02_Networking and Configuration of telecom.ppt

Networking and configuration

2. Agenda
•Networking Mode
•Traffic Calculation
•Dimensioning & Configuration

3. Networking Mode
SM
Single Module
CM
SM SM
SM
SM SM
Networking with SM as central
SM SM
Networking with CM as central
Note:
SM can be used independently. But CM can not.
SM carries RSU, but CM does not.
PSM (Peripheral Switching Module) : uses FBI
board as the uplink to the upper module
RSM (Remote Switching Module): uses DTI/ODT
board as the uplink to upper module
FBI DTI/ODT
DTI/ODTFBI

4. Networking Mode
•Single Module
–SM16, SM8, SM4C, SM4I
•SM as central
–SM16, SM8
•CM as central
–CM256, CM128, CM64, CM32
•PSM
–SM16, SM8
•RSM
–SM16, SM8, SM4C

5. Inter-office Trunks
–SDT board
•STM-1 interface
•Bandwidth: 155M=63 E1
–E1
•DTI: 4 E1 links; MDT: 16 E1 links
•Bandwidth : 2M

6. Inter-module Trunks-1
–FBI board
•Used between PSM and its host module
•Inter-module trunks: 16 * 8M =16*128=2048DT
–ODT board
•Used between RSM and its host module
•Inter-module trunks : 4*8M=4*128=512DT
–E1
•Used between RSM and its host module
•DTI: 4 E1 ports; MDT: 16 E1 ports
•Inter-module trunks : n*2M= n* 30 DT
–Built-in SDH
•Inter-module trunks: 155M=63*2M

7. Inter-module Trunks-2
–Transmission equipments provided by operators
•DTI, MDT
–No transmission equipment. But modules are very
near, <2Km
•FBI, ODT
–Modules are far away each other. But operators
provide optical fabric
•ODT, FBI, Built-in SDH

8. Agenda
•Networking Mode
•Traffic Calculation
•Dimensioning & Configuration

9. Traffic Calculation (1)
SM
Single Module
Formula: N
L*T
1*x%<N
T*T
2
N
L
: Subscribers
T
1
: Traffic per subscriber
N
T
: Trunks
T
2
: Traffic per trunk
X: percentage of out-going calls
Example:
How many trunks are needed for
an office which has 5000 lines a
nd 80% calls are out-going calls?
In addition, the traffic is 0.1 Erl
per line, 0.8 Erl per trunk?
Answer:
Trunks = 5000*0.1*0.8/0.8=500
E1s= ceiling( 500/30,1) =17

10. Traffic Calculation (2)
2. For PSM/RSM at the bottom
N
L
*T
1
*X
1
%+N
T
*T
2
*X
2
%< N
B
*T
3
N
L
: Subscribers
T
1
: Traffic per subscriber
N
T
: Inter-office trunks
T
2: Traffic per inter-office trunk
N
B
: Inter-module trunks
T
3
: Traffic per inter-module trunk =1
3. For PSM/RSM in the middle
N
L
*T
1
+N
T
*T
2
+ ∑SM
i
< N
B
*T
3
N
L
: Subscribers
T
1
: Traffic per subscriber
N
T
: Inter-office trunks
T
2
: Traffic per inter-office trunk
N
B
: Inter-module trunks
T
3
: Traffic per inter-module trunk =1
SM: the traffic of the lower-level modules, i=1,2,3…
CM
SM SM
SM
SM
DTI/ODTFBI
Multiple modules
SM
1. For office
N
L*T
1*X%<N
T*T
2
N
L
: Subscribers
T
1
: Traffic per subscriber
N
T
: Trunks
T
2
: Traffic per trunk
X: percentage of out-going calls

