1

PTCL Call Setup Between Different

Exchanges

3

Local Call Setup within the Same Local Exchange

MDF LE

User A

User B

DP DC

Distribution Point

Distribution Cabinet

Main Distribution

Frame

Copper Cable

Local Exchange

4

Local Call Setup between Different Local Exchanges

MDF LE DDF

DDFL.E.MDF

Digital Distribution

Frame

User A

User B

5

Transit Call Setup between Different Transit Exchanges

LE

LEDDF

TEDDF

Transit Exchange

(TE)

Optical Fibre

Optical Fibre

TE

TEDDF

LEDDF

LE

User A

User B

Transit Exchange

(TE)

6

International Call Setup between Gateway Exchanges

LE

LEDDF

TEDDF

TE

Optical Fibre

Optical Fibre

TE

TEDDF

LEDDF

LE

User A

User B

IGEDDF

IGE

IGEIGEDDF

Submarine (OF) Cable

Int. Gateway Ex. (IGE)

Satellite

7

Prepared by:Tayyab Sher

Contac:+923017252598

International Islamic UniversityIslamabad

Supervised by: Engr. Khalid Sarwar

Contact:+923135003545

PTCL Satellite Town Rawalpindi