3Com 3C16071B manuale d’uso

http:// www .3com .com/ S up erS tac k ® 3 Ad van ced RP S Us er Gu ide 3C16071B Pa rt No . DUA160 7- 0AAA04 Re v . 0 1 Publ is hed Nove mbe r 2000 160 70ug4.bk.b ook Page i Thursday, December 14, 2000 12:17 PM[...]

3 Com Cor porati on 5 400 Bayfr ont Pl aza S anta Clara , Calif ornia 9 5052-8145 Copyri ght © 200 0, 3C om T e chno logies . All ri ght s reserved. N o pa rt of t his docume ntati on m ay be reproduced in a ny for m o r by any means or u se d to ma ke an y deri vati ve w ork (s uch a s tran sla tio n, tr ansfo rmat ion , or adaptati on) w ithou t[...]

C ONTE N TS A BO UT T HI S G UIDE Ho w to Us e This Gu ide 8 Conv entions 8 Related Docume ntation 8 Do cu me nt at i on C o mm en t s 9 Product R e g istration 9 I NTROD UCIN G THE A DVAN CED RPS About the A dvan ced RPS 11 Adv a nced RPS Cha ssis — Front View De t ail 12 LED s 1 2 Adv a nced RPS Cha ssis — Rear View De tail 13 Power So ckets [...]

Full R edundancy 19 I NSTALLIN G T HE A DV AN CED RPS Unpacking the A dva nced RPS 2 2 Choosin g a Su ita b le Site 22 Rack Mounting 2 3 Using the Rac k Mounting Kit 23 Placing Units On T op of Each Other 24 Installing a Power Mo dule 24 Power S upp ly and F use s 25 Connectin g the DC Cables 2 5 St andard DC Cabl es 26 Optional ‘ Y ’ DC Cables[...]

M ODUL E C ON FIG URA T ION S SuperS tack 3 Advanc ed R PS Chassis Loading L imitations 41 V a lid C onfigura t i ons 41 Sing le Mod ule Config urations 41 Full Redundanc y Configuration s 43 I nva lid C on fig u rat io n s 43 Pow er Module Usage 4 3 Units not supported 47 Obsolete Pr oduc ts 48 T ROUBLESHO OTING T ECHNIC AL S U PPORT Online T e ch[...]

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A BOUT T HI S G UI DE This gu ide describes how to install the S u perStack ® 3 Advance d Redu ndant P ow e r System (RPS ) and use it to provide redunda nt and r esi lient power suppli es for you r Supe rStack units. The guide is intended for us e by netwo rk administrators who are r esp onsibl e for s etting u p n etwork equip ment; conse quentl[...]

8 A BO UT T HI S G UIDE Ho w to Us e Thi s G uid e The fol lowing ta bl e show s where to find spec ific in f o rmation in this guide. Con vention s T able 1 lists conventions that ar e used throughout this gu ide. Rela ted D ocume nt ation The fol lowing d ocuments will p rov i de addi tional useful informati on. ■ Advanc ed RPS T ype 1 Pow er M[...]

D ocu men t atio n Co mm en ts 9 ■ Adv anced RPS T y pe 2 ‘ Y ’ Cab le Us er Guide (D UA1607-8A AA0X) ■ Adv anced RPS T ype 3 Power M odule Install atio n Guide (D UA1607-5A AA0X ) ■ Adv anced RPS T y pe 3 ‘ Y ’ Cable Installation G uide (D UA1607-7A AA0X ) D ocu ment ation Co mm en ts Y our suggestions ar e very important to us. They[...]

10 A BO UT T HI S G UIDE 160 70ug4.bk.b ook Page 10 Thursday, December 14, 2000 12:17 PM[...]

1 I NTR ODU CING THE A DVANCED RPS This chapter contains intr odu ctory information about the SuperStack ® 3 Advanced Re dund ant Power System (RPS), its asso ciated products, and how they can be used to support y our SuperStack network dev ic es. It covers the fol lowing top ic s : ■ Abou t the Adv anced RPS ■ Advanc ed RPS Chass is — Front[...]

12 C HAPTE R 1: I NTRODUCIN G THE A DVANCED RP S Ad vance d RPS C has sis — Fron t V ie w D e ta il Fi gure 1 F r ont View of t he A dvance d RPS Ch assi s LEDs The Adv a n ced RPS chas sis has LEDs visible on the fr ont panel tha t indicate the s tatus of the AC powe r inputs, the p ower m odul es, a nd the temper atur e of th e ch as si s i tse[...]

