The genesis of this requirement may go back to some of the discussions regarding 1000-4-5 and later CISPR 24. As I recall, there were some interests who felt it appropriate to surge test all communication lines. 10 meter length was added to exclude such things as interconnecting RS232 cables to printers and other local peripherals.
There were further discussions which protested surging indoor cables at all. As a result, in CISPR 24, the requirment is to surge test only cables that MAY be connected to outdoor facilities. Telecom intersts have always been particularly paranoid regarding requirements, and through ETSI, they restored the questionable requirement to surge test all comm cables over 10 meters in length. John P. Wagner AVAYA Communication 1300 W. 120th Avenue, Room B3 D16 Denver CO 80234 email: [email protected] phone: 303 538-4241 fax: 303 538-5211 > ---------- > From: Zohar Zosmanovich[SMTP:[email protected]] > Reply To: Zohar Zosmanovich > Sent: Wednesday, December 20, 2000 4:47 AM > To: '[email protected]' > Subject: Surge (immunity) requirement for equipment in > telecommunication c enters > > > Hi, > > The EN 300 386 (EMC requirements for telecommunication network equipment) > require to perform a surge of 1.2/50 Tr/Th us, 0,5 kV to ports for indoor > signal lines (in telecommunication centers), when cables longer than 10 m > are connected ! > Can some one explain my the rational of divided up to 10 m and more than > 10 > m, anyway all cable is in the building (indoors) ? > > Zohar (Jana) Zosmanovich > Compliance Engineer, RADWIN ltd. > 34 Habarzel St., Tel Aviv 69710, Israel > Tel.: 972-3-7666735 ; Fax: 972-3-7657535 > Email: <mailto:[email protected]> > > > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Jim Bacher: [email protected] > Michael Garretson: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
