i) Several fiber links in the Gazipur sub-center were frequently down for extended periods over the last 3 weeks due to ongoing construction activities like road expansion works, electric pole shifting, and flyover construction. ii) The construction works involved cutting of overhead fibers by excavators, breaking of poles supporting overhead cables, and restrictions on worker movement during repairs. iii) An action plan was made to shift some overhead cables to newly installed poles and deploy new underground fiber for more stable connections. Continuous communication with construction authorities was also emphasized to reduce outages during future works.

1. Frequently Down Link Survey Report
Gazipur Sub-Center
Summit Communications Limited

2. Frequently Down Link Survey Report, Gazipur Sub-Center
Last 3 Weeks Network Availability Report Under Gazipur Sub-Center
Week Link Name Duration Reason
W1
GPSDR22 to
GPSDR09 3.32
OH fiber cut by third party
GPSDR37 to
GPKLK04-
PAGG 2.37
OH fiber cut by excavator during road
expansion work by R&H authority
GPSDR22 to
GPSDR49 3.29
Core problem
GPSDR35_2-
AGG to
GPSDR10
5.86
Fiber cut by e/p broken near Shimultoli-
Shalna Railgate. Delayed due to PDB
activity.
PUBAIL-HO to
GPSDR06
9.38
Fiber stolen at Boshugao. Delayed due
to another link rectification and police
restriction
W2
GPSDR35_2-
AGG to
GPSDR10
2.52
Fiber burnt by X-FORMER blast, delayed as
DESCO was working
GPKLK13 to
GPKLK11
11.74
Core problem. Delayed due to OTDR
machine problem
GPSDR39 to
GPSDR60 0.93
Single core break
GPSDR20 to
GPSDR57 2.69
Single core break
PUBAIL-HO to
GPSDR20 2.83
Fiber cut due to city corporation activity
Week Link Name Duration Reason
W3
GPSDR40 to
GPSDR11
3.53
Singlr core break due to high tension
GPSDR22 to
GPSDR49
7.93
Fiber core problem. Delay due to team was
engaed at another link.
GPKLK10 to
GPSDR09
3.88
OF cut by electric pole broken. Delay due to
dependency on new pole installation of by
power authority.
GPKLK04-PAGG
to GPSDR37-
Ring103 and
GPKLK04-PAGG
to GPSDR40-
Ring104 and
GPKLK04-PAGG
to Savar-POP
and GPKLK04-
PAGG to
GPSDR35-AGG
13.18
All the OH fiber cut by R&H authority during
flyover constructions work and Electric pole
shifting by power authority at Konabari. Delay
due to restrictions of Police, R&H authority.
GPKLK04-PAGG
to GPSDR35-
AGG and
GPKLK04-PAGG
to Savar-POP
3.92
All the OH fiber cut by power authority during
Electric pole shifting at Konabari. Delay due to
restrictions of power authority.
GPKLK10 to
GPSDR09
1.93
OF cut by third party during their maintenance
activity.

3. Frequently Down Link Survey Report, Gazipur Sub-Center
Reason For Outage:
i) Road expansion work ongoing.
ii) Electric pole shifting ongoing by power
authority.
iii) Flyover construction work ongoing at
Konabari area.
Link Name:
i) GPKLK04-PAGG to GPSDR35-AGG
ii) GPKLK04-PAGG to Savar-POP
iii) GPKLK04-PAGG to GPSDR40
iv) GPKLK04-PAGG to GPSDR37
Photo-2: Flyover construction workPhoto-1: Electric pole shifting ongoing
Road
crossing
cable
Action Plan:
i) We have shifted our OH cable to
newly installed electric pole on the
another side of road to avoid road
crossing.
ii) Deployed approx. 1 KM new OF for
each link.
iii) For the remaining portions, we
guided to vendor team to follow-up
on R&H and Power authority’s
activity.
Photo-3: Road expansion & Flyover
constructions work at the same place at
Konabari.
Photo-4: We have shifted OH cable to this
newly installed electric pole.
Newly
installed
E/P

