DOI : 10.17577/IJERTV2IS4505
- Open Access
- Total Downloads : 923
- Authors : Daita Naga Pavan Kumar, M. Nalini Sri
- Paper ID : IJERTV2IS4505
- Volume & Issue : Volume 02, Issue 04 (April 2013)
- Published (First Online): 24-04-2013
- ISSN (Online) : 2278-0181
- Publisher Name : IJERT
- License:
This work is licensed under a Creative Commons Attribution 4.0 International License
Conversion Of 256P Rax To Anrax
1 Daita Naga Pavan Kumar 2M. Nalini Sri
-
B-Tech(IV/IV), Dept. of ECM, K. L. University, Vaddeswaram, A.P, India,
-
Assistant Professor, Dept. of ECM. K.L.University, Vaddeswaram, A.P, India.
ABSRTACT:
The present manuscript deals with the conversion of 256P RAX to AN-RAX and also the installation procedure of 256P RAX to AN-RAX. The 256P RAX uses only 184 lines PSTN subscribers but if we convert it into ANRAX it uses 248 lines PSTN subscribers through V5.2 protocol. The 256P RAX consists of three racks, they are: 1) Power Distribution Panel (PDP), 2)Master Frame & 3)Slave Frame. After the conversion of 256P RAX to AN-RAX we can use the master frame as slave frame and slave frame as master frame, both will be same after the conversion. To do the conversion of 256P RAX some of the cards become redundant and those cards have to be removed. Then the modification will be done for the 256P RAX. The conversion and installation procedure is completely done in five steps. The main objective for converting the 256P RAX we can have the maximum lines for the exchange.
KEY WORDS:
256P RAX, ACCESS NETWORK RURAL AUTOMATIC EXCHANGE (AN-RAX), PUBLIC SWITCHING TELEPHONE NETWORK (PSTN), V5.2
protocol Standard interface between LE and AN, Local Exchange (LE), AN-RAX Controller Card (ARC), AN- RAX Interface Card (ARI).
-
INTRODUCTION:
The C-DOT Access Network – Rax (AN- RAX) will provide the second level of remoting. AN-RAX might be connected to a RSU or directly to the Local Exchange (LE). The AN-RAX
supports V 5.2 protocol, and handles the functionality of second level of remoting.
The second level of remoting has its scope and role clearly defined. At this level there would neither be any intra switching or call processing activities, nor the AN-RAX would handle the charging, billing and administration functions of subscribers.
AN-RAX provides a transparent link between subscriber and LE. It handles the various subscriber events, the BORSCHT (Battery feed, Over voltage protection, Ringing, Supervision, Coding, Hybrid and Testing) functionalities.
All the administration, call processing, charging, billing, traffic monitoring and switching are performed at LE, where AN-RAX plays the role of front end termination at remote end.
The main feature of AN-RAX is that it provides concentration through V 5.2 protocol, which is used as a signaling protocol between LE and AN- RAX. 248 PSTN subscribers can be supported on two E1 links towards LE. This places the AN-RAX at a level higher than a simple MUX , which is used at third level of remoting. The system can work on one E1 link towards LE.The levels of remoting are shown in the figure 1.
Sl.
No.
Cab le marker no.
Signal type name
Source placement frame/connector position.
Destinat ion Placement frame/
connect or position
1
A800
E&M
Master frame3A present)
(if
MDF
2
A801
E&M
Master frame4A present)
(if
MDF
3
A802
E&M
Master frame5A present)
(if
MDF
4
A803
E&M
Master frame6A present)
(if
MDF
5
A804
E&M
Slave frame3A present)
(if
MDF
6
A805
E&M
Slave frame4A present)
(if
MDF
7
A806
E&M
Slave frame5A present)
(if
MDF
8
A807
E&M
Slave frame6A present)
(if
MDF
9
DT01
RDS-
RDC(Pair) Cable
Master frame21A present)
(if
DDF
10
MP00
MPACI
A link
Master frame2A POS1
MP
11
PRD1
-48V
supply
PDT
MP
12
DT02
RWC
cable
Slave frame 10A,S17A (if
present)
DDF
13
DTNS
RNS
trunk cable
RNS(if present)
MDF
14
CLC0 CLK0 SYN0
Clock
& Sync. Output for copy0
RNS(if present)
RAP0
Slot 13
A3 &
13 B3
15
CLC1 CLK1 SYN1
Clock
& Sync. Output for copy1.
