Transmission standards.

-
Transmission standards.

It indicates the behavior of cable pairs with electrical signal which traverses through it . Transmission standards of cable consists of standard insulation of cable pairs, loop resistance, line loss, resistance unbalanced etc. etc.

Drop of Signal from Exchange to sub-office.
Maximum permissible transmission losses from MDF to DPs is = 8dbs

Insulation P,S & Junction

S Cable > 5000 M ohms/Km
P Cable > 1000 M ohms/Km
Jn Cable > 2000 M ohms/Km

Loop Resistance P,S & Jn cable

Cond dia Rs/Km
0.4 mm 300 ohms
0.5 mm 185 ohms
0.6 mm 127 ohms

Resistance un-balance P,S & Jn cable
Resistance measured b/w two conductor of any pair & unbalanced %tage shall be calculated.
Cond dia Ave Rs/Km
0.4 mm 1.5% 300 ohms
0.5 mm 1.5% 185 ohms
0.6 mm 1.5% 127 ohms

Line Loss
P,S & Jn cable
Measure with a Transmission Measuring Set It shall be terminated at its characteristic impedance.

Cond dia Impedance
0.4 mm 900 ohms
0.5 mm 730 ohms
0.6 mm 600 ohms

Cond dia atten/Km
0.4 mm 1.88 db
0.5 mm 1.50 db
0.6 mm 0.60 db

Popular posts from this blog

History of Labor Day

-
Casting a glance back on Labor Day history is essentially about commemorating and celebrating the American Labor Movement. It is all about knowing the share that the American laborers had in building up the nation with its richness and its many achievements. The Labor Day, usually held on the first Monday in September, inspires this sense of the togetherness that workers need to feel and share in respecting their own contribution to the history of America . Labor Day is an annual recognition of all those dedicated American workers whose achievements, both socially and economically, deserve to be honored. On every Labor Day, Americans pay their tributes to those workers of strength and perseverance whose selfless efforts have added to the growth and prosperity of the American nation. Even after a century-long celebration, there is no one consistent theory about the Labor Day history. The prominent amongst these attributes the Labor Day to one Peter J. McGuire. He is the one who is cr...
Read more

Relationships Ruined by the Internet

-
10 Relationships Ruined by the Internet The wife who found pictures of her husband's wedding to another woman at Facebook Lynn France, a wife who suspected her husband was having an affair, found he was actually married to another woman through a simple Facebook search. All she had to do was type in the name of the woman she believed her husband, John, was seeing. The pair had been married at Disney World , no less, with France's husband dressed as Prince Charming , and his new bride as Sleeping Beauty . There was like an album of 200 pictures there. Their whole wedding. She had grown suspicious when her husband began taking frequent business trips, even leaving the day the couple's newborn son came home from the hospital. Once, she found his passport at home when he was supposed to be in China for business. She once caught her husband with another woman in a hotel so a girlfriend recommended checking the woman's Facebook page, where France...
Read more