BHARAT SANCHAR NIGAM LTD. TRANSMISSION
TEST SCHEDULE SDH / STM-1/4/16/MADM O.F. System
T&D CIRCLE, JABALPUR
TEST SCHEDULE
STM-1/4/16/MADM OPTICAL FIBRE SYSTEMDocument No. (TD/LG/2382/SDH/G/COLL.III)
No of Pages. 10
Issue No. 01
Issued By: T&D Circle Jabalpur.
Approved by: CGM T&D Circle Jabalpur.
Date of Issue: 23-12-2008
Amendment No. (If any)
No of Pages
Issue No.
Issued By: T&D Circle Jabalpur.
Approved by: CGM T&D Circle Jabalpur.
Date of Issue:
Restricted use by BSNL Employees only
“FIX IT RIGHT FOR THE FIRST TIME”
BHARAT SANCHAR NIGAM LIMTED
OFFICE OF THE CHIEF GENERAL MANAGER
TECHNICAL AND DEVELOPMENT CIRCLE
JABALPUR
TEST SCHEDULE FOR SDH/STM-1/4/16/MADM OFC SYSYTEM
PART-A
INFRASTRUCTURE TEST
S. No. / TEST DESCRIPTION / OBSERVATION / TEST PROCEDURE/REFERENCE / REMARKS1. . / Location Alignment and Rigidity (LAR) / As per approved Layout plan
2. / Raised floor and False Ceiling or Antistatic flooring (As provided)
3. / Illumination and Power outlets
4. / Check of Earthing system / Earth resistance value should be
< 0.50 ohm. / As per E.I. No. I-001 Protection Earthing.
5. / Check of Environmental condition / i) Temperature between 22 to 25 degree C. ii) Relative Humidity RH : 40% to 60%
6. / QA certification of all equipment / For imported items refer to QA Test results from vendor
7.. / Check of Documentation / As per P.O.
8. / Hardware Conformity / Software/ Conformity / As per P.O.
To be checked for licensing
9. / *Power plant / As per T&D Test Schedule in case of new Power Plant
10. / *Battery / As per T&D Test Schedule in case of new Battery.
S. No. / TEST DESCRIPTION / OBSERVATION / TEST PROCEDURE/REFERENCE / REMARKS
11. / *Engine Alternator / As per T&D Test Schedule
12. / Check of Fire fighting Equipt / Fire Detection system / As per T&D Test Schedule
13. / Voltage drop / <1 Volt (Voltage drop from Battery terminal to Equipt input )
14. / Sign. Writing
Note: * If existing, then earlier A/T clearance to be shown and adequacy as per present load requirement to be ascertained.
PART – B
LOCAL TEST
Name of Route :
Station : Date of Testing:
Bay Code and Serial No. Operating Wave Length: 1310 nm / 1550 nm
Make : Fibre Number Used :
Capacity :
S. No. / Parameter / Measurement / Limit1. / Check of Power Supply and its distribution / - 40 to – 60 Volts (-51 Volts Nominal)
1.1 / D.C. Mains distribution to equipment
1.2 / Check Of Derived Voltage
2. / SDH Test On Optical Interface
2.1 / Optical Mean Launched Power Measurement / For L1.1 (0 to –5 dBm)
For L4.2 (+2 to –3 dBm)
For L16.2 (+3 to –2 dBm)
2.1.1 / Laser Bias Current / Less than 80 mA.
2.2 / Check of Receiver Sensitivity / Dynamic Range
2.2.1 / Receiver Sensitivity
(To be checked for all optical ports ) / For L1.1 (-34 dBm or better)
For L4.2 (-28 dBm or better)
For L16.2 (-27 dBm or better)
2.2.2 / Minimum Overload Power Measurement / For L 1.1 –10 dBm
For L 4.2 –8 dBm
For L 16.2 –9 dBm
2.2.3 / Dynamic Range / For L1.1 (24 dB or better)
For L4.2 (20 dB or better)
For L16.2 (18 dB or better)
2.3 / Check of Laser Safety
2.3.1 / Manual Re-start
2.3.2 / Automatic Laser Shutdown
3. / Measurement of Bit Rate on Electrical Interface
3.1 / Bit Error Rate Tolerance ± ppm
2 Mb/s 50 / No Error
34 Mb/s 20 / No Error
140 Mb/s 15 / No Error
155 Mb/s 20 / No Error
622.08 Mb/s 20 / No Error
S. No. / Parameter / Measurement / Limit
3.2 / Combined Jitter From Tributary Mapping / HP1+ LP
3.2.1 / Bit Rate 2 Mb/s / F1-F4 0.4 UI (HP1+LP)
F3-F4 0.075 UI (HP2+LP)
4. / Test for Ethernet Interfaces
4.1 / Types of Ethernet Ports : 10BaseT, 10/100 BaseT, 100 Base Fx, 1000Base T, 1000 Base Fx
In case of 100Base Fx, 1000 Base Fx
a. Laser Window : 1310 nm / 1550 nm
b. Trans. Power
c. Auto Laser Shutoff : Ok / Not Ok / -8 to –15 dbm
4.2 / No. of Ethernet ports available
4.3 / Check for network accessibility
4.4 / Cross connection details w. r. t. Ethernet ports
4.5 / Check for proper configuration details w. r. t. Ethernet ports -
a. Ethernet class of interface : Ethernet Port
b. Protocol used : Generic Framing Procedure (GFP)
c. Ethernet Flow Control : Enable
d. Link Capacity Adjustment Scheme (LCAS) : Enable
4.6 * / a. Throughput test
b. Latency test
c. Packet (frames) Loss rate test
d. Back to Back frames test
4.7 / Alarms w.r.t Ethernet ports -
a. Ethernet port Link down.
