Page 1
Cross-section 2-pair twin-axial cable
Panduit® SFP+ connector
10Gig™ SFP+ Direct Attach Cop per Cable Assembly
Installation Guidelines PN533B
Introduction
As virtualization, consolidation, and convergence initiatives continue to expand in Data Centers, so do the
demands placed on the physical infrastructure. To meet the needs for higher bandwidth along with lower
power interconnects, Pand uit
This high speed data transport capability is ideal as server virtualization becomes more prevalent. 10Gig
interconnects are needed to facilitate effective server utilization to run multiple virtual machines as well as
server consolidation. By incorporating 10Gig™ SFP+ Copper Cable Ass emblies into the physical
infrastructure, organizations can achieve 10Gig performance without additional signal processing or
conversion. This provides an ideal low power, low latency 10 Gbps server interconnect option for top of
rack switching deployments.
Passive 10Gig™ SFP+ Copper Cable Assemblies generally have a reach lim itati o n of 7m (23 ft.), and
many network deployments will consist of a mixed copper/fiber solution with Panduit 10Gig™ OM3 fiber.
Panduit 10Gig™ SFP+ Direct Attach Copper Cable Assembl ies
™
Panduit 10Gig
SFP+ Copper Cable Assemblies are factory terminated and constructed of high-speed
twin-axial shielded cable with SFP+ modular connectors on each end. The cables are compliant to the
SFF-8431 specification.
The Small Form Factor committee approved and pub l is hed SFF -8431 in July of 2009, with Panduit
member and a signee. The document covers host ports, optical transceivers, and copper cables.
Appendix E specifies direct attach copper cable assemblies.
These passive cable assemblies offer a low power, low latency, low cost option for a 10Gig interconnect.
They may be plugged into SFF-8431 SFP+ compliant ports and are interchangeable with fiber optic
transceivers. (Note: some system vendors have designed copper-only or fiber-onl y SFP + ports, so be
sure to confirm host port capabilities with the active equipment vendor)
The Panduit
®
10Gig™ SFP+ Direct Attach Cable As semblies are constructed with high frequency 10 GHz
100 ohm parallel shielded pairs, with two wire pairs in the cable. Panduit
than 4m in length and uses 24 AWG for 4m and longer cables.
The connector consists of a paddle card with patent pending circuitry to ensure superior high frequency
signal integrity, is housed in a die cast backshell, and incorporates a latching mechanism that allows
insertion and de-insertion into the mechanical cage of a host port on the active equipment. The same
host port cage can accept optical transceivers or direct attach cable assemblies. The back of the paddle
card has pads which form the contacts to the 20 pin host connector inside the cage. The connector has
an EMI shroud that provides 360 degrees of contact with the host cage to ensure excellent EMI immunity.
®
offers 10Gig™ SFP+ Direct Attach Copper Cable Assemblies.
®
uses 30 AWG for cables less
®
as a
Panduit Corporation, 2011 Page 1 of 7
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10Gig™ SFP+ Copper Cable Assembly Installation Guidelines PN533B
Standard Cable Part Numbers
Part Number Length* Cable Gauge Nominal Cable O.D. Weight/pc
PSF1PXA0.5M** 0.5m (1.6 ft.) 30 AWG 4.1mm (0.161 in.) 0.10 lb.
PSF1PXA1M** 1.0m (1.6 ft.)
PSF1PXA1.5M** 1.5m (4.9 ft.)
PSF1PXA2M** 2.0m (6.6 ft.)
PSF1PXA2.5M** 2.5m (8.2 ft.)
PSF1PXA3M** 3.0m (9.8 ft.)
PSF1PXA3.5M** 3.5m (11.5 ft.) 30 AWG 4.1mm (0.161 in.)
PSF1PXD4M** 4.0m (13.1 ft.) 24 AWG 6.0mm (0.236 in.)
PSF1PXD4.5M** 4.5m (14.4 ft.) 24 AWG 6.0mm (0.236 in.)
PSF1PXD5M** 5.0m (16.4 ft.) 24 AWG 6.0mm (0.236 in.)
PSF1PXD5.5M** 5.5m (17.6 ft.) 24 AWG 6.0mm (0.236 in.)
PSF1PXD6M** 6.0m (19.7 ft.) 24 AWG 6.0mm (0.236 in.)
PSF1PXD6.5M** 6.5m (20.8 ft.) 24 AWG 6.0mm (0.236 in.)
PSF1PXD7M** 7.0m (23.0 ft.) 24 AWG 6.0mm (0.236 in.)
30 AWG 4.1mm (0.161 in.) 0.13 lb.
30 AWG 4.1mm (0.161 in.) 0.16 lb.
30 AWG 4.1mm (0.161 in.) 0.19 lb.
30 AWG 4.1mm (0.161 in.) 0.22 lb.
30 AWG 4.1mm (0.161 in.) 0.25 lb.
0.28 lb.