RNS(if present)
RAP1
Slot
14 A3 &
14 B3
Sl.
No.
Cab le marker no.
Signal type name
Source placement frame/connector position.
Destinat ion Placement frame/
connect or position
1
A800
E&M
Master frame3A present)
(if
MDF
2
A801
E&M
Master frame4A present)
(if
MDF
3
A802
E&M
Master frame5A present)
(if
MDF
4
A803
E&M
Master frame6A present)
(if
MDF
5
A804
E&M
Slave frame3A present)
(if
MDF
6
A805
E&M
Slave frame4A present)
(if
MDF
7
A806
E&M
Slave frame5A present)
(if
MDF
8
A807
E&M
Slave frame6A present)
(if
MDF
9
DT01
RDS-
RDC(Pair) Cable
Master frame21A present)
(if
DDF
10
MP00
MPACI
A link
Master frame2A POS1
MP
11
PRD1
-48V
supply
PDT
MP
12
DT02
RWC
cable
Slave frame 10A,S17A (if
present)
DDF
13
DTNS
RNS
trunk cable
RNS(if present)
MDF
14
CLC0 CLK0 SYN0
Clock
& Sync. Output for copy0
RNS(if present)
RAP0
Slot 13
A3 &
13 B3
15
CLC1 CLK1 SYN1
Clock
& Sync. Output for copy1.
RNS(if present)
RAP1
Slot
14 A3 &
14 B3
-
EXISTING 256P RAX CONFIGURATION:
The list of cards which become redundant and have to be removed are given in the table below.
Card name
Slot
RAT
M9,M18
RMF
M10,M17
CNF(if present)
M7
RSC
M12,M15,S12,S15
RAP
M13,M14
RDS
M21,S21
RDC
M24,S24
RWC
S10,S17
TWT
Wherever present
EMF
-do-
RDT
-do-
The maintenance panel is also to be removed.
The list of cables which have to be completely removed from the system is given below:-
-
MODIFICATION TO BE DONE ON MOTHERBOARD:
-
Straps On Motherboard
The motherboard of 256P RAX has to be modified to enable installation of AN-RAX.
The master frame will have 20 straps. The list of straps is given in table. The shrouds of slots 12A & 15A will have to be removed for new straps.
The slave frame needs to have only four of the straps mentioned in the table, but all the 20 straps may be done in slave frame to provide inter changeability in future without major effort. The four straps are Sl.No. 17,18,19 & 20 of straps list table.
STRAPS LIST FOR AN-RAX
Sl.No.
Slot.No.Fro
m
Pin No. To.
1
12/Ba8
15/Bc8
2
12/Bc8
15/Ba8
3
12/Ba9
15/Bc9
4
12/Bc9
15/Ba9
5
12/Aa9
15/Ac9
6
12/Ac9
15/Aa9
7
12/Ba2
15/Ba2
8
12/Bc2
15/Bc2
9
12/Ba3
15/Ba3
10
12/Bc3
15/Bc3
11
12/Ba4
15/Ba4
12
12/Bc4
15/Bc4
13
12/Ba5
15/Ba5
14
12/Bc5
15/Bc5
15
12/Ba23
15/Ba23
16
12/Bc23
15/Bc23
17
11/Ac6
16/Bc1
18
11/Ac7
16/Ac9
19
16/Ac6
11/Bc1
20
16/Ac7
11/Ac9
-
Placement Of Precharge Pins
The precharge pins and back panel grounding nuts have to be provisioned in the motherboard so that they make early contact with ARC/ARI cards as they are jacked in.
Two precharge pins have to be placed in each of the slots 12 & 15. These should replace the screws of the slot.
Back panel grounding nuts have to be provisioned on the motherboard for SPC/ISP card slots 11 & 16.
-
Placement of New Shrouds
Two shrouds have to be placed on the motherboard at location 12B & 15B in master frame only. However for inter changeability in the future this can be done on slave frame also.
