NIU2A-TT2 Manual (PRELIM DRAFT)

Note

THIS IS A PRELIMINARY DRAFT OF THE NIU2A-TT2 MANUAL. INFORMATION (EXCEPT FOR DATA SHEET AND PART NUMBER DESIGNATION) IS CONSIDERED PRELIMINARY UNTIL OFFICIALLY PUBLISHED, AND IS SUBJECT TO CHANGE AT ANY TIME.

INTRODUCTION

This manual provides information about the North Atlantic Industries, Inc. (NAI) NIU2A System pre-configured and fitted with the TT2 Time-Triggered Ethernet (TTE) Switch Module. The NIU2A is a “Nano Interface Unit”; a small, rugged, low-power, self-contained, multifunction I/O system powered by an integrated 28 VDC nominal input MIL-STD-704F (designed to meet) power supply. When preconfigured with the TT2 TTE Ethernet Switch Module, which is based on TTTech’s certifiable TTEthernet® SMC2 Ethernet Switch Module Core, the NIU2A-TT2 operates as a standalone, multi-port, deterministic Ethernet communications switch that meets certification standards.

For a brief description of the system and complete list of features, click here for the NIU2A-TT2 data sheet.

CONVENTIONS USED IN THIS MANUAL

Note

An operating procedure, practice, or condition, etc., that is essential to emphasize.

All numbers are expressed in decimal format unless otherwise noted.

Website

http://www.naii.com/

GENERAL SAFETY NOTICES

The following general safety notices supplement the specific warnings and cautions appearing elsewhere in the manual. They are recommended precautions that must be understood and applied during operation and maintenance of the instrument covered herein.

Death or serious injury may result if personnel fail to observe safety precautions. Dependent on configuration, some modules (e.g. Synchro / Resolver or AC signal sources) can generate output signals with high voltages. Be careful not to contact high-voltage connections when installing, operating, or maintaining this instrument.

The NIU2A-TT2 is delivered as a standalone system with no accessible or serviceable parts.

Repair

DO NOT ATTEMPT REPAIR. Under no circumstances should repair of this instrument be attempted. All repairs to this chassis must be accomplished at the factory.

High Voltage

HIGH VOLTAGE may be used in the operation of this equipment.

Input Power Always On

Note

The design of the model NIU2A-TT2 is such that DC input power is continuously supplied to internal circuits when connected to a main power source. To disconnect the NIU2A-TT2 from external power, the external power source should first be de-energized. The power input cable can then be disconnected.

SYSTEM SPECIFICATIONS AND DETAILS

Introduction

The Nano Interface Unit configured with the TT2 TTE Ethernet Switch (NIU2A-TT2) is an integrated, compact, “nano-sized” subsystem pre-configured and fitted with a multi-port, deterministic Time-Triggered Ethernet (TTE) switch module based on TTTech’s certifiable TTEthernet® SMC2 Ethernet Switch Module Core.

The TT2 supports concurrent operation of three traffic classes: SAE AS6802 (Time-Triggered Ethernet), ARINC 664 Part 7 (Avionics Full-Duplex Switched Ethernet or AFDX®), and/or IEEE 802.3 best-effort protocol. By supporting all three traffic classes, the NIU2A-TT2 configuration is an ideal solution for users of IEEE 802.3 Ethernet who plan to upgrade to Deterministic Ethernet (ARINC 664 Part 7 AFDX® or Time-Triggered Ethernet SAE AS6802) protocols in the future without requiring hardware changes. The NIU2A-TT2 is particularly suitable for rugged Mil-Aero applications and offers readily available solutions that expedite the deployment of SWaP (Size, Weight, and Power) optimized systems in air, land, and sea applications.