A dvanced RPS Chassis — Rea r V i ew De tail 13 Ta b l e 1 LED beh avio r A dvan ced RP S Cha ssi s — Rea r V i ew D eta il Fig ur e 2 Rear Vi ew of the Ad vanced RPS Cha ssis Po wer S ock ets (Mai n s AC P ow er) The A dvanc ed RP S chassis has two AC mai ns inputs, labe lled Prim ary Pwr A and Backup Pwr B. It pr ov ides dual phase support, t[...]

14 C HAPTE R 1: I NTRODUCIN G THE A DVANCED RP S accepts its m ains pow er from two A C s ourc es tha t ca n b e from separ ate phase s. 3Com require that you c o nfirm that y our chassis supports the dual phas e feat u r e by checki ng t h a t “ 3C16071A ” or “ 3C16071 B ” ap pears on the serial num ber label on the base of th e chassis, t[...]

Po wer M odules 15 Pow er M o dules Ther e are four pow er mo d ules a vail able that of fer dif fer ent DC po wer outputs. Sel ect the a ppr op riate module for each SuperS t ac k un it you want to connect to the c hass is. De tails of the S uperStack equi pment r equirements are given in Append ix C a nd the manual that ac compani es the p owe r [...]

16 C HAPTE R 1: I NTRODUCIN G THE A DVANCED RP S T y pe 3 ( 325 W ) P owe r Mo d ule — 3C 16 075 This module is suitable for pow er ing a spec ific range of Supe rStack units. See Appendix C for a list of these units. Thi s modul e pr o vides +27 V through the conne ctor . A T ype 3 DC p ower c able i s suppli ed with each module. CAUTION: The T [...]

Po wer Modu le Ca bles 17 Fig ur e 5 T ype 1 DC ‘ Y ’ Cabl e (3C 160 79) T ype 2 DC Cabl es Use a T y pe 2 DC cable, s upplied w ith each T ype 2A Pow er Mod ule, to conne ct a T ype 2 A Power Modul e to a S uperStack unit. An option al T y pe 2 ’ Y ’ DC cable (3C160 78) i s available to connect tw o T y pe 2 A P ower Modules to a SuperStac[...]

18 C HAPTE R 1: I NTRODUCIN G THE A DVANCED RP S Fi gure 7 T ype 3 D C ‘ Y ’ Ca ble ( 3C1607 7) U s ing t h e Adva nce d R PS Ther e ar e several way s y ou c an us e the Advanc ed RPS to benefit your network a nd pro t ec t agains t inter nal PSU f ai lur e o n your S u perStack units. These ar e detailed below . Sta nda r d Us age Connect you[...]

U s ing the A dvance d RPS 19 The Supe rStack unit is suppli e d w ith power from an AC m ains supp ly . A power module is c onnec ted using t h e standard D C cable to the RPS so cket on the SuperSt ack unit (see Figur e 9). If the internal po wer supply fails, the SuperStack u nit enable s the Advanced RPS. CAUTION: If the prod uct you ar e conne[...]

20 C HAPTE R 1: I NTRODUCIN G THE A DVANCED RP S Make sure you use t h e corr ec t type of ’ Y ’ c able for the right module co mbinat ion. See “ Po we r M o d ul e s ” on pa ge 15 for front v iews of the di f fere nt conne ctors. If one of the power modules f ails, the other module will take the ful l lo ad. The fa ulty m odule c an be “[...]

2 I NSTALLING T HE A DVANCED RPS CAUTION: The T ype 3 DC Power Mo d ule i s for inst allat ion by suit ably qu alified service personnel onl y . R efer to the T y pe 3 Power Modul e I nsta lla tion Guid e. This cha pter contains the in f o rmation you need to install and set up the SuperS tack ® 3 Adva nc e d R PS ch a ss is . It co ver s th e f o[...]

22 C HAPTE R 2: I NSTA LL ING T HE A DVANCED RP S U n packing t he A dv an ced RP S The A dvan ced RPS pa ckagi ng conta ins: ■ A c hassis ( 3C16071 B) ■ T w o main s po we r cords ■ A rack mo unting ki t (two m ounting bracket s and ei ght sc r ews ) ■ Four se lf-adhesive rubber pads (feet) ■ Thi s m anual ■ Registrati on information C[...]

