3Com SuperStack II 3C16987 manual

® http://www.3com.com/ Super Sta ck ® II Switch 330 0 SM User Guide 3C1698 7 Part N o. DU A1698 -7AAA01 Publ i sh e d May 2000[...]

3C om Corporatio n 54 00 Bayfr ont Pl aza Sa nta Clara, Calif ornia 95 052-8145 Copy right © 20 00, 3Co m T echnolog ies. Al l rights reserve d. No part of this docume ntat ion may be reproduced in any for m or by any me a ns or us ed to make any deriva tive wor k (such as tran slation , transf orma tion, o r adapta tion) w ithou t writt en permi [...]

C ONTENT S A BOU T T HIS G UID E Conventions 8 Related Doc umentation 9 Y ear 2 000 C ompli ance 10 Documenta tion C o mments 10 Product Registration 10 1 I NTR ODUC ING TH E S WITCH 3300 SM About the SuperStack II Switch 3300 SM 12 Summary of F eatu re s 12 Switch 33 00 S M — Fr o nt View D e tail 13 10BASE -T/100BASE -TX Ports 13 1000B ASE-SX P[...]

2 I NSTALLING THE S WITCH Choosin g a Suitable S ite 24 Rack-mounting 2 4 Placing Units On T op of Each Other 25 St acking U n its 26 St acking T wo Units 2 6 St acking Up T o Four Units 27 The Pow er -up Sequ ence 29 Connectin g a Redundant P ow er System 29 Powering-up the Sw itch 3300 SM 29 Checki ng for Corr ect Op erat ion 29 Choosin g the Cor[...]

Support from 3C om 48 Return ing Produc ts for R epair 5 0 G LOSSARY I NDEX 3C OM C ORPORA TION L IM IT ED W ARRANTY EMC S TATEMENTS[...]

[...]

A BOUT T HI S G UI DE This g uide pr ovid es all the in for mation you need to i nstall and use a Supe rS tack ® I I Swit ch 330 0 SM (3C 169 87) uni t w ith d efaul t se ttings. If yo u wa nt t o ch ange the wa y th e Switch w or ks using ma nage m ent soft ware, ref er to th e “ SuperSta c k II Switch Management G uide ” . The gu id e is int[...]

8 A BO UT T HIS G UI D E Con ventions Ta b l e 1 and Ta b l e 2 list c onventi o ns th at ar e used thr oughout th is guide. Ta b l e 1 N otice Ic ons Ic on Notice Type Descri ption In fo rmat ion n o te In fo rmat ion t hat d escri bes i mpor ta nt fe atu res o r ins tr uct io n s Cauti on Informat ion th at ale r ts y ou to pot enti al loss of da[...]

Relat ed Documenta tion 9 Related Do cum en tatio n I n addition to this guide, eac h Switch 3 300 SM document set in clu des the fo ll ow i ng : ■ Ma nageme n t Gui de This gu ide con tai ns all the mana gem e nt in form ation for t he S wi tch. ■ Qui ck Refe rence Guide This g uide cont ains a quic k summary of the har dwar e and soft w ar e [...]

10 A BO UT T HIS G UI D E In addi tio n, the re are ot her publi cat ions y ou may f ind u se ful: ■ Doc umen tat ion a ccom pa ny ing t he A d vanc ed Re du ndan t Po w er System . Y ear 200 0 Com pliance Fo r inf or mat ion on Y e ar 20 00 com plian ce and 3C o m p r o duc ts, vi sit t he 3Co m Y ea r 2000 Web page : ht tp :/ /w ww. 3c om .c om[...]

1 I NTR ODUCING THE S WITCH 3300 SM This c h apter c o ntai ns intr oductory i nformatio n about the Swit c h and how it ca n be u se d in y our net wor k. I t cov ers t he f ollo win g topic s : ■ Abo ut the Supe r Stack II Sw itch 33 00 SM ■ Sw itch 33 00 SM — Fr ont Vi ew Det ail ■ Sw itch 33 00 SM — Rear View Detail ■ Netwo rk C onf[...]

12 C HAPTER 1: I NTRODUCING THE S WITCH 3300 SM Ab out t he Su per S ta ck II S witc h 3300 SM The Supe rStack ® II Sw itch 330 0 SM conn ec ts : ■ yo ur exi sting 10Mb ps de v ices. ■ high-pe rfo rm ance w o rkgroups w it h a 1 00M bp s or 10 00M bp s backb one o r ser ver co nnect ion. ■ user s to dedi cat ed 1 00M bp s po rts in on e swit[...]