0.49 lb.
0.50 lb.
0.60 lb.
0.62 lb.
0.70 lb.
0.71 lb.
0.81 lb.
* Panduit® 10Gig™ SFP+ copper cables have a length tolerance of + .15 - 0m
** Add cable color code to end of part number, BU for Blue, WH for White, BL for Black.
Cable Length Deployment Note
®
Note that the Panduit
10Gig™ SFP+ Direct Attach Cable Assembly lengths are measured from cable
connector tip- to-tip. However, much of the connector is inserted into the host port. Therefore one may
wish to add approximately 47mm or 1.87 in. to each end or approximately 0.1m total to port-to-port length
and cord routing calculations.
Connector EEPROM
®
Panduit
has an integrated EEPROM with information populated in registers that is provided to the active
equipment when queried through an I
10Gig™ SFP+ Direct Attach Copper Cable Assemblies are intelligent cables. The connector
2
C bus Most active equipment port allow for interchangeable types
of me to be plugged into its ports. The registers in the EEPROM provide a method for the connector to
identify itself as an SFP+ passive copper module to allow the active equipment to operate in the proper
mode. Other information contained in the memory registers includes vendor name (Panduit), part
number, serial number, and cable length in meters.
Panduit Corporation, 2011 Page 2 of 7
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10Gig™ SFP+ Copper Cable Assembly Installation Guidelines PN533B
Contact
Logic(1)
Symbol
Power
Order
Description
Note
Case
Case
Note 2
Module case
2 1
VeeT
1st
Module transmitter ground
3
3
LVTTL-I
Tx_disable
3rd
Transmitter disable (N/A)
4
4
SDA
3rd
2-wire serial interface data line, same as MOD-DEF2
5
6 Mod_ABS
3rd
Module absent, connected to VeeT or VeeR in module
6 7 LVTTL-I
RSO
3rd
Rate select 0, optionally controls SFP+ receiver (N/A)
4
Rate select 1, optionally controls SFP+ transmitter
(N/A)
10 VeeR
1st
Module receiver ground
3
11 VeeR
1st
Module receiver ground
3
12
CML-O
RD-
3rd
Receiver inverted data output
13
CML-O
RD+
3rd
Receiver non-inverted data output
14 VeeR
1st
Module receiver ground
3
15 VccR
2nd
Module receiver 3.3V supply
16 VccT
2nd
Module transmitter 3.3V supply
17 VeeT
1st
Module transmitter ground
3
18
CML-I
TD+
3rd
Transmitter non-invert ed data output
19
CML-I
TD-
3rd
Transmitter inverted data output
20 VeeT
1st
Module Transmitter Ground
3
Notes:
module (cable connector)
SFP Connector Module Contact Assignments
(Top and Bottom are backwards)
SFP+ Cable Assembly Connector Pin Out
SFP+ Pin Assignment Definitions
Sequence
2 LVTTL-O Tx_fault 3rd Module transmitter fault (N/A) 4
LVTTL-I/O
5
8 LVTTL-O Rx_LOS 3rd Receiver loss of signal indication (N/A) 4
9 LVTTL-I RS1 3rd
LVTTL-I/O
SCL
3rd 2-wire serial interface clock, same as MOD-DEF1 5
4
1. Labeling as Input (I) and Output (O) are from perspective of the module (cable connector)
2. The case makes electrical contact to the host cage before any board edge contacts are made
3. The module signal grounds, VeeR and VeeT, should be isolated from the module case
4. Tx-fault, Tx_disable, rate select, and loss of signal functions are not implemented in passive copper cable
assemblies
5. SDA and SCL are the data and clock pins for the I2C interface to the EEPROM on board the module. The
registers are defined in SFF-8472.
6. Mod_ABS is an output pin to indicate if the module is present in the host port It is connected to ground in the
Panduit Corporation, 2011 Page 3 of 7
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10Gig™ SFP+ Copper Cable Assembly Installation Guidelines PN533B
Installing and Removing 10Gig™ SFP Copper Cable Assemblies
To attach a cable assembly, remove the purple protective EMI cap. Then simply insert the connector
end into the cage of the SFP+ host port in the active equipment. Make sure the cable is fully inserted and
engaged.
ATTENTION: Observe precautions for handling electrostatic sensitive electronic devices when installing
this product. Ensure tha t you are prop erly grounded with a wrist strap or equivalent while installing
10Gig™ SFP+ Copper Cables.
To disengage, gently pull the latch release and the cable assembly will easily disengage the port. The
Panduit
®
10Gig™ SFP+ Direct Attached Copper Cable Assemblies have been designed to fit into high-
density belly-to-belly faceplates.
Panduit Corporation, 2011 Page 4 of 7
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10Gig™ SFP+ Copper Cable Assembly Installation Guidelines PN533B
Cable Wire Gauge
O.D.
Min. Bend Radius (r)
30 AWG
4.1mm (0.16 in.)