b. Loss of Capacity.
c. Partial Loss of Capacity
d. VCC Link down
e. Client Signal failure
f. Far End Client Signal failure
5 / MADM Applications
A) Map one E1 with each aggregate line card and measure BER
B) Map one STM-1 tributary with each aggregate line card and measure BER
C) Create cross connection among all four aggregate ports(two at a time) on STM-1 & E1 level and measure BER / No error
No error
No error
* Note :- For Test No.4.6 Ethernet Tester is required
PART – C
THROUGH TEST
Station: Date. of Testing
S. No. / Parameter / Measurement / Limit1. / Optical Receive Power Measurement
a) With Power Meter
b) With LCT / For L1.1 (-28 dBm or better)
For L4.2 (-22 dBm or better)
For L16.2 (-21 dBm or better)
2. / BER Measurement Tolerance
Bit Rate (±ppm) / Error Value
2 Mb/s 50 / No Error
34 Mb/s 20 / No Error
140 Mb/s 15 / No Error
155 Mb/s 20 / No Error
622.08 Mb/s 20 / No Error
3. / AIS Clock Frequency: Measurement / 2048 KHz ± 102 Hz
4. / Output jitter Measurement
Bit Rate
2 Mb/s / F1-F4 0.75 UIPP F3-F4 0.2 UIPP34 Mb/s / F1-F4 0.75 UIPP F3-F4 0.15 UIPP
140 Mb/s / F1-F4 0.75 UIPP F3-F4 0.075 UIPP
155 Mb/s / F1-F4 0.75 UIPP F3-F4 0.075 UIPP
622.08 Mb/s / F1-F4 0.75 UIPP F3-F4 0.075 UIPP
5. /
Input jitter Tolerance Measurement
2 Mb/s / F1-F4 1.5 UIPP F3-F4 0.2 UIPP34 Mb/s / F1-F4 1.5 UIPP F3-F4 0.15 UIPP
140 Mb/s / F1-F4 1.5 UIPP F3-F4 0.075 UIPP
155 Mb/s / F1-F4 1.5 UIPP F3-F4 0.075 UIPP
622.08 Mb/s / F1-F4 1.5 UIPP F3-F4 0.075 UIPP
S. No. / Parameter / Measurement / Limit
6. /
Test for Ethernet Interface. **
a. Through put testb. Latency test
c. Packet (frames) Loss rate test
d. Back to Back frames test
7. / Check of Order Wire:
7.1 / Selective Calling (List of Order wires no. to be attached)
7.2 / Omnibus Calling
8. / Check of Synchronization: with PRC Source #
8.1 / External Clock Measurement / 2048 KHz ± 4.6 ppm
8.2 / Tributary Clock Measurement / 2048 Kb/s ± 50 ppm
8.3 / Holdover Mode
9. /
Check of Protection Switching
9.1 / Path Protection Switching / Check that after protection Switching. AIS is restored9.2 / Equipt. Protection Switching
9.3 / Order wire Function (After Switch over)
10. / Network Management System (NMS) (Applicable only for NMS stations)
10.1 / Performance Monitoring
10.2 / Configuration Management
10.3 / Security Management
11. / Craft Terminal ( For Local & Remote )
11.1 / Performance Monitoring
11.2 / Configuration Management
11.3 / Security Management
12. /
Alarms
12.1 / Alarms Namea. FERF
b. AIS
c. LOP
d. MS
e. LOS
f. LOF
13. / Error Performance (Stability Test) (48 hrs. continuously)
13.1 / Bit Rate
2 Mb/s / Limit at 64 Kb/s
DM : 0.023 %
ES : 0.018 %
SES : 0.00023 %
Note: Limits are given for length of 280 kms. of fibre.
