CSN 1

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					CSN (Digital Satellite Centre)
CONTENTS
1.   Location of the CSN
2.   Connection of Sub.lines to the CSN.
3.   UCN functional break down.
4.   Connection of CSN to the OCB-283.
5.   Connection of digital concentrator.(CN)
6.   CNL / CNE configuration.
LOCATION OF CSN
 CSN is:
    A Sub. connection unit for both analog and
       digital Sub. Lines.
    Connected to time base switching system using
       No.7 signaling.
    Can be co-located (CSNL) or remote (CSND)
       w.r.t. connecting switch.
 The CSN comprises of two parts:-
   i. UCN : The digital control unit.
   ii. CN :      The concentrator.
 UCN   is the part that can be either local
  or remote w.r.t connecting switch.
 Sub. Lines are connected to the CNs.
 CN can also be a local (CNL) or remote
  (CNE).

 Decentralization is therefore at two
 levels providing more flexibility in
 choosing a location of CSN & CNs.
CSN CONNECTIONS TO THE NETWORK

         Analog Sub
           (
    Dig. Sub.           CSNL
           :
  Analog Sub                   CONNECTING

        (
                                 SWITCH

  Dig. Sub.           CSND
        :
    (           CNL                  LR
    :                         UCN
    (          CNE
    :
                       CSNL
                                          CONNECTING

(       CNL                         PCM
                                            SWITCH


:                    UCN
(       CNE
:
              CSND
SUBSCRIBER CONNECTION TO THE CSN

  The CSN was designed for ISDN, purposes meaning
  that the following can be connected to the CSN.
 Analog Sub. Lines.
 Digital Sub. Lines at 144 Kbit/S i.e. 2 B-channels at
  64 Kbit/s + 1D channel at 16 Kbit/S (2B+D) known
  as basic rate access.
 PCM links for PABX providing 30B +1D each of 64
  kbit/S.known as Primary rate access.
SUBSCRIBER CONNECTION TO THE CSN
        (                              C
                         144 Kbit/s        LRI
         NT                            N
                       2048 Kbit/s
                                       L
                                                 U   2 TO 16PCM
        PABX                                            or LR
                                       M         C
            (                      C
    (       NT
                   144 Kbit/s
                                   N       PCM   N
    :       PABX
                     2048 Kbit/s   E
                                   M
CNLM : Mixed Local Digital Concentrator.
CNEM : Mixed Remote Digital Concentrator.
NT : Net work Terminal .
LR : Network Link.
LRI : Internal Network Link.
UCN FUNCTIONAL BREAKDOWN
  UCN is interface between the CNs and connecting
  switch. It comprises of :-
1)An Auxiliary Processing group or unit (GTA) for
  certain auxiliary function as:-
 Generation of tones & announcements during
  independent operation of CSND.
 Recognition of DTMF dialing during independent
  operation of CSND.
 Management of infrastructure & PCM alarms.
 Testing Sub. Lines connected to local concertrator.
UCN FUNCTIONAL BREAKDOWN
2) Duplicated command & connection unit (UCX)
   operating in Pilot / Reserve mode.
 The pilot UCX controls traffic & updates the reserve
   UCX event by event.
 In case of fault, the reserve UCX takes control of all
   the traffic.
UCX is further devided into two parts.
  i.  The connection Network. (RCX)
  ii. The control Unit. (UC)
  The CSN has two levels of concentration:-
          At CN levels.
          At RCX level.
FUNCTIONAL BREAKDOWN OF UCN
         SUBSCRIBER
                            CNL                CONNECTING
SUBSCRIBER                              UCN      SWITCH
                                PCM
               CNE
             SUBSCRIBER
                                CNL
                                                   CONNECTING
SUBSCRIBER                       PCM     UCX         SWITCH
                   CNE
                                         GTA
               SUBSCRIBER

SUBSCRIBER
                                CNL
                                         RCX       CONNECTING
                          PCM
             CNE                 ICNE                SWITCH

                                          UC
                                         GTA
CONNECTIONS OF CSN TO THE OCB-283

 i)   CSNL CONNECTION.
  2 to 16 LR links connect the CSNL direct to
   the connection matrix (MCX).
  First two links i.e. LR0 & LR1 convey the C-7
   signalling in T.S.16.
  Time slot 16 of other 14 LR can be used for
   speech
CSNL CONNECTION TO
AN OCB 283 EXCHANGE
                       CCITT No.7
                            T.S 16
                       0
                            T.S 16
        CNL            1

