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.