Chapter 4.
24
C-DOT NSE
7$;
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5[ 72 /2&$/
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6:,7&+ 5220
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6:,7&+ 5220
7(50,1$7,1*
0E ',*,7$/
7$* %/2&. %
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7$;
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7$* %/2&. $
25
7[
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Figure: 4.2d
EXISTING ARRANGEMENT IN DDF BEFORE INSTALLATION OF NSE
Notes: (Refer fig 4.2d and 4.2e)
a)
Initially the Tx-Rx exist at DDF as shown in fig 4.2d
b)
Rx pair to be isolated and connected to separate tab blocks, i.e. routed in serial
mode via NSE as shown in fig 4.2e.
c)
Rx pair from distant exchange terminates at NSE on la-lc pair of J 17 tab 1 via
DDF and another pair from 5a-5c of J17 tab 1 at NSE (i.e. same 7/2 connector)
goes back to DDF and is routed to the exchange via separate termination.
d)
3 nos. of 2 Mb digital trunks from trunk group connected to tax may be chosen
as reference digital trunks.
Contd…on page 25