The NIU2A-TT2 seamlessly communicates with the TE2, a single-port, tri-redundant, deterministic Ethernet communications End System module built on TTTech’s certifiable TTEthernet® IP core. This enables access to NAI’s COSA® family of products, which comprises a comprehensive range of modular, agile, and rugged Commercial Off-The-Shelf (COTS) solutions, including embedded smart modules, I/O boards, Single Board Computers, Power Supplies, and Ruggedized Systems.

This approach provides unprecedented flexibility for supporting existing or new applications where there are specific interfacing requirements.

Significant application benefits include:

• Standalone, multi-port, deterministic Ethernet communications switch supporting three concurrent traffic classes (SAE AS6802, ARINC 664 Part 7, IEEE 802.3)
• Migration path from best-effort IEEE 802.3 Ethernet to Deterministic Ethernet without hardware changes
• Certifiable Artifacts Package to DAL A: DO-254, DO-178C (Pending - contact factory)
• Minimal integration risk based on current field-proven, deployed technologies
• Only ~ 7.9” x 4.8” x 3.1” (incl. connectors) @ ~5 lbs. (2.27 kg), conduction cooled
• Ethernet Switching Capability:
  • 18x 10/100BASE-T ports
  • 6x 10/100/1000BASE-T ports
  • 1x 10/100/1000BASE-T Mirror port
• Fiber Optic capability, 100BASE-SX / 1000BASE-SX (optional; Pending - contact factory)

Objectives

This manual provides the user with basic hardware implementation and information regarding the operation and interface of the NIU2A-TT2. Each NIU2A-TT2 is fitted with the TT2 TTE Switch function module and an integrated motherboard, power supply unit (PSU) and interface connectors.

Scope

This manual covers the basic details and operation of the NIU2A-TT2 as a standalone, deterministic (TTE) Ethernet Switch subsystem with pertinent/specific details relating to the operation/communications from/to the NIU2A with the TT2 TTE Switch function module fitted within the NIU2A. Detailed information regarding the TTEthernet® SMC2 Switch Module Core, its configuration/loading toolchain, and network design/scheduling is provided by TTTech; contact TTTech for more information.

SPECIFICATIONS

The NIU2A-TT2 is designed to meet the following general specifications.

General

NIU2A-TT2 General SWaP Specifications

Input Voltage:	18 to 36 VDC (28 VDC nominal)
Power (Base unit):	~27 W @ 28 V VDC nominal. I/O Signal GND reference is isolated from main power source return and chassis.
Power/Heat Dissipation:	27 watts (maximum) when properly mounted to a cold-plate, which must be maintained at a temperature not to exceed 71°C.
Temperature, Operating:	-40°C to +71°C (Conduction cooled: as measured at primary thermal transfer interface.) 0°C to +55°C configuration also available (see Part Number Designation). Conduction-cooled; Convection/Air-cooled options (contact factory).
Temperature, Storage:	-55°C to 105°C
Size (approx):	Depth: 3.1” (78.7 mm) Height: 4.8” (121.9 mm) Width: 7.9” (200.7 mm)
Weight:	The approximate weight of a typical configured NIU2A-TT2 is ~5.0 lbs. (2.27 kg).

Environmental

Environmental MIL-STD-810 (*1)
No.	Description	Procedure	Cycles	Table	Figure	Comments
514	Random Vibe					Method 514.6, 0.1g /Hz from 100 to 1K Hz., -3dB octave 5-100 Hz and -6dB 1K-2K Hz,(operational)
514	Sinusoidal Vibe					TBD
501	Temp (High)		3			3 periods (@ 4 hrs. ea.) within 24 hrs. cycle at 71 C baseplate
502	Temp (Low)		1			3 periods (@ 4 hrs. ea.) within 24 hrs. cycle at -40 C baseplate
503	Temp (Shock)		3			3 x 1 hr. each hot & cold cycle
507	Humidity	II	10	507.5-7	507.5-IX	Cyclic high humidity (Cycle B2)
500	Altitude (50K)	II	1	n/a	n/a	10m/s to 50,000ft for 1 hr.
513	Acceleration	II	1	513.6-II	n/a	Carrier-based Aircraft (18g's max)
516	Shock - Operating	I	3	516.6-I	n/a	40g's, 1 min each x 6 axis (total of 18 shock pulses)
516	Shock - Crash	V	3	516.6-I	n/a	75g's, 1 min each x 6 axis (total of 18 shock pulses)
Ingress Protection IEC 60529 (*1)
No.	Description	Procedure	Cycles	Table	Figure	Comments
IP54	Dust Protection
IP54	Water Splashing
IP65	Dust Tight
IP65	Water Jets

