Telcordia GR-1089, Issue 6 Calls for New Protection and Testing of
Ethernet
Ports
White
Paper:
Telcordia GR-1089, Issue 6 Calls for New Protection and
Testing of Ethernet Ports
For several years communication system designers
have been using Issue 5 of the Telcordia GR-1089
specification in the design of Ethernet ports, and surge
protection for those ports. To correct some ambiguities
and other shortcomings of that spec, Telcordia and
several companies supplying equipment to the
communications industry worked on revisions, which
have now been published as GR-1089, Issue 6. The new
spec defines additional port types, surge suppression
required for them, and testing to verify the effectiveness
of that suppression. In particular, Ethernet ports,
including PoE, and associated surge suppression testing
have been redefined and expanded in Issue 6. These
changes require that all Ethernet interfaces be subjected
to metallic and longitudinal lightning surge and power
fault testing, with the exception of Type 2 Ethernet ports.
This white paper explains what that means for
communications equipment suppliers, and how their
engineers must design and test Ethernet ports and
interfaces to meet the requirements of GR-1089, Issue 6.
GR-1089 Issue 6 Summary
Let’s begin with a brief overview of the standard. Issue 6
contains ten chapters:
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
Introduction
System-Level ESD and EFT
EMI
Lightning and Power Fault
Steady-State Power Induction
DC Potential Difference
Electrical and Optical Safety Criteria
Corrosion
Bonding and Grounding
Criteria for Telcom Load Equipment DC Power
Port
This generic requirements document covers EMC
(Electro Magnetic Compatibility) and electrical safety
needed for equipment to operate in a safe and reliable
manner. This document covers equipment used at
Central Offices (COs), outside plant (OSP) locations,
and customer premises (CPs) locations. Interestingly, it
does NOT cover on-hook leakage limits, off-hook input
impedance criteria, loop DC resistance, nor does it cover
loop capacitance except for the inclusion on first level
criteria that states equipment must continue to operate
after applied events.
The main reasons for this new version of the standard
are:
1) Simplify and condense the requirements
contained in Section 4 Lightning and Power
Faults
2) Address technical issues related to lightning
throughout the document
3) Address ground resistivity and ground potential
rise (GPRs), fast rise time surges, and GDT
interaction
4) Revise Section 5 Steady-State Power Induction
5) Add Appendix A Definition of DoubleExponential Impulse Waveform
6) Add Appendix B Application Guidelines
7) Add Appendix F Wireless
8) Radiated and magnetic EMI requirements were
revised to eliminate test frequencies below 30
MHz.
Waveshape Lightning Surge Definition
It has six appendices:
A) Definition of Double-Exponential Impulse
Waveform
B) Application Guidelines
C) References
D) Definitions
E) Acronyms
F) Wireless
©2011 Littelfuse, Inc
1
Telcordia GR-1089, Issue 6 Calls for New Protection and Testing of
Ethernet Ports
1.2x50 and 10x700 Voltage Waveshape Lightning
Surge Definition
Section 4 Lightning and Power Fault was edited
extensively. Intra-building applications are exposed to
transient events due to ground potential rises (GPRs).
This updated version now covers the case when outside
plant (OSP) wiring becomes short-circuited. Seven port
type definitions were added to this Issue 6 revision (3a,
3b, 4a, 5a, 5b, 8a, and 8b).
Port Types
Port
Type
Number
1
2
3
Description
Issue 5
Network inter-building
Network intra-building
Customer premises
(CP) inter-building
3a
3b
4
Cell site location added
Intra-cell site CP ports
Short reach OSP CP
ports
Customer premises
intra-building
4a
5
5a
5b
6
7
8
8a
8b
Issue 6
Customer side ONT
intra-building port
OSP Inter-building
Intra-cell site
Short reach OSP ports
Antenna ports
AC power ports
Local DC power ports
DC power to antenna
Intra-cell site DC power
1) Type 1 port is CO equipment (inter-building) that
connects to outside plant (OSP).