-
Jumper Setting On Motherboard For Configuring Motherboard For Master/Slave and 128/256 Port Mode
There are two set of 3pin berg stick (Jumper pins) WS3 & WS4 on the back side of 256P RAX motherboard as shown in figure 2. Each motherboard of 256P RAX can be configured for Master/Slave and 128/256 port mode by shorting these pin using shorting stubs.
-
Jumper setting on each motherboard for
256 port mode is to be done as shown below.
As seen from the back side (solder side of motherboard).
-
For 128 port mode, jumper setting is to be done as shown below.
-
-
-
PLACEMENT OF CABLES ON MOTHERBOARD:
-
Back Plane Interframe Cables
The five interframe cables are to be connected between Master and Slave frames.
Sl
.No.
Ca ble Mark er No.
Sour ce Placem ent Connec tor Positio n
Desti nation Placeme nt Connect or Position
Cable Descripti on.
1
IF C0
Mast er frame 12A,
Pos II
Slave frame 12A,
Pos II
2 × 7
Flat cable connecto r
2
IF C1
Mast er frame 12A,
Pos I
Slave frame 12A,
Pos I
-do-
3
IF C2
Mast er frame 15A,
Pos II
Slave frame 15A,
Pos II
-do-
4
IF C3
Mast er frame 15A,
Pos I
Slave frame 15A,
Pos I
-do-
5
IF C4
Mast er frame 2B, Pos I
Slave frame 2B, Pos I
-do-
Sl
.No.
Ca ble Mark er No.
Sour ce Placem ent Connec tor Positio n
Desti nation Placeme nt Connect or Position
Cable Descripti on.
1
IF C0
Mast er frame 12A,
Pos II
Slave frame 12A,
Pos II
2 × 7
Flat cable connecto r
2
IF C1
Mast er frame 12A,
Pos I
Slave frame 12A,
Pos I
-do-
3
IF C2
Mast er frame 15A,
Pos II
Slave frame 15A,
Pos II
-do-
4
IF C3
Mast er frame 15A,
Pos I
Slave frame 15A,
Pos I
-do-
5
IF C4
Mast er frame 2B, Pos I
Slave frame 2B, Pos I
-do-
The connection details are shown in fig 3.
-
Digital Link Cable
Digital link cable terminates two E1 links on the ARC card in one of the copies of Master frame. The other end of the cable is terminated on the DDF (Digital Distribution Frame).
The details of the cable is given in table below.
Ca ble Mark er
Sourc e Connect or Position
Type
Destin ation Position
T
ype
DT C1
Mast er frame 12B
Pos-I or Master frame 15B
Pos-I
7 × 2
single module connect or
Digital Distributi on Frame
B
are Wir e
The connection details are shown in figure 4.
-
Dumb Terminal Cable
The dumb terminal cable is terminated on ARC card in slot 13B & 2A in Master frame.
The details of cable is given in the table below.
Ca ble Mark er No.
Sourc e Connect or Position
Typ
e
Destin ation Connecto r Position
Type
SD T0
Maste
r frame 2A Pos-I & 12B Pos-III
7×2
Single Modul e Cable
Dumb Terminal RS232-C
connector
25-
Pin D- type connect or
The cable details and connector position on Master frame are shown in figure 5.
NOTE: Before switching on the dumb terminal, it should be well checked that the earthing of the AC main supply and AN-RAX have been properly done.
-
-
NEW HARDWARE:
-
NEW CARDS
The new hardware card for AN-RAX are listed in the table below:-
Card Name
Positions
AN-RAX Controller Card (ARC)
M12 & M15
AN-RAX Interface Card (ARI)
S12 & S15
The new hardware configuration is shown in
figure 6.
FIG. 6: AN-RAX CARD FRAME CONFIGURATION
TC: Termination Card i.e. LCC or CCM
-
NEW CABLES
The ARC & ARI cards are connected by 60 pin flat cable from the front of the cards as shown in fig.7.
The cable connection details are in table below.
Sl.No.
Cable Marker
Source Placement Position
Destinati on Connector Position
1
ACI 0
ARC FRONT,
Master Frame slot 12
ARI FRONT,
Slave Frame slot 12
2
ACI 1
ARC FRONT,
Master Frame slot 15
ARI FRONT,
Slave Frame slot 15.