EMI/EMC

EMC / MIL-STD-461 (*1, *2)
MIL-STD-461(G)	Method/Curve/Procedure	Comments
CE102	Conducted emissions, power leads, 30 Hz to 10 kHz.
CS101	Conducted emissions, power leads, 10 kHz to 10 MHz
CS106	Conducted susceptibility, power leads, 30 Hz to 150 kHz.
CS114	Conducted susceptibility, transients, power leads
CS115	Conducted susceptibility, bulk cable injection, 10 kHz to 200 MHz
CS116	Conducted susceptibility, bulk cable injection, impulse excitation
RE101	Conducted susceptibility, damped sinusoidal transients, cables and power leads, 10 kHz to 100 MHz
RE102	Radiated emissions, magnetic field, 30 Hz to 100 kHz.
RS101	Radiated emissions, electric field, 10 kHz to 18 GHz.
RS103	Radiated, susceptibility, magnetic field, 30 Hz - 100 kHz

Notes:
*1 - Designed to meet / Generic Test Reports (contact factory for availability).
*2 - Utilizing proper shielded cables and system practices.

Note

Specifications are subject to change without notice.

MTBF

The Mean Time between Failures is configuration, environment, and temperature dependent. Please contact factory regarding calculations based on the specific configuration and program requirements.

UNPACKING AND INSPECTION

Figure 1. NIU2A-TT2

Unpacking

The NIU2A-TT2 packing materials were designed specifically for transport protection of the NIU2A-TT2. When receiving the shipment container, inspect packaging for any evidence of physical damage. If damage is evident, it is recommended that the carrier agent is present when opening the shipping container. It is further recommended that all packing material is retained in the event the NIU2A-TT2 needs to be shipped elsewhere.

System/Chassis Identification

An identification label, indicating part number, unique serial number and Ethernet PHY MACs / default IP address(es) is affixed to the system chassis.

IMAGE PENDING

Figure 2. Unit Identification

Inspection

Inspect the chassis and connectors to ensure that they were not damaged during transit.

MECHANICAL INTERFACE

Mechanical Description

The NIU2A-TT2 is a rugged, aluminum, conduction-cooled system. It must be mounted to a cold plate. The system thermal management design considerations should ensure that the chassis thermal interface (NIU2A bottom surface) does not exceed 71°C. Mounting holes are provided on the chassis bottom housing flanges (as depicted). See the outline drawing below.

Mounting Requirements

Refer to NIU2A-TT2 Outline and Installation Drawing (OID) or NIU2A-TT2 with Fiber Outline and Installation Drawing (OID) for details on mounting and installing the NIU2A-TT2. It is available for download from NAI’s website. The NIU2A-TT2 is conduction cooled and must be mounted in accordance with the drawing. The OID provides recommended hardware, torque, cold-plate flatness and surface finish specifications, and thermal conductivity requirements.

Figure 3. NIU2A-TT2 Outline Dimensions/Cold Plate Mounting Pattern (Reference Only)

Notes:

1. For reference only (refer to the product web page for the latest revision NIU2A-TT2 Outline and Installation Drawing (OID).
2. Unless otherwise specified, dimensions are in inches (mm); tolerances are:

• 2 PL DEC ±0.01; 3 PL DEC ±0.005
• FRACT ±1/64 (0.4); ANGLES ±1/2 (12.7)

Chassis (Earth) GND

Chassis ground point threaded insert location is on the connector side of the NIU2A-TT2 as shown.

