BT Private Circuits hand-over document
1 Mbit/s Hand-Over
Document
About this guide
Figure 1
You will now be in possession of your new MegaStream 1
Private Circuit. This document gives you an overview of your
service equipment together with basic fault finding and
guidelines on how to report a fault.
The diagram below shows the stand-alone network
terminating equipment that you will see on your premises.
The equipment that you will see
The Network Terminating Equipment (NTE 51A) is a
standalone unit that is your BT network-terminating unit. It
can be installed in a variety of ways including desktop
mounted, wall mounted or cabinet mounted in a stacker unit.
The NTE 51A interfaces between your X.21 or G.703
interface from your customer equipment (CPE), and High bitrate Digital Subscriber Line (HDSL) from the Line Terminating
Equipment.
Please don’t touch the connections to the BT network, as you
may set off remote alarms within the BT network.
LED Panel
Connection Panel
NTE Power unit
5A (mains powered)
Any on-site wiring and equipment beyond the NTE is your
responsibility, and maintained by the relevant contractor.
This may be BT, or an independent supplier.
The NTE interfaces, through an external connection panel,
with a 1 Mbit/s, HDB3 coded, framed or unframed signal
coming from your equipment (CPE), and frames it for HDSL
transmission. You can connect your CPE to the NTE either via
a 75Ω unbalanced line or via 120Ω balanced line. Both lines
can support unframed and framed facilities and an X.21
connector. X21 has a maximum cabling distance of
75 metres.
Figure 2 here shows the
various connectors
BT Use only
15 way D-conn for X.21
RJ45
BNC Connectors in/out
Figure 3 Local End NTE (CWSS – 1 x 1Mbit/s circuits)
If you have a problem
If you think there may be a problem with your MegaStream 1
circuit, or with your NTE, please consult figure 3 and the
table below.
If a fault turns out to be in your terminal equipment or on-site
wiring, rather than in your MegaStream 1 circuit, BT reserves
the right to charge for time spent on a visit to your premises.
It’s in your interest to carry out the following checks first; you
may be able to solve the problem.
The designations and functions of the LEDs in the LED panel
on the side of the NTE51A is shown alongside.
The following table gives an overview of symptoms, cause and action
LED/Alarm
Symptom
Cause
Action
1Mbit/s/X.21
(Red)
Glowing – steady indication
Local fault; Input to the NTE is
disconnected or invalid
Check that cables to unit are
connected and are not faulty;
ensure that the customer terminal
equipment is operating correctly
1Mbit/s/X.21
(Red)
Glowing – flashing indication
Remote fault; indicates a fault
elsewhere within the BT network
Report fault to Service
Management Centre
HDSL
(Red)
Glowing- steady or flashing
Fault on BT’s line
Report to Service Management
Centre
TEST
(Yellow)
Glowing – steady indication
BT is performing a test on the
circuit or a self test condition has
been applied
If a circuit report has not been
reported, ensure that no testing
has been arranged; if symptom
persists, report to Service
Management Centre
POWER
(Green)
Not glowing
Loss of power
Check local power connections
first.
Otherwise report to Service
Management Centre.
ALARM
(Red)
Permanent
Indicates a likely fault
Check 1Mbit/s & HDSL LED
conditions, then report to Service
Management Centre
How to Report a Fault
In the event of difficulties with service, the Hub or control
point should be contacted to ensure that the service is still
operational from the server. Only when the equipment
connected to the BT service has been tested should a fault be
reported to the BT Fault Reporting Point. It is recommended
that the Hub location reports and controls any faults.
The BT Fault Reporting Number is
Offices worldwide
The telecommunications services described in this publication are subject to availability and may be modified from time to time. Services and equipment are provided subject to British Telecommunications plc’s
respective standard conditions of contract. Nothing in this publication forms part of any contract.
© British Telecommunications plc 2004. Registered office: 81 Newgate Street, London EC1A 7AJ. Registered in England No. 1800000.
Printed on paper which meets international environmental standards.
PHME 46866/10/04