S w it ch 3300 SM — Front View Detail 13 S witc h 3 300 SM — Fr ont View Detai l Figure 1 Switch 3300 SM — fr ont view 10 BA SE- T/ 10 0BAS E- TX P orts The Swit ch has 24 au to-neg otiat ing 10BASE- T/100BASE- TX ports conf igure d as M DIX (cr o ss- over). The se ports can be set to 10BASE-T half dup lex, 10 BAS E- T full du ple x, 100B A S[...]

14 C HAPTER 1: I NTRODUCING THE S WITCH 3300 SM Ta b l e 3 LED behavior LED Color In dic ates Port S tatus LEDs Pac ket Ye llo w Packet s are bei ng tra nsmitt ed/re ceive d on the por t. Off No pack ets are be ing t r an smitt ed/recei ved o n the port. Statu s Green A li nk is present , an d the por t is enable d. Green fl ashi ng A li nk is pres[...]

Switc h 3300 SM — Rear View Detail 15 S witc h 3 300 SM — Re ar V ie w D e ta il Figure 2 Switch 3300 SM — r ear vi ew Unit In fo rm atio n Label This la bel shows the following : ■ The 3C om p roduct name o f t he Sw itc h ■ The 3Com 3C n umber of the Swit ch ■ The uni q ue MAC address (Et hernet addr ess) of th e Switch ■ The ser ia[...]

16 C HAPTER 1: I NTRODUCING THE S WITCH 3300 SM C onsol e Port T h e c o n s ol e p o rt al l ow s yo u to co nn ec t a te r mi n al an d p e rf or m rem o t e or local ou t-of -ban d m anage men t. Th e con sole port uses sta ndard n ull mo dem c abl e and i s set to a uto- baud, 8 d ata bit s, no parit y an d 1 stop bit. M atrix Po rt The Matrix [...]

Network Conf igurati on Exam ples 17 Net work Con figuration E xamp les The f o llowi ng il lustra tions show s ome example s of how the Swit ch can be u se d in y our net wor k. Switch 3 300 SM a s a Segm en tati on S wi tch The ex ample in Fi gur e 3 shows how a Switc h 3300 SM stack can s egment a network of shared 10Mb ps ,100M bp s and 100 0M [...]

18 C HAPTER 1: I NTRODUCING THE S WITCH 3300 SM Switch 3 300 SM a s a Co llaps ed Back bon e Sw itc h The ex ample in Figu re 4 shows ho w a Swi tch 33 00 SM stack can a ct as a backb one for bo th shared and sw itch ed ne tw ork segme n ts. Figure 4 U sing t he Swit ch as a collaps ed backbone Switch 3300 SM stack Endstations on switched 10Mbps co[...]

Network Conf igurati on Exam ples 19 Switch 3 300 SM a s a D esk top S wi t ch The ex ample in Figu re 5 shows how a S witch 330 0 S M can be u s ed, within a stack, fo r a g roup of use rs that require dedi cate d 1 0Mbp s or 100Mbps connec ti ons to th e deskto p. The 3300 SM Switches pr o vide a Gigab it Eth er net co nne c tion to a Supe rS tac[...]

20 C HAPTER 1: I NTRODUCING THE S WITCH 3300 SM Con figuration Rules fo r F ast Et h er n e t The t opo logy r ules f or 100 Mbps F ast Et her n et are sl ightly different to those for 10 Mbps E the rn e t. Fi gure 6 il lustr ates the key topolo gy rules an d pr ovides exam ples of how they a llow for lar g e-s cale F ast Et hernet net works. Figur[...]

Config ur ati on Rules with Full Dupl ex 21 The key topolog y rules are: ■ Ma ximum U TP c ab le leng th is 100 m (3 28ft) ov er Ca te gory 5 ca b le. ■ A 412 m (135 2ft) fib er run is al lowe d for con nect ing swi tch-to- swi tch, or e ndsta tion -to-sw itch , usin g ha lf-du pl ex 10 0BA SE- FX. ■ A tot al n etwor k span of 325 m (1 066 ft[...]