R ack Moun ting 23 R ack M ounting The Ad vanced RP S i s 2 U hig h and can be mou nted in a 19-in. equi pment rack. The rack must be well ve ntilated — 3Com r ec ommend usi ng an open frame type. 3Com reco mmend tha t runners or a tray b e fitted i n the rack to support the weig h t of th e Ad van ced RP S cha s si s w hen i nstal led int o the [...]

24 C HAPTE R 2: I NSTA LL ING T HE A DVANCED RP S 6 Connect all cables. Placing Un its On T op of E ach Ot her CAUTION: Do not p lace the A dvanc ed RPS alongsi de y our SuperS tack ® units , as this can impede a ir flow through the A dva nced RPS. Y o u may stac k up to e ight of the allowable uni ts (see Appendix C ) in a fr ee -standing stack o[...]

Po wer Suppl y and Fu ses 25 CAUTION: If you need to replace a P o wer Module u sed in full redund ancy c onfiguration, remove the ’ Y ’ cable conne ction from it before remov ing t he m odule. Rem emb er the c old pow er m odule will n ot su pply pow er for about 5 sec onds. Y ou can “ hot-insert ” the A dva nced RPS Power Modules i n to t[...]

26 C HAPTE R 2: I NSTA LL ING T HE A DVANCED RP S CAUTION: T he T y pe 3 DC Power Module is for install ation by suitably qualified ser vice personne l only . Refer to t h e T yp e 3 Power Mo dule Insta ll ati on Gu ide . CAUTION: Only use the ca bles designed for t he power module you ar e in stal ling. CAUTION: When matin g the RPS connectors to [...]

Powerin g Up the Adva nced RPS 27 Pow ering U p the A dvanc ed RPS Once the Advanc ed RPS is in place, you can p ower up the unit. 1 Conne ct the A C pow e r c ord( s) to the pow er soc kets ( m ains AC power inlets) at the r ear o f the RPS. The c hass is will al ways dr aw po wer through mains i nlet A (labelled P rimary Pwr A ) in pr eference to[...]

28 C HAPTE R 2: I NSTA LL ING T HE A DVANCED RP S W ith a T yp e 3 Power Module configured for managed r edu ndancy , i f the SuperStack unit ’ s mains fa ils, the po wer m odul e wi ll automatically c ut in to provide power , w ithout the un it expe r i e n cing a r eset. If the SuperStack unit ’ s ma in s ret ur n s, i t w ill de fa ult b ack[...]

A S AFETY I NFORM ATION Y ou must r ea d the followin g safety information before ca rr ying out any insta llation or r emov al o f components, or any maintenance procedur es on the SuperStack 3 Adv anced RPS . WARNING: W a rnings contain directions t h at y o u must foll ow for your persona l saf ety . F o llow all directions carefully . Y ou must[...]

30 A PPEN DIX A: S AFETY I NFO RM AT ION dete rm ine l oading limita tions. I t is i m portant that the loading li mitati ons are not exceede d . ■ Connect the un it to a n earthed p ower supply to ensure compl ia nce with sa fe ty stan dards. ■ It is essenti al that the socket out let is in stal led near to the unit and is easily accessibl e. [...]

Impor tant Saf ety Info rm ation 31 Fran ce an d Peru O nly This unit cann ot be powered fr om IT † suppl ies. If your sup plies are of IT type, this u nit m ust be powe red by 230 V (2P+ T ) via an i s olation transform er of r atio 1:1, w ith the seco ndary connection point label led N eutral, connected dir ec t l y to E arth (G r ou nd). † I[...]

32 A PPEN DIX A: S AFETY I NFO RM AT ION L ’ inform at ion de S é curit é Im port ante V eui llez li re à fond l'i nfo rmati on de la s é cu r it é suivante avan t d'in st a ller l ’ Adv anc ed RPS . A TTENTION : le Powe r Modul e de T ype 3 doit ê tre install é uniqueme nt par l e personne l qualifi é . S e r é f é fer au m[...]

L ’ info rmation de S é curi t é Importa nte 33 ■ Co rdon é le c t r iq ue : Il doit ê tre a gr éé dans l e p a ys d' ut ilisa tion: Se ulement Po ur L a France e t Le P é rou Cette unit é n e pe ut pa s ê tre mise en m arche des s our c es de cou rant IT (Im p é da nc e à la terre). Si v os sour c es d e courant sont de type IT[...]