-
-
MAPPING OF L3 ADDRESSES TO AN-RAX HARDWARE SLOTS:
Sl.No.
Card Slot
L3
Addresses
1
1-3
101-108
2
1-4
109-116
3
1-5
117-124
4
1-6
125-132
5
1-7
133-140
6
1-8 Note 1
141-148
7
1-9
149-156
Sl.No.
Card Slot
L3
Addresses
1
1-3
101-108
2
1-4
109-116
3
1-5
117-124
4
1-6
125-132
5
1-7
133-140
6
1-8 Note 1
141-148
7
1-9
149-156
The mapping L3 addresses as defined at LE and AN to the actual hardware port of line cards is shown in the table below. It is being assumed that the start L3 address is 101 and all 248 possible subscribers are present.
8
1-10
157-164
9
1-17
165-172
10
1-18
173-180
11
1-19
181-188
12
1-20
189-196
13
1-21
197-204
14
1-22
205-212
15
1-23
213-220
16
1-24
221-228
17
2-3
229-236
18
2-4
237-244
19
2-5
245-252
20
2-6
253-260
21
2-7
261-268
22
2-8
269-276
23
2-9
277-284
24
2-10
285-292
25
2-17
293-300
26
2-18
301-308
27
2-19
309-316
28
2-20
317-324
29
2-21
325-332
30
2-22
333-340
31
2-23
341-348
32
2-24
349-356
NOTE: If an RTC card is placed in the slot, leave the corresponding 8 L3 addresses in sequence. The 8 L3 addresses should not be given to any subscriber. They should not be made in service at AN.
NOTE: If the start L3 address programmed at LE is 201, then the L3 address of slot 1-3 will begin from 201, slot 1-4 will begin 209 and so on.
-
CONCLUSION:
The 256P AN-RAX is ideal for rural applications since it provides immediate basic telephone connections with minimal infrastructure. It is an easy to install fault-tolerant system with inbuilt redundancy.
Communication has forever been a problem in villages of the world. The world, as we know it, has been progressing rapidly, leaving these villages bereft of substantial social and economic gains.
The 256P AN-RAX from C-DOT is a world class cost-effective communication solution for rural areas. Development with the sole purpose of transforming the villages by removing natural barriers to progress through its versatility in any environment hot tropical areas, subzero mountainsous regions, vast deserts and costal areas, the 256P AN-RAX is an Access Network product.
Besides requiring no air-conditioning, it can withstand dust, wide temperature fluctuations (-50 C to 500 C), humidity and salinity. Moreover, it
consumes very little power, sustaining itself despite frequent power failures due to low battery drain.
A distinguishing feature of the 256P AN-RAX is its simple and flexible connectivity through a wide range of transmission systems such as UHF, VHF, radio and satellite.
Because it is program-controlled it can be easily integrated as per the network requirements through man-machine commands, thus providing to be an extremely cost-effective and viable proposition.It can also assist in the setting up of service centers in any country that imports its technology and provide training to their technicians with the objective of making themselves reliant in handling technical problems.
REFERENCES:
-
C-DOT SYSTEM & PRACTICES USER MANUAL.
-
JTO PHASE C-DOT VOLUME-2
-
AN-RAX from Wikipedia
-
256P RAX from C-DOT website.
-
SWITCHING CONCEPTS from Wikipedia.
AUTHORS BIBILOGRAPHY:
-
DAITA.NAGA PAVAN KUMARwas born in 1991 at
Krishnal district, Andhra Pradesh. He is pursuing B.TECH in Koneru Lakshmaiah University,Guntur. His interested areas are Embedded Systems and VLSI.
2.M.Nalini Sri was born in Andhra Pradesh. She is working as a Assistant Professor, Dept. of ECM, K.L.University, Vaddeswaram, A.P, India.
Manuscript Details:
DaitaNaga Pavan Kumar Electronics and Computer Engineering,,K L University, Guntur, Krishna Dt, Andhra Pradesh, India.
Ph.no:8121142055 (email:daita1992@gmail.com)
-
Prof.M.Nalini Sri, Electronics and Computer Engineering, K L niversity, Guntur, Krishna Dt, Andhra Pradesh, India, (email:nalinisriecm@kluniversity.in)