2) Type 2 port is CO equipment (intra-building) that
does NOT connect to outside plant.
3) Type 3 port is customer located equipment or
cellsite equipment that connects to OSP.
©2011 Littelfuse, Inc
4) Type 3a and 5a ports (intra-cell site location)are
located at cell sites or similar sites with large
antennas and are considered intra-building
types and IF they do have cables that run
outdoors it runs ONLY short distances.
5) Type 3b and 5b ports are short reach (< 500
feet) outside cables. Most commonly these are
Ethernet or Power over Ethernet (PoE) type
ports) therefore considered intra-building
exposure.
6) Type 4 ports are non-CO intra-building types; i.e.
do not connect to the outside plant but may be
located at cabinets, remote terminals, cell sites,
or CP.
7) Type 4a ports customer side ONT (Optical
Network Terminal) and NID (Network Interface
Device) ports such as POTS (Plain Old
Telephone Systems) and Ethernet.
8) Type 5 ports are OSP located equipment with
connections to outside plant.
9) Type 6 ports are antenna ports.
10) Type 7 AC power ports.
11) Type 8 DC power ports (but not including DC
span powering used in telcom) .
12) Type 8a DC power to antenna (i.e. high
exposure environment).
13) Type 8b port is an intra-cell site DC power.
Issue 6 assumes a high-voltage category primary
protector is always used. This allows a let-through
impulse maximum voltage of 1000V peak and a 60Hz
maximum let-through of 425V rms (600V peak). This
replaces the prior assumption of a 3-mil-gap carbon
block that would allow a 60Hz let-through of 600Vrms
(850V peak). This assumption results in different
maximum voltages for the first and second level power
fault testing.
All Ethernet interfaces shall be subjected to metallic and
longitudinal lightning-surge and power-fault testing with
the exceptions of Type 2 Ethernet ports. For 10/100
BaseT interfaces, some pairs may not be used for data
but will have a “Bob Smith” termination circuit. These
pairs are also to be tested and the termination
components cannot be damaged since their failure could
result in increased radiated emissions. PoE interfaces
shall also have the inter-powering pair of wires surge
tested.
The following Type 2 Ethernet ports are subjected to
longitudinal type surges only (no metallic surge testing)
IF it meets the following criteria:
2
Telcordia GR-1089, Issue 6 Calls for New Protection and Testing of
Ethernet Ports
a)
LAN cabling is not connected to external
environment
b) All LAN equipment powered from a
single power feed
c) Ground referenced SPDs are not
installed
d) None of the ports are TNV
(telecommunication network voltage)
circuit type (non-PoE types only)
Two-Wire Telcom Interface
Connection
A1 (metallic)
A2 (metallic)
A3 (metallic)
A4 (metallic)
A5 (longitudinal)
A6 (longitudinal)
B (longitudinal)
S1
Closed
Open
NA
NA
Closed
NA
Closed
Connection
A1 (metallic)
A2 (metallic)
A3 (metallic)
A4 (metallic)
A5 (longitudinal)
A6 (longitudinal)
B (longitudinal)
S1A
Open
Open
Open
Open
Open
Open
Open
S2
Open
Closed
NA
NA
Open
NA
Open
S3
Open
Closed
NA
NA
Closed
NA
Closed
S4
Closed
Open
NA
NA
Open
NA
Open
st
S2A
Open
Open
Open
Open
Open
Open
Open
S3A
Open
Open
Open
Open
Open
Open
Open
S4A
Open
Open
Open
Open
Open
Open
Open
1 Level Inter-Building Surges for Telcom Ports Issue 5
Surge #
1
2
3
4
5
