Form Factors

Form factor refers to the physical dimensions and shape of a transceiver. Form factor includes aspects like the size, shape, connector type, and other physical characteristics. It determines how the transceiver fits into networking equipment like switches, routers, or servers.

Juniper supports the following form factors for 800GbE transceivers:

OSFP800
QSFP-DD800

Octal Small Form Factor Pluggable (OSFP800)

OSFP is designed for high-speed applications, including Juniper's 800GbE transceivers. It focuses on efficiently managing heat dissipation. It is compatible with some of the other form factors such as OSFP400. Based on the design, an OSFP transceiver module can be of two types:

OSFP transceiver module with integrated heat sink (OSFP or OSFP-IHS)—The standard configuration for an OSFP transceiver.
OSFP transceiver module with riding heat sink (OSFP-RHS)—The OSFP-RHS is a 9.5 mm tall pluggable module that is used in place of the standard integrated heat sink.

OSFP and OSFP-RHS are two different form factors. You cannot have a common host for these optical transceivers. The following are the features of OSFP-RHS:

3.2 T capacity using 400GbE lanes
Optimization for cold-plate, liquid-cooled system
Input voltage of 12 V (optimized for the anticipated power consumption)

Table 1: Feature Comparison of OSFP and OSFP-RHS
Transceiver Feature	OSFP or OSFP-IHS	OSFP-RHS (in Comparison to OSFP)
Transceiver module (height)	13 mm height for OSFP within the cage	9.5 mm height without heat sink
Connector	Identical with surface mount connector	Identical with surface mount connector
Host PCB board layout	Identical with surface mount type	Identical with surface mount type
Cage	Port height/positive stop/bezel cutout is different from OSFP-RHS	OSFP-RHS can be installed in an OSFP cage
Insertion, extraction, and retention	Identical	Identical
Durability	Identical	Identical
Thermal requirement	Standard: 0 through 70° C High power modules: 75° C to 80° C	Standard: 0 through 70° C High power modules: 75° C to 80° C
Power requirement	Gray optics: 16 W to 18 W ZR/ZR+ Optics: Up to 30 W	Gray optics: 16 W to 18 W ZR/ZR+ Optics: Up to 30 W
Electrical and management interface	Identical	Identical

Note:

If the feature is not explicitly specified for OSFP-RHS, the same specifications of OSFP are applicable.

Quad Small Form Factor Pluggable Double Density (QSFP-DD800)

QSFP-DD is smaller in size than the OSFP form factor. Hence, it can accommodate more ports per unit area. That is, a QSFP-DD form factor is ideal for networks that require high-density port layouts. QSFP-DD is compatible with QSFP56, QSFP28, and QSFP+ modules.

The following are the performance requirements of a QSFP-DD transceiver module:

Table 2: Performance Requirements of a QSFP-DD Transceiver Module
Performance Parameters	Description	Requirements
Mechanical or physical tests
Plating type	Plating type on connector contacts	Precious
Surface treatment	Surface treatment on connector contacts	Manufacturer to specify
Wipe length	Designed distance a contact traverses over a mating contact surface during mating and resting at a final position. If less than 0.127 mm, test group 6 is required	Manufacturer to specify
Rated durability cycles	The number of durability cycles a component encounters over the course of its life	Connector cage: 100 cycles Module: 50 cycles
Mating force¹	Amount of force needed to mate a module with a connector when latches are deactivated	QSFP module: 60 N QSFP-DD module: 90 N
Unmating force¹	Amount of force needed to separate a module from a connector when latches are deactivated	QSFP module: 30 N QSFP-DD module: 50 N
Latch retention¹	Amount of force the latching mechanism can withstand without unmating	QSFP module: 90 N QSFP-DD module: 90 N
Cage latch strength¹	The amount of force that the cage latches can hold without being damaged	125 N
Cage retention to host board¹	Amount of force a cage can withstand without separating from the host board	114 N
Environmental requirements
Field life	The expected service life for a component	10 years
Field temperature²	The expected service temperature for a component	65°C
Electrical requirements
Current	Maximum current to which a contact is exposed in use	0.5 A per signal contact MAX 1.5 A per power contact MAX 2.0 A (Single port QSFP-DD 1600) per contact MAX
Operating rating voltage	Maximum voltage to which a contact is exposed in use	30 V DC per contact MAX

¹^{—These performance criteria are not validated by EIA-364-1000
testing.}

²^{—Field temperature is the ambient air temperature around the
component.}

Comparison between OSFP and QSFP-DD Form Factors

Both OSFP800 and QSFP-DD800 are designed to support a data transmission speed of 800 Gbps. However, QSFP-DD800 and OSFP800 are different form factors and aren't physically compatible. That is, you cannot plug a QSFP-DD800 transceiver module into an OSFP800 slot, nor can you plug an OSFP800 into a QSFP-DD800 slot.