                 RCX                 MCX

          ICNE
  CNE
                       15
                 UC

                 GTA
CONNECTIONS OF CSN TO THE OCB-283

  ii) CSND CONNECTION.
   CSND is connected to the OCB-283 switching
     matrix (MCX) through SMT.
   2 to 16 PCM are used to connect CSND to the
     SMT.
   Time slot 16 of PCM 0 & PCM 1 are used to
     carry #7 signalling.
   Time slot 16 of other PCM can be used for
     speech.
CSND CONNECTION TO
AN OCB 283 EXCHANGE
                        CCITT No.7         CCITT No.7

                            T.S 16               T.S 16
                       0                     0
                            T.S 16               T.S 16
        CNL            1                     1

                 RCX                 SMT                  MCX
          ICNE
  CNE
                       15                    15
                 UC

                 GTA


        CSND
      CONNECTION OF CN TO THE UCN
       CONNECTION NETWORK (RCX)
   2 to 4 LRI are used to connect one CNL to RCX.
   All time slot 16 of these LRI carry HDLC signalling for
    messages between the CN & UCN.
   Maximum 42 LRI links can be used to connect all the
    concentrators (CN) to the connection network (RCX).
    Maximum 19 CNL can be connected to the RCX.
   2 to 4 PCM are used to connect one CNE to RCX
    through ICNE.
   Maximum 20 CNEs can be connected to RCX.
   Maximum 42 PCM can be used to connect 20 CNEs with
    ICNE.
CN CONNECTION TO THE SWITCHING MATRIX (RCX)

                                            HDLC
                                             T.S 16
                                      0
                                       1
                              CNL            T.S 16
                                      3
                                            2 TO 4 LRI             CONNECTION
                                                                  SWITCH BOARD
                   HDLC
                                             HDLC
                                             T.S 16      42 LRI
                   T.S 16
             0
                                             T.S 16
   CNE      3
                   T.S 16
                                              HDLC
                 1 TO 4 PCM
                               ICNE        1 TO 4 LRI

                  HDLC                       HDLC
             0
   CNE      3
                                                         RCX
                                            1 TO 4 LRI
                  1 TO 4 PCM


    LRI 0 & LRI 1 are for internal use.
    LRI 2,3&4 to connect GTA to UC.
    Lri 5 free
    LRI 6 to 47 for connection of CNL CNE
CSN : 19 CNL CONFIGURATION
  CSN-B       CSN-E    CSN-E    CSN-E
 CONNECTION   POWER    POWER    POWER
  INTERFACE   SUPPLY   SUPPLY   SUPPLY

  UCN         CNL 4    CNL 9    CNL 14
   CNL 0      CNL 5    CNL 10   CNL 15
   CNL 1      CNL 6    CNL 11   CNL 16
   CNL 2      CNL 7    CNL 12   CNL 17
   CNL 3      CNL 8    CNL 13   CNL 18
CSN: CNE CONFIGURATION

   CONNECTION         CNE 0
    INTERFACE

    UCN
                      CNE 1




                PCM
     ICNE
                      CNE 19
CSN: CNL AND CNE CONFIGURATION

       CONNECTION            CNE 0
        INTERFACE

        UCN
                             CNE 1
        CNL 0
        CNL 1
        CNL 2
         ICNE
                             CNE n

MAXIMUM OF 20 CN (CNL+CNE)
SUMMARY.
               CSN

          CN         UCN (Duplicated)


    CNL        CNE

                     GTA
                              UCX (Duplicated)


                                UC       RCX
SUMMARY
   CSN may be local (CSNL) or remote (CSND).
   Analog/Digital subscriber lines are connected to CNs.
   CSNL is connected to the OCB-283 via LRs.
   CSND is connected to the OCB-283 via PCMs.
   UCN is interface between CNs and SMX.
   GTA & all the CNs are connected to the RCX of UCN
    via LRIs.
   GTA is defined as CN-20 to the system.
   CNE’s are connected to the UCN through ICNE.
   Each CNE is connected to ICNE via 1-4 PCM.
    One ICNE can control 20 CNE’s.
   ICNE is connected to connection matrix of UCN via
    max.42 LRI’s.

				
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posted:2/16/2010
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