Four-Wire Telcom Interface
Connection
A1 (metallic)
A2 (metallic)
A3 (metallic)
A4 (metallic)
A5 (longitudinal)
A6 (longitudinal)
B (longitudinal)
S1
Closed
Open
Open
Open
Closed
Open
Closed
S2
Open
Closed
Closed
Closed
Open
Closed
Closed
S3
Open
Closed
Open
Open
Closed
Open
Closed
S4
Closed
Open
Closed
Closed
Open
Closed
Closed
Connection
A1 (metallic)
A2 (metallic)
A3 (metallic)
A4 (metallic)
A5 (longitudinal)
A6 (longitudinal)
B (longitudinal)
S1A
Open
Open
Closed
Open
Open
Closed
Closed
S2A
Closed
Closed
Open
Closed
Closed
Open
Closed
S3A
Open
Open
Open
Closed
Open
Closed
Closed
S4A
Closed
Closed
Closed
Open
Closed
Open
Closed
Min
voltage
peak
value
(v)
Min
current
peak
value
(A)
Rise/decay
waveshape
(µs)
Reps
Test
Connections
± 600
100
10/1000
A
±25
±1000
100
10/360
A
±1000
100
10/1000
A
(Surge #3 may be conducted instead of surge #1 and 2)
±2500
500
2/10
±10
B
±1000
25
10/360
±5
B
*Not required if > 95A drawn during surge #3 (1000V, 100A
test condition)
** Not required for applications with primary protectors mounted
within 1 meter and longest dimension of the cabinet is ≤ 1 meter. A
special termination circuit is used for the 2/10 inductive kick tests to
prevent excessive metallic surges due to known characteristics of
2/10 surge generators (a voltage dependent resistor is placed
across the simultaneous “high” outputs).
st
1 Level Surges for Remote Outside Plant Locations Port
Types 3, 5 (3b/5b Surge #1)
Surge
#
Min voltage
peak value
(v)
Min
current
peak
value (A)
Rise/decay
waveshape
(µs)
1
2
3
±1000
±1000*
±400 to
±4000 (High
lightning
exposure)
200
100
50
@400V
to 500
@4000V
2/10
10/1000
10/1000
Reps
Test
Connections
A
A5, A6
A
±5
* Test is performed with 5 and 25 ohm resistance added
between EUT ground and surge generator return (GPR testing)
to simulate high soil resistivity conditions
©2011 Littelfuse, Inc
3
Telcordia GR-1089, Issue 6 Calls for New Protection and Testing of
Ethernet Ports
st
1 Level Surges for Remote Outside Plant Locations Port
Types 3, 5 (3b/5b Surge #1)
Surge
#
Min voltage
peak value
(v)
Min
current
peak
value (A)
Rise/decay
waveshape
(µs)
1
2
3
±1000
±1000*
±400 to
±4000 (High
lightning
exposure)
200
100
50
@400V
to 500
@4000V
2/10
10/1000
10/1000
Reps
Test
Connections
A
A5, A6
A
±5
* Test is performed with 5 and 25 ohm resistance added
between EUT ground and surge generator return (GPR testing)
to simulate high soil resistivity conditions.
st
1 Level Intra-building Surges for Port Types 2, 3a/5a, 4,
4a up to 2 Pairs
Surge
#
1 /or
2 /or
3 /or
4 /or
Min voltage
peak value
(v)
Min current
peak value
(A)
Rise/decay
waveshape
(µs)
±800
(external 6
ohm per
wire if
1.2/50
waveshape
used)
±1500
(external 10
ohm per
wire if
1.2/50
waveshape
used)
@ ±Vs
(external 6
ohm per
wire if
1.2/50
waveshape
used)
100
400 (before
external
resistance
is added)
2/10
1.2/50-8/20
100
750 (before
external
resistance is
added)
2/10
1.2/50-8/20
100 @ 800V
100@
1500V
Reps
Test
Connections
A1, A2,
A3, A4
±5
2/10
1.2/50-8/20
2/10
B
A1, A2,
A3, A4
The Type 2 Ethernet ports are exempted from metallic
(differential) testing IF
1) the port does not contain a grounded secondary
protector
2) any unused pins are not grounded (Bob Smith
termination is not considered as a grounded
connection in this context)
Type 4 and 4a are exempted from the metallic testing until
August 1, 2012.