22 C HAPTER 1: I NTRODUCING THE S WITCH 3300 SM Con figuration Rules fo r G ig ab it Eth e r n et Gigab it E the rne t i s desi gned to run ov e r fou r m edia : ■ Singl e-m ode f ibe r opt ic ca b le, w ith c onn ect ions up to 5km . ■ Mul timo de f ibe r optic ca ble , wit h c onnec tion s up to 550 m. ■ Bala nced, shi eld ed c opp er c abl[...]

2 I NSTALLI NG TH E S WITCH This ch apter co ntain s th e in form ation y ou ne ed t o inst all an d se t up t he Swi tch. It covers th e foll owing to pics: ■ Choosing a Su itable Si te ■ Rack- mo unt ing ■ Plac ing Un its O n T o p of E ach Ot her ■ Stack ing Units ■ The Power -up Se quence ■ Choosing the Corr ec t Cables ■ Solving [...]

24 C HAPTER 2: I NSTALLING THE S W ITCH Cho osing a S uitable Si te The Swit ch is suite d for use in an offi ce envir o nment wher e it can be mo unte d in a st anda rd 19- inch e quipm e nt rack , or free st andi ng. Alter n ative ly , th e S wi tch ca n be rack-m ount ed in a wiring close t or equipm e nt r o om . A ra ck- mou ntin g ki t, con t[...]

Plac i n g Unit s On Top of Each Othe r 25 Figure 7 Fitting a brac ket for rac k mounti ng 3 In se rt t h e tw o s cre w s a n d t ig h te n w i th a s ui ta b le s c rew d ri ve r . Y ou must use t he sc rews suppl ied w ith the mo unting b rac kets . Dam a ge caused to th e uni t by using in correc t screws inval ida tes your w arra nty . 4 Repea[...]

26 C HAPTER 2: I NSTALLING THE S W ITCH Sta c ki ng Un i ts Unit s in th e S witch 11 00/3 300 fam ily can b e stac ked toge the r an d the n tr eated as a sing le mana geable unit wi th one IP addr ess . The Mat rix Port o n the rear of the S w i tch allo ws you to conn ect two Switch units back -to- bac k. For this y ou nee d a M atr ix Ca ble (p[...]

Stack ing Un its 27 Figure 8 A stack of two uni ts Stack ing Up T o F our Unit s Y o u c a n sta ck up to four Sw itch unit s using a Sw itch 33 00 MM and t he appr opriate number of Matrix Cables. Y ou ne ed on ly on e Supe rS tack I I S witc h 33 00 MM p e r stack . T o stac k up to fou r Switch u n its: 1 Po w e r - off a l l th e un it s . 2 Ar[...]

28 C HAPTER 2: I NSTALLING THE S W ITCH 4 If you u se the mana g ement softwa re of t he un its: ■ Ensure tha t all t he un its ha v e the same ver sion o f m ana gem ent software ■ Ensu re that yo u re -configur e the stack- wide featu res on all the unit s Fo r m ore i nfo rm a ti o n a bo u t m a na ge m e n t s o ft w a re, s e e “ Ma nag[...]

T he Power-up Sequen ce 29 Th e Pow e r -u p Se qu en c e T he f ollow ing se cti ons descr ibe how to get you r Swi tch 330 0 S M p owered- up a nd ready for o perat ion. Co nnect ing a Redund a n t P ower Syst em Y o u c a n co nnec t a Su perSt ack II A dv anced Redu ndant P ower S ystem (par t numb er 3C 1607 1A ) to t he Sw itc h. This unit, w[...]

30 C HAPTER 2: I NSTALLING THE S W ITCH I f ther e is evid ence of a pr oblem, see “ Solv ing Prob lems In dicated by LED s ” on page 31 . Cho osing t he C or r ect Cabl es All of the por ts o n t he f ront of the Sw itch 33 00 SM are co nfig ured as MDIX (c ro ss-o ver) . If y ou want to m ake a connecti o n to an o the r MDIX port , yo u nee [...]

Solvi ng Probl ems Indi cated by LE Ds 31 Solving Problems Indicated by LEDs If the LEDs on t he Swit ch indi cat e a pr oblem , r ef er to Ta b l e 6 which co ntains a list of problem s a nd su ggest ed solu tions. Fo r infor mat ion a b out sol v ing pro blem s wh en man agi ng the Swit ch, refer to the Prob lem Solving c hapter i n the “ Super[...]

