100?阻抗匹配变压器一应俱全。
在本小节中的某些测试需要使用模型由一个单纯的链接部分介绍的失真的等效电路。这双绞模型的构造须根据图 14— —7与组件公差，如下所示： 电阻，±1%； 电容器，±5%； 电感器，±10%。组件公差规格须符合从 5.0 MHz 至 15 MHz。对于所有的测量，须连接 TD 电路
The insertion loss of the twisted-pair model when measured with a 100 ?source and 100 ?load shall
be between 9.70 dB and 10.45 dB at 10 MHz, and between 6.50 dB and 7.05 dB at 5 MHz.
通过双绞线第 1 及信号测量模型第 4 条连接的负载。双绞线，不会影响中指定的峰值差输出电压
14.3.1.2.1超过 10 之间插入时?阻性负载和运输署的电路。
双绞线模型测量 100 时的插入损耗?源和 100?负荷须与 9.70 至 10 mhz，10.45 分贝之间 6.50 至 7.05 分贝在 5 MHz。
Figure 14–7—Twisted-pair model双绞线模型
14.3.1.2.1 Differential output voltage差分输出电压
Some of the text and figures of this subclause describe the differential voltage in terms of magnitudes. These requirements apply to negative as well as positive pulses.
The peak differential voltage on the TD circuit when terminated with a 100 ?resistive load shall be between 2.2 V and 2.8 V for all data sequences. When the DO circuit is driven by an all-ones Manchester-encoded signal, any harmonic measured on the TD circuit shall be at least 27 dB below the fundamental.
一些文字和数字的本小节描述差动电压的幅度。这些要求适用于负面，以及积极的脉冲。
100 终止时的 TD 电路上的差动电压峰值?阻性负载须 2.2 之间 V 和 2.8 V 所有数据序列。当做电路由所有的曼彻斯特编码信号驱动的时任何测量对 TD 电路的谐波须至少 27 dB 以下根本。
NOTE—The specification on maximum spectral components is not intended to ensure compliance with regulations concerning RF emissions. The implementor should consider any applicable local, national, or international regulations.
Additional filtering of spectral components may therefore be necessary.
请注意—的规格最高的光谱成分为了确保 RF 排放法规的遵守。实现程序应考虑任何适用当地、 国家或国际规定。
其他筛选的光谱成分因此可能有必要。
The output signal Vo, is defined at the output of the twisted-pair model as shown in Figure 14–8. The TD transmitter shall provide equalization such that the output waveform shall fall within the template shown in Figure 14–9 for all data sequences. Voltage and time coordinates for inflection points on Figure 14–9 are given in Table 14–1. (Zero crossing points are different for external and internal MAUs. The zero crossings
depicted in Figure 14–9 apply to an external MAU.) The template voltage may be scaled by a factor of 0.9 to 1.1 but any scaling below 0.9 or above 1.1 shall not be allowed. The recommended measurement procedure is described in B.4.3.1. Time t = 0 on the template represents a zero crossing, with positive slope, of the output waveform. During this test the twisted-pair model shall be terminated in 100 ?and driven by a transmitter
with a Manchester-encoded pseudo-random sequence with a minimum repetition period of 511 bits.
输出信号 Vo双绞线模型中所示的输出定义图 14-8。TD 发射机须提供均衡，这样的输出波形须属于中所示的模板图 14— —9为所有数据序列。拐点的电压与时间坐标图 14— —9资料载于表 14–1。（零过境点是不同的内部和外部的玩家。零一过路处
所示图 14— —9适用于外部茂。)模板电压可通过扩展因子的 1.1 0.9，但任何缩放比例低于 0.9 以上 1.1 不得。推荐的测量过程所述B.4.3.1。时间 t = 0 模板代表零穿越，积极的斜坡，输出波形。此测试期间不得终止双绞线模型在 100?和驱动的发射器 与曼彻斯特编码的伪随机序列 511 位最低重复周期。
Figure 14–8—Differential output voltage test差输出电压测试