4. Frequently Down Link Survey Report, Gazipur Sub-Center
Action Plan:
i) We have shifted our OH cable to newly
installed electric pole. A few portions
is pending due to dependency on
completion of R&H and Power
authority activities. After completion
of power authorities activity, we will
shift another portions of OH cable to
newly deployed electric pole.
Reason For Outage:
i) Power authority & R&H cut all the OH
cable during electric pole shifting and
transformer installation.
ii) They are doing this activity in daily
basis.
Photo-5: Electric pole shifting & Flyover constructions work ongoing at the remaining portions of
GPKLK04 to GPSDR35, GPKLK04 to GPSDR40 and GPKLK04 to Savar POP link. We will shift OH cable
from old pole to new pole after completion of power authorities activity.
Old
electric
pole with
our OH
cable
Newly
installed
pole
Link Name:
i) GPKLK04-PAGG to GPSDR35-AGG
ii) GPKLK04-PAGG to Savar-POP
iii) GPKLK04-PAGG to GPSDR40
iv) GPKLK04-PAGG to GPSDR37

5. Frequently Down Link Survey Report, Gazipur Sub-Center
Action Plan:
i) We have deployed approx. 1.2 KM
new OF recently to improve fiber
conditions.
ii) We will shifted our OH cable from old
electric pole to newly deployed pole.
iii) We are maintaining continuous
communications with power authority
to follow-up their activities. Thus we
can reduced the outage time.
Reason For Outage:
i) OH cable’s conditions is not
satisfactory.
ii) R&H and Power authority cut all the
OH cable from pole during electric
pole shifting and Flyover constructions
activity.
iii) Maintenance/Rectifications being
delay due to River crossing cable.
Photo 1-2: River crossing OH cable of ‘GPSDR40 to GPSDR11’ link
River
crossing
OH cable
Old
Electric
pole
Newly
deployed
pole
Link Name:
i) GPSDR40 to GPSDR11
Photo: 1
Photo: 2

6. Frequently Down Link Survey Report, Gazipur Sub-Center
Action Plan:
i) We have shifted OH cable to
newly installed pole for the
completed portion of pole
shifting.
ii) Permanent solutions is not
possible at this time due to R&H
and Power authority not
completed their activity.
Reason For Outage:
i) Electric pole shifting ongoing at
Konabari area due to road
expansion work in daily basis.
ii) OH fiber cut several times by R&H
and power authority during their
activity.
Photo 3-4: Shifted OH cable of ‘GPSDR40 to GPSDR11’ link
Link Name:
i) GPSDR40 to GPSDR11.
Photo: 3
Photo: 4 Photo: 5
Old
E/P
New
E/P
Old
E/P
New E/P
with our
OF
Pole
shifting
ongoing for
another
portion
Photo 5: Pending area of pole shifting. Work ongoing by daily
basis

7. Frequently Down Link Survey Report, Gazipur Sub-Center
Action Plan:
i) We need new fiber to stable this
link by improving cable conditions
and reducing TJ.
ii) OH cable laid and fixed as possible
better way.
iii) Used medicine to avoid core cut
by Ant.
Reason For Outage:
i) OH cable conditions is not
satisfactory. Also Enormous
numbers of TJ exists at this link.
ii) Due to inadequate numbers of
electric pole OH cable laid
through the Trees. Thus the OH
cable cut frequently during Tree
cutting, Windy weather and
several times core cutting by Ant
inside of TJ box..
Photo 1-2: OH cable laid through the Trees due to inadequate numbers of electric pole
Link Name:
i) GPSDR49 to GPSDR22
Photo: 1 Photo: 2
Our OH cable
through Trees
Absence of
electric
pole

8. Frequently Down Link Survey Report, Gazipur Sub-Center
i) R&H activity ongoing by daily basis.
ii) During road expansion Power authority also shift old electric pole to new pole. Its also ongoing by daily basis.
iii) Due to road expansion and Flyover constructions activity at Konabri, Team surviving heavy traffic jam from
‘Gazipur chowrasta to Konabari’ and ‘Vogra bypass road to Konabari’ road. Thus the Team movement being
delay. Most of the frequently down links are on these way.
iv) OH cable condition is not satisfactory for some links.
v) There was also river crossing OH cable for GPSDR40 to GPSDR11 link. Which required more time during any
rectifications. To reduce rectifications time we have done a meeting regarding smooth operations such as
quick response by field team after getting SMS from NOC, Reducing the repeated link down, Separate team
for Day & Night schedule with our OH vendor JF optical services Ltd.
Common causes for the frequent link down and delay rectifications for last 3 weeks:

9. Frequently Down Link Survey Report, Gazipur Sub-Center