Figure 4. NIU2A-TT2 Outline Dimensions/Chassis GND location

Note

Chassis GND braid or equivalent to be secured by #6-32 screw/studs (with a depth of 0.3 inches) as end application requires. The NIU2A-TT2 chassis is provided with #6-32 threaded insert only. The recommended torque for the NIU2A-TT2 Chassis GND screw is 11 in-lbs. (125 N·cm)

CONNECTOR DESIGNATIONS, LOCATIONS & DESCRIPTIONS

The Power, Ethernet and Maintenance connectors are located on the NIU2A-TT2 front panel housing.

Figure 5. NIU2A-TT2 (Front Panel Connector Placement)

NIU2A-TT2 Connector Designation and Description

Connector Designation	Description
J1	Primary Power Connector, 28 VDC (nominal)
J2	66-Pin Ethernet Connector: 100BASE-T Switch Ports 7-12, 21-24; 1GBASE-T Switch Ports 5, 6; 1GBASE-T Mirror Port 25
J3	37-Pin Maintenance Connector: TTE Configuration Select, RS-232, I2C, Discretes (Maintenance/Ground/Shop Mode, Reset, Write Protect, Power Down, Watchdog Disable)
J4	66-Pin Ethernet Connector: 100BASE-T Switch Ports 13-20; 1GBASE-T Switch Ports 1-4

Connector Details and Pinout

Generic pinout. See module I/O section or contact factory regarding any special module I/O configuration.

J1, Primary Power Connector

Primary input power is supported on the NIU2A-TT2 via the J1 connector. Power input for the NIU2A-TT2: 28 VDC (nominal, standard, default).

Figure 6. J1 Primary Power Connector Detail

Parts Identification

J1 Primary Power Connector Definition

	Chassis (Box-level)			Mating Cable Connector
Designation	MIL-DTL Equivalent Reference	Shell/Insert	Pin-count	MIL-DTL Equivalent Reference	NAI P/N (for reference)
J1	D38999/20WA98PA (10,000 pF, incl. ‘c-filter')	9 / 98	3	D38999/26WA98SA	05-0297-COM

Pinout

J1 Primary Power Connector Pinout

J1 Connector Pin	Signal
A	Chassis GND
B	28VDC-RTN
C	28VDC

J2, Ethernet Switch Ports (7-12, 21-24, 5, 6 & Mirror 25)

The NIU2A-TT2 J2 66-pin Ethernet connector supports ten 100BASE-T TTE Switch ports (Ports 7 through 12 and Ports 21 through 24), two 1GBASE-T TTE Switch ports (Ports 5 and 6), and the 1GBASE-T Mirror/Monitor port (Port 25).

Figure 7. J2 Ethernet Switch Ports (7-12, 21-24, 5, 6 & Mirror 25)

Parts Identification

J2 Ethernet Connector Definition

	Chassis (Box-level)			Mating Cable Connector
Designation	MIL-DTL Equivalent Reference	Shell/Insert	Pin-count	MIL-DTL Equivalent Reference	NAI P/N (for reference)
J2	D38999/20WF35SN	19 / 35	66	D38999/26WF35PN	05-0284-COM