** For Test item 6. Ethernet Tester is required.
# Tracing of the Sync path to be indicated.
ANNEXURE
BHARAT SANCHAR NIGAM LIMITED
OFFICE OF THE CHIEF GENERAL MANAGER T&D CIRCLE JABALPUR
Procedure for SDH OFC system for SDH/STM-1/4/16
LOCAL TEST
(1) SDH.TEST ON OPTICAL INTERFACE.
2.1 Check of optical mean launched power
THE TEST SET UP IS SHOWN BELOW:-----
Fig. 1
1.1 OPTICAL POWER MEASUREMENT ON PC/LCT :--
(a) OPTICAL POWER
(b) LASER BIAS CURRENT
NOTE: POWER SHOULD BE MEASURED WITH ALS( AUTOMATIC LASER SHUT DOWN
INHABITED WITH THE HELP OF PC ) i.e. OPTICAL POWER IS IN FORCED ON CONDITION.
2.0 CHECK OF RECEIVER SENSITIVITY/DYNAMIC RANGE :-
The test set up is given in fig. 2 below:-
FIG. 2
3. CHECK OF LASER SAFETY :LIMIT :TX POWER SHOULD COME DOWN TO 10 db with respect to measured trans power (it should be below –10 dBm)
The above test may be conducted with the help of software if available with the system under test.
4.0 MESUREMENT OF BER ON ELECTRICAL INTERFACE:
Measure the BER at electrical interface as per procedure given in the diagram 3 given below:-
FIG. 3
5.0 COMBINED JITTER FROM TRIBUTARY MAPPING :- Make the test set up as given in fig.4 below.
Now vary the bit rate tolerance of 2 Mb/s pay load as applicable (i.e. 50 ppm) & measure the output jitter. Measure the output jitter & check for it being in the limit.
REFERENCE CLOCK
FIG 4
DTA IS WORKINGON INTERNAL CLOCK
THROUGH TEST
1.0 Optical receive power: Optical receive power should be measured with the help of power meter and craft terminal and observations are to be recorded.
2.0 BER Measurement
3.0 AIS CLOCK FREQUENCY MEASUREMENT:-
Measure the AIS frequency on any two 2 Mb/S tributaries.
2.0 Output Jitter Measurement (with mapping): Feed the 2/34/140 Mb/s PRBS signal
3.0 (without jitter) from DTA transmitter to the tributary input of the SDH
4.0 equipment under test. Now measure the output jitter for the tributary mapped
5.0 by SDH system with the help of DTA Rx as shown in fig.5 by selecting suitable
6.0 filters. The output jitter should be within the limits given below. Repeat the
7.0 test for other tributaries also.
2/34/140
2/34/140 Mb/S
Mb/S
STATION A STATION B
FIG 5
5.0 INPUT JITTER TOLERANCE (With mapping): Feed 2/34/140 Mb/s signal modulated
6.0 by sinusoidal jitter frequency from DTA transmitter to the tributary input
7.0 of SDH equipment. Set the jitter frequency as per table below & increase
8.0 the jitter level till error appears in DTA receiver. Note down the maximum
9.0 jitter amplitude corresponding to no error, condition. Repeat the above
10.0 procedure with clock offset also as applicable for bit rates.
6.0 Check of O/W :
(i) O/W may be tested up to BER 1x10-3 for speech and signalling by attenuating the power by inserting optical pads.O/W should be able to work when BER is upto 1x10-3
7.0 Check of Synchonisation :
Check that master station/node is synchronised with Cesium or Rubidium clock or from the clock of nearby TAX. Other nodes may be synchronised with the clock extracted from incoming tributaries.
8.0 Check Of Protection switching :Put the system on PPS and record the time of AIS Restored.
9.0. ALARMS: As per manufacture’s guidelines.
10.0 ERROR PERFORMANCE (STABILITY TEST):
System should meet the following limits at Bit rate of 64Kb/s for test duration of Available time of 48 hours continuously.
These limits are given for HRDS length of 280 KM. If a real digital section under test is longer than HRDS length of 280 Km ,its overall allocation should correspond to that of integer number of HRDS,the combined length of which are atleast as long as the real digital section length. If a real section is shorter than 280 Km ,there will be no reduction of bit error allocation.
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O/o CGM T&D CIRCLE JABALPUR Issue 5, Dt. 23-12-2008