11. Example
A
C
E
B
D
Question:
There is a project including 5 sites. Accordi
ng to their geographical location, a 3-level n
etworking is proposed as shown in the pictu
re. The capacity of each sites are:
Site A: 5000L
Site B: 3000L plus 20 E1 trunks for inter-o
ffice connection
Site C, D: each having 2000L.
Site E: 800L
Traffic: 0.1Erl per line; 0.8Erl per inter-offic
e trunk; 1 Erl per inter-module trunks
70% calls are out-going calls
Plz, calculate how many inter-office trunks a
re increased in site A and how many inter-m
odule trunks are needed between modules.
Answer:
1. Total inter-office trunks = (5000+3000+2*2000+800)*0.1/0.8*70%/3
0 = 1120/30 =38 E1
So, another 38-20=18 E1 should be increased in site A for inter-office co
nnection.
2. Inter-module trunk between A and C, D and B
Trunks = 2000*0.1/1=200
So, 1 ODT or 7 E1 are used
3. Inter-module trunk between E and B
Trunks = 800*0.1/1=80
So, 1 ODT or 3 E1 are used
3. Inter-module trunk between B and A
Traffic of B = 3000*0.1+20*30*0.8= 780 Erl
Inter-module trunks = (780+200+80)/1 = 1060
So, 1 pairs of FBI are selected

12. Agenda
•Networking Mode
•Traffic Calculation
•Dimensioning & Configuration

13. A Complete Configuration
•Equipments
•Software
•OAM computers
•MDF, DDF, Rectifier, Battery
•Summary

14. SM4I
•Application
–Only used in single-module networking
•Typical configuration
•Subs. + trunks: 720L+720DT

15. SM4C
•Application
–Used in single-module networking
–Used as RSM in multi-module networking
•Typical configuration
–In single-module networking
•Single rack: 2400L+600DT
•Two racks: 5280L+600DT

16. SM8
•Application
–Used in single-module networking
–Used as PSM/RSM in multi-module networking
•Typical configuration
–In single-module networking
•Subs.+ trunks: 12480L + 2760DT
•Only trunks: 6240DT
–As PSM/RSM in multi-module networking
•Subs.+ trunks: 9600L+1200DT
•Only trunks: 2880DT

17. SM16
•Application
–Used in single-module networking
–Used as PSM/RSM in multi-module networking
•Typical configuration
–In single-module networking
•Subs. + trunks: 15360L + 9600DT
•Only trunks: 14400 DT or 7 STM-1
–As PSM/RSM in multi-module networking
•Only trunks: 7680DT, or 4 STM-1

18. Multi-module Networking
Model as
Central Module
Capacity
Lines/Trunks
CM256 1,000K/250K
CM128 800K/120K
CM64 605K/60K
CM32 298K/30K
SM16 148K/14K
SM8 70K/7K

19. Model Selection
Project requirement:
•The capacity of office: 12800 Lines + 1120DT
•Site B: 3K lines + 600DT(Inter-office) + 280DT (Inter-module)
•Site C, D: 2K lines + 200DT (Inter-module)
•Site E: 800 lines + 80 DT (Inter-module)
Solution:
If the future expansion is not considered in this project, the
equipment model for each site is:
Site A: SM8
Site B: SM8
Site C, D: SM4C
Site E: SU960/SU960N

20. Battery Dimensioning
Two sets of batteries usually are required
Calculation:
Maximum current of ZXJ10 exchange is 140A
On 4 hours reserve basis (MF=K*4,taken as
5.22)
The battery capacity is 800Ah
(140*5.22=730.8Ah)
Two sets of 400Ah batteries will be used

21. Battery Configuration
•Requirement
–Site A: 2645W, 56A
–Site B: 1795W, 38A
–Site C,D: 1170W, 25A
–Site E: 450W, 10A
•Calculation
–Site A: 56*5.22=288, two sets of 150Ah
–Site B: 38*5.22=196, two sets of 100Ah
–Site C,D: 25*5.22=128, two sets of 65Ah
–Site E: 10*5.22=49, two sets of 50Ah

22. Rectifier Dimensioning
N+1 backup is required usually
Calculation:
Dimensioning and Configuration of rectifier equipment
Maximum current of ZXJ10 exchange is 140A
Total equalizing charge current of the two battery sets is 80A (re-
charge the batteries at 10 hours rate)
The rated output current of rectifier = 140A+80A=220A
No. of rectifier units (30A)=220/30=8
For N+1 configuration, the number of rectifier units will be 9
Therefore, one ZXDU300 rectifier cabinet, which can
accommodate up to ten 30A-rectifier units, will be provided

23. Rectifier Configuration
•Battery is recharged at 10 hour rate
•Site A: (56+300/10)/30=3, 4
•Site B: (38+200/10)/15=4, 5
•Site C,D: (25+130/10)/15=3, 4
•Site E: (10+100/10)/15=2,3