Pinout

J2 Ethernet Connector Pinout

J2 Connector Pin	Signal	Notes
45	ETH5_TP0N	*1
46	ETH5_TP0P	*1
43	ETH5_TP1N	*1
44	ETH5_TP1P	*1
52	ETH5_TP2N	*1
53	ETH5_TP2P	*1
58	ETH5_TP3N	*1
51	ETH5_TP3P	*1
66	ETH6_TP0N	*1
65	ETH6_TP0P	*1
62	ETH6_TP1N	*1
63	ETH6_TP1P	*1
59	ETH6_TP2N	*1
64	ETH6_TP2P	*1
60	ETH6_TP3N	*1
61	ETH6_TP3P	*1
56	ETH7_TP0N	*1
57	ETH7_TP0P	*1
49	ETH7_TP1N	*1
50	ETH7_TP1P	*1
41	ETH8_TP0N	*1
42	ETH8_TP0P	*1
32	ETH8_TP1N	*1
33	ETH8_TP1P	*1
15	ETH9_TP0N	*1
16	ETH9_TP0P	*1
8	ETH9_TP1N	*1
9	ETH9_TP1P	*1
7	ETH10_TP0N	*1
3	ETH10_TP0P	*1
1	ETH10_TP1N	*1
2	ETH10_TP1P	*1
4	ETH11_TP0N	*1
5	ETH11_TP0P	*1
10	ETH11_TP1N	*1
11	ETH11_TP1P	*1
27	ETH12_TP0N	*1
28	ETH12_TP0P	*1
25	ETH12_TP1N	*1
26	ETH12_TP1P	*1
23	ETH21_TP0N	*1
24	ETH21_TP0P	*1
21	ETH21_TP1N	*1
22	ETH21_TP1P	*1
13	ETH22_TP0N	*1
14	ETH22_TP0P	*1
6	ETH22_TP1N	*1
12	ETH22_TP1P	*1
19	ETH23_TP0N	*1
20	ETH23_TP0P	*1
17	ETH23_TP1N	*1
18	ETH23_TP1P	*1
36	ETH24_TP0N	*1
37	ETH24_TP0P	*1
34	ETH24_TP1N	*1
35	ETH24_TP1P	*1
54	ETH25_TP0N	*1
55	ETH25_TP0P	*1
47	ETH25_TP1N	*1
48	ETH25_TP1P	*1
39	ETH25_TP2N	*1
40	ETH25_TP2P	*1
30	ETH25_TP3N	*1
31	ETH25_TP3P	*1
29	GND	Signal/System Ground
38	GND	Signal/System Ground

Notes

*1: TTE Switch Ethernet signal definitions:

      ETHnn_TPx(y) where:  
      nn = Ethernet Switch Port number  
      x = Twisted pair/differential signal number (0, 1, 2, or 3)  
      y = Differential signal polarity (P=positive(+) and N=negative(-))

10/100BASE-T ports use two twisted pairs (TP0, TP1). 10/100/1000BASE-T ports use four twisted pairs (TP0 through TP3).

J3, Maintenance, Configuration & Debug

The NIU2A-TT2 J3 37-pin Maintenance connector provides the TT2 TTE Switch module maintenance, configuration and debug signals: TTE Configuration Select [0..5], RS-232 management & debug port (TX, RX, SYSGND), I2C (SCL/SDA), and discrete controls (Power Down, Write Protect, External Reset, Watchdog Disable, Maintenance Mode, Ground Mode, Shop Mode).

Figure 8. J3 Maintenance, Configuration & Debug Connector Detail

Parts Identification

J3 Maintenance, Configuration & Debug Connector Definition

	Chassis (Box-level)			Mating Cable Connector
Designation	MIL-DTL Equivalent Reference	Shell/Insert	Pin-count	MIL-DTL Equivalent Reference	NAI P/N (for reference)
J3	D38999/20WD35SN	15 / 35	37	D38999/26WD35PN	05-0302-COM