Table 3: Comparison of OSFP and QSFP-DD Form Factors
Feature	OSFP-IHS	OSFP-RHS	QSFP-DD	Notes
Size	Large	Large	Small
Heat sink	Supports an integrated heat sink limited by size constraints	Designed for higher heat dissipation. Supports both air and liquid cooled solutions with a riding heat sink.	Standard heat sink limited by size constraints. Supports a riding heat sink
Connector style	Large connector with 60 connector pins	Large connector with 60 connector pins	Small connector with 38 connector pins	The connectors are designed for high-density connections.
Power consumption	Gray optics: 16 W to 18 W	Gray optics: 16 W to 18 W	Gray optics: 16 to 18 W	These form factors aim for efficient power consumption
Power consumption	ZR/ZR+ optics: Up to 30 W		ZR/ZR+ optics: Up to 30 W
Thermal requirements	Standard: 0 through 70° C High power modules: 75° C to 80° C	Standard: 0 through 70° C High power modules: 75° C to 80° C	Standard: 0 through 70° C High power modules: 75° C to 80° C	The transceiver modules with OSFP and QSFP-DD form factors are designed to operate within the case temperature ranges provided.
Backward compatibility	Unique design, no backward compatibility with QDD optics.	Unique design, no backward compatibility with OSFP(IHS) and QDD optics.	Compatible with some of the other QSFP transceiver module ports such as QSFP56, QSFP28, and QSFP+.	Backward compatibility with the existing hardware ensures smooth transition, upgrade, operational flexibility, and cost savings.

The following are some of the key features to compare the OSFP and QSFP-DD form factors:

Color Codes
Insertion, Extraction, and Retention Forces
Thermal Requirements
Electrical Interfaces
LED Indicators
Power Requirements

Color Codes

The OSFP and QSFP-DD transceiver modules adhere to a color code by application of color to its pull-tab or other appropriate method.

Table 4: OSFP Color Codes
Product Type	Color	Pantone Code
OSFP copper cables	Black	Not applicable
OSFP AOC cables	Gray	422U
OSFP 850 nm solutions	Beige	475U
OSFP 1310 nm solutions for up to 500 m	Yellow	107U
OSFP 1310 nm solutions for up to 2 km	Green	354C
OSFP 1310 nm solutions for up to 10 km	Blue	300U
OSFP 1310 nm solutions for up to 40 km	Red	1797U
OSFP 1550 nm solutions for up to 80 km	White	Not applicable

Table 5: QSFP-DD Color Codes
Product Type	Color	Pantone Code
QSFP-DD copper cables	Black	Not applicable
QSFP-DD AOC Cables	Gray	422U
QSFP-DD 850 nm solutions	Beige	475U
QSFP-DD 1310 nm solutions for up to 500 m	Yellow	107U
QSFP-DD 1310 nm solutions for up to 2 km	Green	354C
QSFP-DD 1310 nm solutions for up to 10 km	Blue	300U
QSFP-DD 1310 nm solutions for up to 30 km	Red	1797U
QSFP-DD 1310 nm solutions for up to 40 km	Tangerine	1575U
QSFP-DD 1550 nm solutions for up to 80 km	White	Not applicable

Insertion, Extraction, and Retention Forces

The following are details about the insertion, extraction, and retention forces acting on an OSFP transceiver module:

Table 6: Insertion, Extraction, and Retention Forces for an OSFP Transceiver Module
Action	Minimum (N)	Maximum (N)	Notes
OSFP transceiver module insertion	Not applicable	40 (55)	Transceiver module to be inserted into connector and cage with latch mechanism engaged (55 N if the cage has riding heat sink)
OSFP transceiver module extraction	Not applicable	30 (45)	Transceiver module to be removed from connector and cage with latching mechanism disengaged (45 N if the cage has riding heat sink)
OSFP transceiver module retention	125	Not applicable	If the module has a pull tab, the pull tab should be able to withstand up to 90 N of the pulling under maximum operating temperature of the module.

Thermal Requirements

The OSFP transceiver module is required to meet the following thermal requirements while sustaining maximum power:

Table 7: OSFP Transceiver Module Thermal Requirements
Parameter	Value
Life expectancy	10 years
Maximum temperature rise (when all signal and power contacts are simultaneously energized)	Vendor specific

The QSFP-DD transceiver module is required to meet the following thermal requirements while sustaining maximum power:

Table 8: QSFP-DD Transceiver Module Thermal Requirements
Parameter	Value
Maximum temperature rise (when all signal and power contacts are simultaneously energized)	Vendor specific

Electrical Interfaces

The electrical interface of an OSFP transceiver module consists of a 60 contacts edge connector:

16 contacts for 8 differential pairs of high-speed transmission signals
16 contacts for 8 differential pairs of high-speed receive signals
4 contacts for low-speed control signals
4 contacts for power
20 contacts for ground

LED Indicators

An OSFP transceiver module has the following LEDs as status indicators:

Table 9: LED Signaling for an OSFP Transceiver Module
LED Status	Indication
On for 0.22 seconds (Channel 1)	Green—Indicates channel 1 is operational. Yellow—Indicates channel 1 is non-operational or disabled.
Off for 0.22 seconds (Channel 1)	Pause until LED indicates status of next channel.
On for 0.22 seconds (Channel 2)	Green—Indicates channel 2 is operational. Yellow—Indicates channel 2 is non-operational or disabled.
Off for 0.22 seconds (Channel 2)	Pause until LED indicates status of next channel.
...	The ellipsis pattern repeats to the final (nth) port.
Off for 1.76 seconds	Long pause for clear separation before pattern repeats from the beginning.

Power Requirements

Transceiver modules have varying power consumption levels and thermal output. It depends on the overall platforms design, airflow, size, height, and quality of the heat sinks on top of the ports.

OSFP and OSFP-RHS—The 800GbE gray optics clients that use the OSFP and OSFP-RHS form factor consume 16 W to 18 W approximately. The power consumption for the ZR/ZR+ optics clients is up to 30 W.
QSFP-DD—The 800GbE gray optics clients that use the QSFP-DD form factor consume 16 W to 18 W approximately.

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