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Compared to the problems encountered with serial and asynchronous interfaces, troubleshooting the setup of Cisco Ethernet interfaces is simple The most common problems on Ethernet interfaces have nothing to do with how the router is set up; rather, the problems typically involve overutilization of bandwidth, a high number of collisions, or systems using incompatible frame types Collisions, drops, utilization (as reported by throughput), and frame type are reported on the show interface ethernet 0 command as illustrated in Fig 8-2 Other problems, such as LAN card drivers incorrectly forming frames that are either too long (giants) or too short (runts), are rare these days The major challenges of implementing Ethernet networks are in the areas of physical design and management of cabling systems We will review how Cisco IOS screen displays report typical Ethernet problems Once the Ethernet interface and line protocol report an up condition, which is achieved by connecting the Ethernet interface to a hub, little optimization can be achieved through interface configuration The most significant factor in serial line performance problems we examined was with packet drops You rarely see drops on an Ethernet interface, even on a heavily utilized segment The only time drops are likely to become a factor is when you have a router connecting a heavily utilized FDDI ring and an Ethernet segment The FDDI ring operates at a much higher rate than the Ethernet and may overwhelm the Ethernet interface with packets that need to be switched onto the Ethernet segment If this happens in your internetwork, the same steps used in optimizing a serial interface, ie, of disabling fast switching by use of the no ip route-cache command on the Ethernet interface, and adjusting buffers and hold queues, might help In most cases, drops on an Ethernet interface are rare This is due in part to the way Ethernet operates Any node at any time can transmit on the LAN cable as long as no other node is using the cable Therefore packets are stored in a router for a relatively short period of time before being switched out an Ethernet interface and do not get held in buffers or hold queues On an Ethernet interface, congestion normally displays itself through packet collisions after the packets have been transmitted out of an interface Collisions occur when two interfaces try to transmit a packet onto the network cable at the same time A small number of collisions is expected in an Ethernet network, but the obvious question is what constitutes "a small number" That is different for each network; if you see a collision more than once every 3 to 5 seconds, you should investigate the source The source of collisions usually is the result of cabling that is too long, overly high utilization, or what is commonly referred to as a deaf node, one that has faulty circuitry that keeps it from hearing other nodes using the network cable Again, we have the question of what utilization is too high Again the answer is that it is different for every network If your network has a high percentage of broadcast packets, the utilization at which performance starts to degrade will be lower than for a network with few broadcasts Typically, if the network utilization reaches 40 percent, you can expect problems The way you detect utilization on a Cisco router is by the throughput on the interface This statistic as reported by the 5-minute average is not particularly useful, as short peaks in utilization are not reported If your router is reporting excessive collisions for any reason, you are better off using a LAN analyzer to determine if utilization is the cause of the problem Out-of-specification cabling causes more collisions because a node will listen to the network cable f i d f i b f d i i h h d i i i Th f h h.

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signals Quadrature modulators have only recently become popular, after they were integrated onto a single low-cost chip These devices solve the problem of imparting complex amplitude/phase information onto an RF or IF carrier Any part of a signal s parameters can be modified by the quadrature modulator phase, frequency, and/or amplitude thus can add information to an unmodulated carrier Simply employing a single mixer for this role would be unacceptable, since only one parameter (such as phase for a BPSK signal) could be modified at a time, making an efficient digital modulation scheme infeasible Figure 236 shows a quadrature modular for digital signals that is capable of varying two of the three modulation parameters; typically, phase and/or amplitude are chosen to generate BPSK, QPSK, or QAM Many quadrature modulators are also proficient at generating AM, FM, CDMA, and SSB The I/Q modulator shown will accept data at its I/Q inputs, modulate it, and then upconvert the baseband to hundreds of megahertz There are some specialized I/Q modulators that are actually capable of functioning into the gigahertz range Many will also be fed by DACs into their I/Q inputs (Fig 237) The digital data is placed at the input to the DAC, which outputs in-phase (I) and quadrature (Q) baseband signals into the I/Q modulator inputs The I modulating signal enters the I input, where it is mixed with the LO, which converts it to RF or IF The Q modulating signal enters the Q input, where it is mixed with the 90 degree phase shifted LO signal, which converts it to RF or IF Both of these signals are then linearly added in the combiner, with each mixer outputting a two-phase state BPSK, which (depending on the bits entering the modulator) will be in any one of four phase states This combining of the two BPSK signals produces QPSK, which is shown in the time domain in Fig 238 Since each mixer s output is 90 degree phase shifted from the other, the algebraic summing of the combiner creates a single phase out of four possible phase states In other words, the incoming baseband signals to be modulated are mixed with orthogonal carriers (90 degrees), and thus will not interfere with each other And when the I and Q signals are summed in the combiner, they become a complex signal, with both signals independent and distinct from each other This complex signal is later effortlessly separated at the receiver into its individual I and Q components all without the amplitude and phase constituents causing cointerference Now, the quadrature demodulator will take the incoming RF or IF signal, demodulate it, and then down-convert the signal s I/Q outputs into baseband for further processing by digital logic circuits An I/Q demodulator (Fig 239) performs the reverse of operation of the I/Q modulator above It accepts the amplified and filtered RF or IF modulated signal in this case QPSK from the receiver s front end or IF section The demodulator then recovers the signal s carrier (which can be employed as the LO to maintain the original phase information from the transmitter), splits it, and inserts it in phase into mixer 1 and out of phase into mixer 2 A baseband signal in I/Q format is then output at IOUT and QOUT of the demodulator for processing.

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