32 C HAPTER 2: I NSTALLING THE S W ITCH Ma naging the Sw it ch The S witch contai n s sof tware that allows you t o change and mon itor the way it wo rk s. This mana geme nt s oft wa re is not requi red to g e t the Sw itch wor kin g, b ut if y ou d o us e it , you m ay i mp rove t he e fficienc y o f the Swi t ch and ther efor e i mprove the overa[...]

A S AFETY I N FORMA TION Y o u m ust read the followi ng safet y infor ma tio n b efore carr ying out any install ation or r e m ov al of c omp onen ts, or an y m ain tenan ce pro cedures on the Swit ch 330 0 SM . WARN ING : W arn ings co nt ain direc tion s th at you m ust f ollow fo r your person al safety . Follow all dir ec tio ns carefully . Y[...]

34 A PPENDIX A: S AFETY I NFORM ATION Impor tant S afety In form atio n ■ Install ation and remo va l of the un it mu st be car ried o ut by qual ified per sonn el o nly . ■ I f install ing the Switch u nit in a stack wit h SuperStac k II Hub units, t he Switch 33 00 S M unit m ust be inst alled b elo w th e H u b unit s. ■ The un it sho uld [...]

Imp o r tan t S a fe t y Info rm at ion 35 ■ Franc e an d Peru onl y: This un it can not be p o wered from IT † su pplies. If y our supplies ar e o f I T type, this unit m ust be po wered by 230V (2P+T) v ia an isolati o n transf orme r rat io 1:1 , w ith the secon dary co nnec tion point la belled Neut ral, c onn ected di rectly to e arth (g r[...]

36 A PPENDIX A: S AFETY I NFORM ATION L ’ inform at ion de S é cu rit é Impor tante ■ L' install ation et la d é po se de ce gr oup e do iv en t ê tre c on f i é s à un per sonn el q ualifi é . ■ Si vo us enta ssez l'u nit é Swi tch avec l es unit é s Supe rSta ck I I Hub, l'unit é Sw itch 330 0 S M do it ê tr e inst[...]

L ’ inf orm ati o n d e S é cur it é Impo r tan te 37 ■ L ’ app areil fonct ionn e à une t ension e xtr ê m ement basse de s é curi t é qui es t co nf orme à la no rme CEI 950 . Ces c ond itions n e sont maintenue s q ue si l' é quipem e nt auquel il est racc ord é fonc ti onne dans les m ê mes c ond itions. ■ Fra nce et P é[...]

38 A PPENDIX A: S AFETY I NFORM ATION Wi ch tige Siche rheits informa t ion en ■ Die In stallation und der A usbau des G er ä ts darf nur dur ch Fach pe rs onal erfol ge n . ■ Wenn di e S witc h 33 00 SM E i nh eit i n eine r S tapel m it ande ren SuperSt ack II Hub Einheit en eingebau t wer den soll , mu ß die Swi tch 330 0 SM Ei nheit unt e[...]

Wi chti ge Sicherhei tsinfo rmatio nen 39 WARN HIN W EIS : F ase r o ptik an sc hl ü s se - O ptisc he Sic herhe it. Niemals mi t eine m V e rgr öß erun gsge r ä t ei nen Ü ber tragung s-L aser betr achten, w ä hr end dieser eingeschal tet ist. Nie m al s direkt auf den Fa s er Anschlu ß und auf die Faser kabelende n schauen, w ä hrend dies[...]

40 A PPENDIX A: S AFETY I NFORM ATION[...]

B P IN - OU TS Nu ll Modem Ca ble 9-pi n to R S-23 2 25 -p in P C-A T Seri al Cab le 9-pi n to 9 -pin Screen TxD RxD Ground RTS CTS DSR DCD DTR Screen RxD TxD Ground RTS DTR CTS DSR DCD Shell 3 2 5 7 8 6 1 4 1 3 2 7 4 20 5 6 8 Switch 3300 SM Cable connector : 9-pi n female PC/T erminal Cable connector : 25-pi n male/female only required if screen a[...]