st
1 Level Surges for Customer Side ONT Interfaces (Port
Type 4a)
Surge
#
Min voltage
peak value (v)
Min
current
peak
value (A)
1
±800 (external
6 ohm per
wire)
±1500(external
40 ohm per
wire)
<36/wire
for > 4 pair
@ ±Vs
<42/wire
for > 4 pair
Rise/decay
waveshape
(µs)
Reps
Test
Connections
Metallic*
1.2/5-8/20
±5
100 @
800V
35.7@
1500V
*each wire with all other wires grounded (metallic, one at a
time)
©2011 Littelfuse, Inc
Reps
Test
Connections
st
Surge
#
4
Rise/decay
waveshape
(µs)
1 Level Surges for Antenna Port (Port Type 6)
Surge
#
Min
voltage
peak
value
(v)
Min
current
peak
value
(A)
Rise/decay
waveshape
(µs)
Reps
Test
Connections
1
±600
300
1.2/5-8/20
±5
Center
conductor to
shield
st
3
Min
current
peak
value
(A)
B
1 Level Intra-building surges for Port Types 2, 3a/5a, 4, 4a
with more than 4 pairs (test 1 & 3 for unshielded PoE ports)
2
Min
voltage
peak
value
(v)
B
Metallic*
B
st
1 Level Surges for AC Power Port (Port Type 7)
Surge
#
Min
voltage
peak
value (v)
Min
current
peak
value
(A)
1
±2000 (if
external
protector
present)
1000
Rise/decay
waveshape
(µs)
1.2/5-8/20
Reps
±5
Test
Connections
Phase to
neutral,
phase to
ground, &
neutral to
ground
4
Telcordia GR-1089, Issue 6 Calls for New Protection and Testing of
Ethernet Ports
2
nd
Level Surges for Port Types 1, 3 and 5
Surge
#
Min
voltage
peak
value
(v)
Min
current
peak
value
(A)
Rise/decay
waveshape
(µs)
Reps
Test
Connections
1
±5000
500
2/10
±5
A
Littelfuse, Inc.
8755 West Higgins Road, Suite 500
Chicago, IL 60631 USA
Phone: (773) 628-1000
www.littelfuse.com
st
1 Level Power Fault Tests (Port Types 1, 3, and 5)
Test
#
1
2
Min
voltage
RMS
value
(V)
50
Vs
3
4
100
Vs
5
6
7
8
9
10
200
425
Vs
1000
425
425
Min RMS
current
per
conductor
(A)
0.33
0.33 @ 50
V
0.17
0.17 @ 100
V
0.47
1
1 @ 425 V
1
0.50
0.71
Reps
Duration
1
15
minutes
Test
Connections
A
60
1s
1
5
4s
2s
B
A
Vs tests are conducted at the primary protector maximum
voltage breakdown with the primary protector removed from
the circuit.
.
Issue 6 of GR-1089 does NOT allow the specifying of external
current limiters; therefore EUTs are required to comply with the
nd
following 2 Level power fault tests without any current limiters
in the test circuit.
nd
2 Level Power Fault Tests (Port Types 1, 3 and 5) (Test
also for 3a, 3b, 4, 4a, 5a, and 5b)
Test
#
1
2
3
4
5
Min
voltage
RMS
value (V)
120
277
425
Vs
425
6
425
7
8
Vs
Vs
Min RMS
current per
conductor (A)
Duration
25
15 minutes
40
Vs /10.6
7, 10, 12.5,
20, 25, & 30
2.2*, 2.6*, 3.0,
3.75, & 5
Vs /60.7
Vs /193.2* &
2.2*
Test
Connections
1.5 s
5s
A
15 minutes
5s
15 minutes
* wiring simulator is NOT installed for this test condition
©2011 Littelfuse, Inc
5