34 A PPEN DIX A: S AFETY I NFO RM AT ION ■ D é branche z les co nduc teurs é lec triques secteur avant de pr oc é der à un e interventi o n d'entr etien courant. Wicht ige Siche rh eitsinf orma tione n Bitte unbed ingt vo r dem Einbau en des Advanc ed RPS Einheit die folgen den Sicherh eitsan wei sung en durchlesen. WAR NUNG : Di e Ins t[...]

Wi chti ge S iche rhei tsinf orm atio nen 35 ■ Aus sch lie ß lich d ie f ü r dieses Produkt k on str u iert en und gelie f erten Sp e z ialkabel benutzen. Eu ro pe ■ Das N etzk abel mu ß v om T yp HO3VVF3 GO. 75 (Mindesta nfor d erung) sein und die Aufschrift <HAR> oder <BASEC> tragen. ■ Der Netzstecker mu ß di e N orm C EE 7/[...]

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B T ECHNIC AL S P E C IF IC A T I O N S Supe r Stack 3 A dva nce d R PS Ch as sis P hysi cal Dime ns ions (ch assi s em p ty ) Hei ght: 90 mm ( 2U) x Wi dth : 44 0 mm (1 7.3 in.) x Dept h 370 mm (14.5 in .) Wei ght : 8.5 Kg (18. 7 lb) E nvir onme nta l Requi re m e nts Ope rati ng T em p era tur e 0 ° to 50 ° C (3 2 ° to 1 22 ° F) Sto rage T em[...]

38 A PPEN DIX B: T ECHNI CAL S PE CI F I CA T IO N S Powe r Modu les Electric al T yp e 1 6 0 W Power Mo dule T yp ic al Input powe r: 100 W – T yp e 1 1 00 W Power M odule T y pi c al In put Po we r: 167 W T yp e 2 A ( 1 0 0 W ) P ow e r M o du le T y pi c al In put Po we r: 167 W Ma ximu m p owe r ou tpu t 5 V 8.5 A 12. 6 V 2.5 A – 12.0 V 1.0[...]

Power M od ules 39 T ype 3 (325 W) Powe r Mod ule CAUTION: The T ype 3 DC Power Mo d ule i s for inst allat ion by suit ably qu alified service personnel onl y . R efer to the T y pe 3 Power Modul e I nsta lla tion Guid e. T y pical I nput Power: 365 W Ph ysi cal Dime ns io ns Maxi mum po wer out put 27 V 12.0 A T otal continu ous outp ut powe r: 3[...]

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C M OD U L E C ONFIGURATI ONS Supe rSt ack 3 Adva nced RPS Ch assis Loading Li m itation s WARNING : Do not ov e rlo ad the chassis — refe r to T abl e 2 “ Max imum Number o f Advanced RPS Powe r Modules per Cha ssis ” to determine loadi ng limitati ons. It is importan t that the loadin g limita tions a re not exceeded . AT T E N T I O N : Ne[...]

42 A PPEN DIX C: M ODULE C ONF IGU RA TIO NS T ype 2 or T ype 2A Powe r Mo dules may be use d in c om binati ons similar to the T ype 1 1 0 0 W Pow er Modu les. Ta b l e 2 Max imu m N umb er o f Ad van ced R PS Pow er M od ule s pe r Cha ss is Co nfi gurat io n Typ e 1 6 0 W Modul e (3C1 607 2) Ty pe 1 10 0 W Mo dul e (3C16 073), Type 2 (100 W) Mod[...]

Invalid Configurations 43 Ful l Re dundan cy Con fig ura tio ns If you want a f u lly redunda nt configuration, you can pair power modul es ( of the sam e type) i n the ch assis, provided y ou use Y - cab les of the appropri ate type to c onn ect a pair of modules to a single SuperSta ck unit. The two m odul es count as one m odule. T his i s then [...]

44 A PPEN DIX C: M ODULE C ONF IGU RA TIO NS S upe rSta ck Prod ucts r equi r ing a Type 1 60 W Power M od ule 3 C215A Hub 100 Ma nageme nt U nit 3 C250- T4 Hub 100 T4 (also with 3C 252 or 3C2 62 Modu le f itted ) 3 C25 0A-T X/I Hub 100 TX (als o wi th 3 C252 or 3C262 M odules fitte d) * 3C7 204A AccessB uilde r ® 22 04 * 3C7 208A Acc essB uilde r[...]

