TelephoneNetworkCosts

Breakdown of Telephone network costs
Connecting 1km of houses will need 1. 75mm underground CableFlex ducting. (R11000) 2. 2km 15mm LDPE for the TwistedPair. (R2000) 3. Six DsLam. (R21000) 4. 26km TwistedPair copper wire, providing 46meg bandwidth to each house. (R13000) These 4 points are the major expense and gives one a rough indication that the costs will be about +- R47000. Add an extra R10 000 for extra items as explained on this page.

There are on average 42 houses in a street as explained at TelephoneNetworkRollout. Thus R57000/42 = R1350 on average per residence.

Cost of underground ducting
Underground ducting can be done either at the Joint Perimeters or under the driveway of each residence. Ducting under the driveway is prefered since one doesn't need access to each person back-yard. The costs calculation is done for a 1km stretch of houses as indicated by figure PavementTrench.png

R742/house   44houses

DSLAM costs
Eight port DsLam at $500 is $62,50/port per CPE ADSL modem. Thus R438,00/house. Total DsLam cost per 44 houses = R21900. This provides six DsLam per street.  {{{ R21900 DSLAM R32650 Wireing

=
R54550 DSLAM and Wireing will provide 24meg downstream and 1.6meg upstream per house to the CentralOffice. }}} 

Total Twisted Pair wireing length for 1km of homes
Lets work on a figure of on average 44 houses down a 1km street. The total TwistedPair wireing will be 26km. This provides each home with two TwistedPair. One pair for an ADSL modem which connects to a DsLam and the other for a VDSL bridge. 



Six houses on one switch
Ethernet is limited to 100m. Connect six houses via a VibratoryPlow to a ServingAreaInterface. The SAI houses the SwiTch. The SwiTch is indepedant of the CentralOffice which houses the DsLam. By using a SwiTch the upfront costs is considerably reduced since not every house needs to be on a DsLam port. As the network scales and funds become available each house be connected to its own DsLam port. Cat5 cable is R2,00/m wholesale. Working on a distance of 50m on average for these six Drillboxes to reach the SAI = 300m. BR Cat5 cable cost is thus R600. Or R100/house. The SwiTch connects to the ADSL modem at the SAI. This leads to a cost saving of about R12000 for the whole 1km street enabling 42 houses to share one 8-port DsLam box.

Telephone poles vs CableFlex
The cost saving is about R7000 for a 1km street if TelephonePoles are used instead of CableFlex.

Expense varies from R55000 to R35000
If every house has it's own DsLam port and uses underground CableFlex then the cost is R55000/km. But if TelephonePoles, DsLam and a SwiTch combination is used the costs are R35000/km.

Links
*TelephoneNetworkRollout *FinancingTelephoneNetworks