agilent n4915a-005 serial bus switch data sheet version 1.1 6.5 gbit/s 2 to 1 switch for high speed differential signals low effect on signal integrity allows for usage in physical layer test setups fast switching time (6ns typical) manual and triggered operation supported by agilent n5990a test automation software no external power supply required ? ? ? ? ?
2 agilent n4915a-005 serial bus switch data sheet version 1.0 overview the n4915a-005 serial bus switch is designed for high speed serial bus applications, such as for example serial-ata and pci express. it can quickly switch between one source and two sink devices or one sink and two sources while having a minimal effect on signal integrity. serial bus interface the switch is designed for switching a differential signal as typically used in high speed serial bus applications. therefore the switch comes with two channels that switch simultaneously. figure 1 illustrates a typical setup with two trans- mitters that are switched between one receiver. analogously two receivers can be switched between one transmitting device. figure 1: typical switch setup with two transmitters for both channels the common connector (labeled ?c?) will be switched between connector ?1? and ?2?. the switch position display will indicate the current switch state by either illuminating a red (connector 1) or a green (connector 2) led. power supply the switch doesn?t require any power supply, it operates solely on usb power via its back side mini usb connector. it interfaces to any standard usb host, as provided by many agilent instruments or by any standard pc. it doesn?t require any host soft- ware or driver installation. the switch doesn?t have a dedicated power indica- tor. as soon as one of the switch position and one of the trigger mode leds are illuminated the switch is powered and in normal operation. parameter value note max. usable data rate 6.5 gbit/s signal inputs/outputs ac coupled 100 nf at each connector max. signal amplitude per channel 1v @ 70 khz to 12 ghz 2v @ 100 mhz to 12 ghz max. signal amplitude two channels differential 2v @ 70 khz to 12 ghz 4v @ 100 mhz to 12 ghz signal attenuation 1.5 db (15%) typical at 6 gbit/s transition times (20%-80%) 40 ps typical when used with j-bert n4903a switching time 6 ns typical total jitter (p-p) 20 ps typical 1) skew between channels 2 ps typical connectors sma, 3.5 mm female power supply usb 1) total jitter was measured with j-bert n4903a and 86100c dca-j with precision time-base using the following settings: ber 10 -12 , data rate 3 gbit/s, pattern 2 15 -1 prbs table 1: n4915a-005 electrical characteristics figure 2: n4915a-005 connector view
agilent n4915a-005 serial bus switch data sheet version 1.0 3 operation modes the switch is controlled by four buttons on the front panel. its current operation mode and switch position are illustrated by front panel leds. both trigger modes make use of the trigger input. the trigger mode buttons allow the user to switch between a level static trigger mode and an edge trig- ger mode. in edge trigger mode the manual pre-set buttons are also active. as an edge trigger toggles between the two switch positions the pre-set func- tion allows the switch to initialize at a desired state. for a manual only operation the edge/man trigger mode will be used and the trigger input will remain open. figure 3: n4915a-005 front view with status leds trigger input the trigger input is designed to be interoperable with agilent bit error ratio testers such as the j-bert n4903a as well as agilent pulse pattern generators such as the 81134a. for usage with j-bert?s trigger output choose the edge trigger mode. when connecting to the output of a pulse pattern generator the level static mode can be used. table 2: n4915a-005 trigger input electrical parameters parameter value trigger input max. levels 3v trigger threshold 10 mv max. trigger rate 10 mhz trigger input connector sma, 3.5 mm female usage in test automation and serial-ata receiver compliance test because of its external trigger modes the switch can be controlled by other test equipment. test equip- ment with integrated sequencing capabilities, such as the j-bert n4903a can control the switch posi- tion as part of a pattern sequence. furthermore, setups with multiple channels, such as the 81134a pulse pattern generator or the parbert 81250 systems can dedicate a data channel to control the switch. some test applications require the user to change cables between tools, for example in serial-ata receiver compliance testing, different tools are needed for turning on the test mode and for per- forming the actual test. without a serial bus switch this requires a change of cables as part of the test procedure. changing cables is certainly undesired in test au- tomation as it consumes additional time and labor. in order to avoid connectivity errors and preserve mechanically sensitive test ? xtures, setup changes should also be avoided. therefore in serial-ata the n5990a test automa- tion software has capabilities to remotely control two switch devices to avoid manual steps. besides test automation in serial-ata the switches also overcome the device disconnect issue: after the test mode is turned on on a serial-ata product, it doesn?t necessarily allow the user to manually change the connectors. being disconnected causes some devices to return to the out-of-band mode. such products can still be tested when using the serial bus switch. because of the fast switching time serial-ata products won?t detect a signal loss while being switched between test tools. ordering information 6.5 gbit/s 2 to 1 serial bus switch n4915a-005
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