20.5mm (0.80 in.)
24 AWG
5.6mm (0.22 in.)
28.0mm (1.10 in.)
r
Cable Management
The weight of large bundles of SFP+ twin-axial cables can exert a significant force along the horizontal
plane, and specifically on the host port of the active equipment. If the cable emerges from the rear of the
connector at too sharp an angle, excess mechanical stress may be transmitted both along the cable and
into the circuit board located inside the connector. Excessive side forces exerted by the cable can also
misalign the plug in the equipment-mounted receptacle. These forces may degrade performance or even
possibly damage the connector and lead to failure. It is important to observe and maintain proper cable
bend radius and equally important to provide adequate and secure strain relief on the cable.
In order to help maintain proper bend, it is recommended to pre-form the strain relief bend on the cable
before installing. The minimum recommended bend radius is 5X the cable outside diameter (O.D.) for a
single time bend and 10X the OD for repeated bends.
Minimum Bend Radius Guide
To help manage the weight of bundled cable and ensure they do not sag over time, a cable manager or
strain relief bar should be installed to support SFP+ Copper Cable Assemblies and provide strain relief
along the horizontal plane. Strain relief bars facilitate the correct alignment of cable and connector into
the port, and help installers observe manufacturer and bend radius requirements of cable close to the
connector. The strain relief bars also help keep cables routed clear from spaces directly behind server
and switch equipment, reducing thermal resistance through the equipment and promote effective cooling
and airflow. To ensure long-term reliability, it is recommended to use a rack with integral cable
management features such as the Panduit
®
Net-Access™ Cabinets.
Tak-Ty™ Hook and Loop Cable Ties should be used to bundle the cables together and tie them to the
strain relief bars and cable managers. This should be done carefully to ensure the cables are firmly in
place and will not move, but not so tight as to deform or stress the cable jacketing.
Cable Installation Tips and Best Practices
There are a few practical steps that can be taken during installation to optimize the effectiveness of the
layout.
For overhead cable routing, place the switches near the top of the racks
For under floor cable routing, place the switches near the bottom of the racks
Do not route SFP+ Cable Assemblies parallel to power cables, they should only cross at right
angles
Do not route cables in front of fans or air ventilation areas of the rack
Do not kink cables
Do not twist connectors
Use Tak-Ty™ Hook and Loop Cable Ties to secure cables, do not use plastic cable ties
Slack Management
Standard cables come in 1m (3.3 ft.) increments. Often installers will standardize on a small number of
standard lengths to simplify the bill of material. One cannot always anticipate possible infr astr uc ture
obstacles on site so it is good practice to estimate long when defining cable lengths. Therefore, it is
possible that there will be cable slack and this needs to be managed properly to ensure reliable long term
performance. The slack in the cable should be shaped and looped so as not to violate bend radius.
Slack or loops should be securely tied in place so they do not slip or sag over time.
Panduit Corporation, 2011 Page 5 of 7
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10Gig™ SFP+ Copper Cable Assembly Installation Guidelines PN533B
84 inches =
7 ft. = 2.1m
Example cabinet with 2 top of
Example of 3 cabinet Pod with 40
General Deployment Topology Guidelines
Within a single 84 in. 45 RU cabinet, conservatively the longest connection will be 7 ft. or 2.1m to reach
from the top U to the bottom and approximately 1.5 ft. or 0.45m to route to any port on either end. A 3m
cable should be adequate to connect any two ports within a cabinet.
rack switches (ToR) and 20 2U
servers with Dual SFP+ NICs
total of 40 SFP+ cables
Conservatively, longest cable
required to reach farthest port
is 2.1 + 2.x 0.45 ≈ 3m
2 RU servers distributed over 3
cabinets with 2 ToR switches in
center cabinet requires 80 SFP+
cables with longest cable of 4m
Example of 5 cabinet Pod with 80
2 RU servers distributed over 5
cabinets with 4 ToR switches in
center cabinet requires 160 SFP+
cables with longest cable of 5m
Panduit Corporation, 2011 Page 6 of 7
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10Gig™ SFP+ Copper Cable Assembly Installation Guidelines PN533B
Using Middle of Row switching topology, an 8 cabinet row
may be achieved with 7m cables. This has two switch
cabinets in the center and 3 server cabinets on each side.
If all switching were placed in a single center cabinet, a 9
cabinet row with 8 server cabinets may be covered. To
enable longer row, fiber and SFP+ optical transceivers are
required. A hybrid solution of Panduit
copper for the inner cabinets and Panduit
®
10Gig™ SFP+
®
10Gig™ OM3
fiber to the outer cabinets will be the cost effective solution.
For Instructions in Local Language s
and Technical Support:
www.panduit.com/resources/install_maintain.asp
www.panduit.com
Page 7 of 7
techsupport@panduit.com
E-mail:
Phone:
866-405-6654
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