P ower Mo dul e Usage 45 *3C 16406 PS Hub 40 24- port (als o wi th a val id co m b inati on of 3C 1206X Tran sceiver Mod ules fitt ed) *3C 16450 PS Hub 50 24- port (als o wi th a val id co m b inati on of 3C 1206X Tran sceiver Mod ules fitt ed) 3C1 666 5A Hub 1 0 Fib er ( also wi t h 3C166 30A or 3 C16632 Mana gement M od ule and 3C1 206 X Tr ansc [...]

46 A PPEN DIX C: M ODULE C ONF IGU RA TIO NS 3 C94103R -CS IX Ope n Par tne r Bo und ary Rout er 1 3 C94103R -CS D Open Pa rtne r Bo undar y Rout er 2 3 C94103R -CS DI Open Pa rtner Bound ary Rout er 3 3 C94103R -CS E Open Pa rtne r Bo undar y Rout er 4 3 C94117C -XS O p en Par t n er C o m ms S er v er 1 6 -po rt 3 C94133C -XS O p en Par t n er C [...]

P ower Mo dul e Usage 47 Unit s not s uppor ted *3C 16987 S witc h 3 300 SM *3C 16988 S witc h 3 300 MM *3C 39024/ 3 6 S witc h 3 900 *3C 93011/ 2 S witc h 9 300 *3C 16464 Bas el in e 10 /10 0 Sw it ch 12 - p or t *3C 16465 Bas el in e 10 /10 0 Sw it ch 24 - p or t Sup erStack Produ cts r e qu irin g a Typ e 3 P ower M odule *3C 17700 S witc h 4 90[...]

48 A PPEN DIX C: M ODULE C ONF IGU RA TIO NS Obs olete Produc ts The foll owing p roducts hav e be en replac ed by Supe rStack un its, but the Advanced RP S will support them. S upe rseded Product s requi ring a 6 0 W Typ e 1 Pow er Mo d ule LinkB uilder ® Hubs 3 C215A Hub 100 Ma nageme nt U nit 3 C250- TX FMS 10 0 TX 3 C16665 FMS II F iber (als o[...]

Obsol e te P rodu cts 49 : 3C8 423 C NETBu ilde r Re mot e Of fice 423 3C8 424 C NETBu ilde r Re mot e Of fice 424 3C8 427 C NETBu ilde r Re mot e Of fice 427 3C8 523 C NETBu ilde r Re mot e Of fice 523 3C8 527 C NETBu ilde r Re mot e Of fice 527 Lin kSwi tch 3C1 690 0 Li nkS witc h 10 00 2 4-p ort ( also wit h 3C120 6x or 3 C16920/ 2 modu les f it[...]

50 A PPEN DIX C: M ODULE C ONF IGU RA TIO NS 3 C32700A Sw itch 2700 O C-3 Mul timode A TM 3 C32710A Sw itch 270 0 DS -3 A TM 3 C32711A Sw itch 270 0 OC-3 Singl emode ATM 3 C220000 A Lin kSwi tch 2200 160 70ug4.bk.b ook Page 50 Thursday, December 14, 2000 12:17 PM[...]

D T R OUBLESHO OTING If the L EDs on the Super Stack ® 3 A dv anced RPS cha ssis in dicate a problem refer to T a ble 3 w hich c ontains a list of problem s and po ssible faults. If you have a pr oblem that is not li sted here and yo u ca nnot solve i t, please contact your local technical sup port r epres entative. Ref e r to Appendi x E . Ta b l[...]

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E T ECHNIC AL S UPPO RT 3Com provides easy access to technical suppo rt information through a vari ety o f s e rvices. This appendi x d es cri bes these s ervic es. Inf or mati on cont a i ne d i n thi s appen dix is corr ect at t ime of pub lic ati on . For the m ost recent informa tion, 3 Com recomm ends th at you a ccess th e 3Com Co rpora ti on[...]

54 A PPEN DIX E: T ECHNICAL S UPPO RT r ound -the-clock access to technical information on most 3Com pr odu cts. 3Com F TP Site Down load d rivers, patches , softwa re, an d M IBs acr o ss t he Inter net from th e 3 C om pu bl i c F T P s i te. T hi s ser vic e i s av ai la bl e 2 4 ho ur s a da y , 7 da ys a week. T o connect t o the 3Com F TP sit[...]

