Ptcl call setup between different exchanges
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Local calls within the same exchange are routed through the main distribution frame and copper cables directly connecting the users. Local calls between different exchanges are routed from one exchange's main distribution frame through a digital distribution frame and onto the other exchange's main distribution frame. Transit calls between different transit exchanges are routed from one exchange through optical fiber links to other transit exchanges until reaching the destination exchange. International calls between gateway exchanges are routed from one local exchange through transit exchanges and international gateway exchanges connected by submarine cables or satellites.
Ptcl call setup between different exchanges
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- 2. PTCL Call Setup Between Different Exchanges
- 3. 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. 4 Local Call Setup between Different Local Exchanges MDF LE DDF DDFL.E.MDF Digital Distribution Frame User A User B
- 5. 5 Transit Call Setup between Different Transit Exchanges LE LE DDF TE DDF Transit Exchange (TE) Optical Fibre Optical Fibre TE TE DDF LE DDF LE User A User B Transit Exchange (TE)
- 6. 6 International Call Setup between Gateway Exchanges LE LE DDF TE DDF TE Optical Fibre Optical Fibre TE TE DDF LE DDF LE User A User B IGE DDF IGE IGE IGE DDF Submarine (OF) Cable Int. Gateway Ex. (IGE) Satellite
- 7. 7 Prepared by: Tayyab Sher Contac: +923017252598 International Islamic University Islamabad Supervised by: Engr. Khalid Sarwar Contact: +923135003545 PTCL Satellite Town Rawalpindi