42 A PPENDIX B: P IN - OUT S Mode m Ca ble 9-pi n to R S-23 2 25 -p in RJ45 P in As signme nt s Pi n assignme nts ar e identic al for 10BASE-T an d 100BASE- TX RJ45 co nnect or s Screen TxD RxD RTS CTS DSR Ground DCD DTR Screen TxD RxD RTS CTS DSR Ground DCD DTR Shell 3 2 7 8 6 5 1 4 1 2 3 4 5 6 7 8 20 Switch 3300 SM Cable connector : 9-pi n female[...]

RJ45 P in Ass ignment s 43 Ports conf igured as MDI X 1 RxD ata + Rece ive Data 2 RxData – Rece ive Data 3 TxDa ta + Tra nsmi t data 4 Not as signe d 5 Not as signe d 6 TxDa ta – Tra nsmit dat a 7 Not as signe d 8 Not as signe d Ta b l e 7 Pin assignment s Pin Num ber Signal Funct ion[...]

44 A PPENDIX B: P IN - OUT S[...]

C T ECHNI CAL S PECIFICATIONS Physic al Dimensio ns He ight: 43.6mm x Width: 440mm x Depth: 247.5 mm Wei ght: 5kg (11lbs) Envir onmental Requir ements Oper ating Temp era ture 0 ° to 5 0 ° C (32 ° to 122 ° F) Stora ge Temper ature – 10 ° to +7 0 ° C (14 ° to 158 ° F) Oper ating Humidi ty 10 – 95% rel ativ e humid ity, n on-conde nsing S[...]

46 A PPENDIX C: T ECHNICAL S PECIFICATIONS Standar ds Support ed SN MP SN MP pr otocol (RFC 11 57) MI B-II ( RFC 121 3) Bri dge MIB (RFC 1493) Re peater MIB (RF C 1516) VLAN M IB ( RFC 15 73) RMON MIB (R FC 1271) BOOTP ( RFC 95 1) T ermi nal Em ulati on Te lnet ( RFC 854) Pr otocol s Use d for Administ ration UDP ( RFC 768) IP (R FC 791) ICM P (RF [...]

D T ECHNI CAL S UPPO RT 3Co m p r o vides ea sy ac cess t o t echn i cal supp or t inf orm at ion t hrough a vari ety of serv ices. This ap pendi x descr ibes th ese serv ices. Inf ormation co ntained in th is appendi x is co rre ct at time o f publ icatio n. For the mos t r ece nt i nformation, 3 Com reco mmends tha t you a ccess the 3Com Cor pora[...]

48 A PPENDIX D: T ECHNICAL S UPPORT 3Co m F TP S i te Down lo ad drivers, p atches, s oftware, and MIBs across the Inter net from the 3Co m public F TP site . This service is available 2 4 hours a day , 7 days a week. T o con nect t o the 3Co m F TP site, ente r the foll o wing info rmation in to yo ur F T P clie nt: ■ Hostname: ft p. 3c om .c om[...]

Suppo rt f rom 3Com 49 When you co nt act 3Com f or assistance , have the fol low ing inf or mat ion read y: ■ Pr o duc t mod el n ame , p art num be r , and s eria l numb er ■ A l i st o f sy ste m ha rdw a re a nd so ft wa re , i n cl ud in g re vi s io n l e v el s ■ Diagno stic error me ssages ■ Detai ls a bou t recen t conf igur ation [...]

50 A PPENDIX D: T ECHNICAL S UPPORT Retu rni ng P roducts fo r R ep ai r Bef ore you send a product direct ly to 3Co m f or repa ir , y ou must f irst obta in an a u thoriz ation n um ber . Produc ts sen t to 3 Com w itho ut aut horiza tion num ber s w ill be r et urn e d to t he se nd er u nopen e d, at the sender ’ s ex pense . T o obtain an au[...]

G LOSSARY 10 BA SE- T T he IEEE specific ation for 10M bps Ether net over Categ ory 3, 4 or 5 twist ed pa ir cabl e. 1 00BA SE- FX The IEEE spec ifica tion fo r 100Mbps Fas t Ethernet o ver fiber -optic ca ble. 100 BASE -T X The IEEE specif ic atio n for 100Mb ps Fast Et hernet over Ca tegory 5 t wis ted -pa ir ca ble . 1 000 BASE -S X The IE EE sp[...]

52 G LOSSARY inform ation to f orw ard pac kets b ased o n thei r dest ination a ddress. This process is know n as fil tering. br oadca s t A pac ke t sent t o al l devi c es on a ne two rk. broa dc ast sto r m Mult iple simultan eous br oadcast s that typ ically ab sor b all the avai lable net work bandw idt h and c a n cau se a net wor k to fail [...]