Supp ort from 3C om 55 op t i ons, c all the 3Com tec hnical telephon e sup port pho ne numbe r at the lo cation n ear est you. W hen you contact 3Com for assistance, have the followi ng informati on r eady: ■ Product model name, part number , and serial numbe r ■ A list of s ystem hardwa r e and software, inclu ding r evision level s ■ Diag [...]

56 A PPEN DIX E: T ECHNICAL S UPPO RT Retu rni ng P roducts for Repair Before you s end a p roduct dire ctly to 3 Com f o r repair , you m ust first obtain an authorization number . Pr oduc ts sent to 3Com without authorization numb ers will be r etur ned to the sender uno pene d, at the sender ’ s e xpens e. Austria Belgium Den mark Finl and Fra[...]

Re t u rn in g P r od u cts f or Rep ai r 57 T o ob tain an a uthoriz atio n nu mber , c all or fa x: Cou ntry Tel ephone Number Fa x Number As ia , Pac ifi c Rim + 65 543 6500 + 65 543 6 348 Br azil 5511 523 272 5 E urope, Sou t h Afri ca, and Mi ddle Eas t + 31 30 6029900 + 31 30 60 29999 Ce ntral and South Ame r ica 525 201 0075 F rom the fol lo[...]

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I NDEX Num e rics 3 Com Knowl e dgeb ase Web S ervic es 5 3 3C o m UR L 53 A Ad vanc ed RPS Chas sis d imensi ons 37 si ze 3 7 weight 37 a ir flow 22, 24 a uto-ena ble featu re 18, 27 C Ca bles ’ Y ’ DC 16 c onnecti ng 26 r edundancy 1 6 s tandar d DC 16 c onfigu rati ons fu ll red undancy 19 man aged r edundan cy 18 s tandar d us eage 1 8 c on[...]

60 I NDEX R rac k mountin g an Adv anced RPS rac k mou nting ki t 23 runne rs 23 tr ay 2 3 r eturning produ cts fo r re pair 56 R PS co nnec tor 19 S S afe ty In for mati on E nglis h 29 Fre n ch 32 Ge rman 34 SN M P 14 s tacki ng un its 24 T t echni cal su pport 3C o m K n ow le dg e b a s e We b Se r vi c e s 53 3C o m UR L 53 n etwor k sup plier[...]

3C om Co rpora t i on L IMITE D W ARRANT Y Thi s warra nty app l ie s to cu sto mers loca ted i n t he U nit e d Stat es, Aus tra lia, Can ada (ex cept Que bec ), Ir el and , New Zea land, U.K., a nd othe r English l angu age coun trie s, and count ries for which a transl atio n into the l ocal la nguage is n ot pr ov id ed Super Stac k ® 3 Ad van[...]

O BT AI NI N G W AR RANT Y S ER VI CE Custo mer mu st cont act a 3Co m Corpo rate S ervice Ce nter or an Au th orized 3Com Se rvice Center wit hin the appli cable wa rra nty perio d t o obta in wa rranty s ervice auth orizati on. D ated pr oof of purc hase from 3Com or its au tho ri zed re se lle r ma y b e r eq u ir ed . Pro du cts r e tu rn e d t[...]

AND A RE I N LI EU OF ALL OT HER W ARR ANT IES, TE RMS, OR CON DITI ONS , EXP RESS OR IM PL IE D, EI THER I N FACT OR BY OP ER AT ION OF L AW , ST AT UT ORY O R OT HE RWI S E, I NC L UDI NG W AR R AN TI ES , TE RM S , OR C ONDI TI ONS O F ME R CH AN TA BIL I TY , F I TN ES S F OR A P AR T IC UL AR PU R PO SE , SA TI SF A CT O RY Q UA L IT Y, CO RRE[...]

R EGULATO RY N OT ICES FC C S TA TEMEN T This equi pme nt has been tes ted a nd found to co mpl y w ith the limi ts for a Class A digita l device , pursu ant t o part 15 of th e FCC r ules. These li mi ts are design ed to p rovide reas onable prot ectio n agai nst harm ful i nterf eren c e whe n the equipm ent i s opera ted in a comme rci al envir [...]