G LOSSARY 53 fu ll dupl ex A s y s te m th at a ll o w s p a c k et s t o b e tr a ns mi t te d a nd re c ei v ed a t th e same t ime and, in e ffect, doub les the pot ent ial throug hpu t of a link . half du plex A sy stem th at all ows pa ck ets to t ran smitted a n d receive d, but no t at the sam e ti m e. Cont rast with full du ple x . hu b A [...]

54 G LOSSARY lo op An event tha t occurs when two network d evices ar e co nnected by mor e than one path, t her eb y causing p acket s to r epeated ly cycl e ar o und the net wor k and n ot reach t heir d estina tio n. MAC Media Acces s Contr ol. A pr o tocol s pecified by the I EEE for det ermining whic h device s have acces s to a ne twork at an[...]

G LOSSARY 55 ser ver A c omputer i n a networ k that is sh ared by multip le ends tatio ns. Se rvers provide endsta tion s with acce ss to shared ne tw ork service s suc h as co mpu ter file s and prin ter que u es. SLIP Se rial Line Int er net Proto col. A protoc ol tha t all ows I P t o run ove r a serial line (con sole po rt) co nnec tion . SN M[...]

56 G LOSSARY WA N Wide Area Network. A communicat ions net work that c overs a wide ar ea. A W AN can cover a large g eo graphic area, and may cont ain severa l LANs within it.[...]

I NDEX Numbers 10 00BASE-S X 13 10 BASE-T/ 100BASE-TX por t s 13 3C n umber 1 5 3Co m Knowle dgeb ase W eb Serv i ces 47 3Com UR L 47 3Co mFacts 48 A a uto-neg ot iat i ng por ts 13 C ca bl e choos ing the corr ect 30 Matrix 16 max imum lengt h 13, 21, 22 pin- outs 41 conso le port 16 conve ntions no tice ic ons, About This Guide 8 text , About Thi[...]

58 I NDEX powe ring- up a S witch 33 00 SM 29 pro duct name 15 R rack m ounti ng a Swi tch 3300 S M 24 Re dundant Po wer Syst em. See RP S re tur ning p roduc ts for repa i r 50 RP S 15 co nnecti ng 29 soc k et 1 5 S s afe ty i nf or m ati on En glis h 3 4 Fr ench 36 German 38 segm ent, max i mum l ength 13, 21 seri al numbe r of the Switch 1 5 s e[...]

3Com Cor porat ion L IMITED W ARRANTY Th is w a rr a nty a ppl ie s t o cu s to mer s lo ca te d i n t he Un i te d S ta t es , Au s tr a li a, C an ada (e x ce pt Qu e be c) , Irel an d, Ne w Ze al an d , U. K., and other E ngl ish language count rie s, and cou ntri es for w hic h a tran slation into t he loca l lan guage i s not prov ided. S UPER[...]

shippe d to Cu stome r, at 3Co m's expe nse, not l ater tha n thirt y (30) d ays af ter 3Co m rece ives the defe ctive product , and 3C om w ill re tain risk of loss or da ma ge unt il the i tem is de liver ed t o Cust omer. 3Com sha ll not be r espons ible for any sof twar e, fi rmware, i nform ation, or me mory da ta of Cu stome r contai ned[...]

L I MITAT IO N OF L IABI L ITY TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO EXCLUDES FOR ITSELF AND ITS S UPPLIERS ANY LI ABI LIT Y, WH ETHE R BA SE D IN C ONT RAC T OR TO RT (I NCL U DING NEG LI GEN CE ), FO R INC IDE NTAL , CON SE QUE NT IA L, IN DI REC T, S P ECI AL, O R PU NI TI VE DA M AGE S OF A NY KIN D, OR F OR L OSS O F RE V EN UE OR PROFI[...]

EMC S TATEMEN TS FCC S TA TEMEN T This equi pment has be en te sted and f ou nd to compl y w ith the l imits f or a Cla ss A di gita l device , pursua nt to part 15 o f the FCC r ules. T hese limits a re desi gne d to prov ide re as onable pr otect ion aga inst harmful int e rfe re n ce wh en t he eq uip men t i s o p er at e d in a co m me rc i al[...]