Pinout

J3 Maintenance, Configuration & Debug Connector Pinout

J3 Connector Pin	Signal	Notes
1	TTE-CONF_SEL_4	TTE Configuration Select bit 4 (pull-up on module)
2	TTE-CONF_SEL_0	TTE Configuration Select bit 0 (pull-up on module)
3	TTE-CONF_SEL_1	TTE Configuration Select bit 1 (pull-up on module)
5	TTE-CONF_SEL_2	TTE Configuration Select bit 2 (pull-up on module)
7	WRITE_PROTECTn	Write Protect, active low (pull-up on module)
9	TTE-CONF_SEL_3	TTE Configuration Select bit 3 (pull-up on module)
11	SPARE3	Spare
13	MAINT_MODE	Maintenance Mode discrete (pull-down on module)
15	3.3_A	3.3 V (A)
16	SYSGND (RS-232)	RS-232 Serial Ground
17	EXT_RS232_RX	RS-232 Receive (maintenance/debug)
18	EXT_RS232_TX	RS-232 Transmit (maintenance/debug)
21	TTE-CONF_SEL_5	TTE Configuration Select bit 5 (pull-up on module)
23	PWR-DWNn	Power Down, active low (pull-up on module)
25	SYSGND	Signal/System Ground
26	GROUND_MODE	Ground Mode discrete (pull-down on module)
27	SHOP_MODE	Shop Mode discrete (pull-down on module)
28	EXT_RESET_INn	External Reset input, active low (pull-up on module)
29	WD_DISABLE	Watchdog Disable discrete
30	SYSGND	Signal/System Ground
31	SYSGND	Signal/System Ground
32	SYSGND	Signal/System Ground
33	SYSGND	Signal/System Ground
34	I2C_SCL	I2C Clock (pull-up on module)
35	I2C_SDA	I2C Data (pull-up on module)
36	SPARE4	Spare
37	SYSGND	Signal/System Ground

Note

DRAFT: J3 pins not listed above are No-Connect (verify against the released NIU2A-TT2 Interface Control Document prior to release). Discrete polarity, pull-up/pull-down provisions and electrical levels are to be confirmed. For definitions and use of the TTE Configuration Select and maintenance discretes with respect to the SMC2 Switch Module Core, contact TTTech (or the NAI factory).

J4, Ethernet Switch Ports (13-20 & 1-4)

The NIU2A-TT2 J4 66-pin Ethernet connector supports eight 100BASE-T TTE Switch ports (Ports 13 through 20) and four 1GBASE-T TTE Switch ports (Ports 1 through 4).

Figure 9. J4 Ethernet Connector Detail

Parts Identification

J4 Ethernet Connector Definition

	Chassis (Box-level)			Mating Cable Connector
Designation	MIL-DTL Equivalent Reference	Shell/Insert	Pin-count	MIL-DTL Equivalent Reference	NAI P/N (for reference)
J4	D38999/20WF35SA	19 / 35	66	D38999/26WF35PA	05-0285-COM

Pinout

J4 Ethernet Connector Pinout

J4 Connector Pin	Signal	Notes
53	ETH1_TP0N	*1
45	ETH1_TP0P	*1
37	ETH1_TP1N	*1
28	ETH1_TP1P	*1
58	ETH1_TP2N	*1
51	ETH1_TP2P	*1
59	ETH1_TP3N	*1
52	ETH1_TP3P	*1
54	ETH2_TP0N	*1
46	ETH2_TP0P	*1
47	ETH2_TP1N	*1
38	ETH2_TP1P	*1
65	ETH2_TP2N	*1
64	ETH2_TP2P	*1
61	ETH2_TP3N	*1
60	ETH2_TP3P	*1
56	ETH3_TP0N	*1
55	ETH3_TP0P	*1
48	ETH3_TP1N	*1
39	ETH3_TP1P	*1
66	ETH3_TP2N	*1
62	ETH3_TP2P	*1
57	ETH3_TP3N	*1
63	ETH3_TP3P	*1
31	ETH4_TP0N	*1
40	ETH4_TP0P	*1
33	ETH4_TP1N	*1
32	ETH4_TP1P	*1
50	ETH4_TP2N	*1
49	ETH4_TP2P	*1
42	ETH4_TP3N	*1
41	ETH4_TP3P	*1
14	ETH13_TP0N	*1
13	ETH13_TP0P	*1
16	ETH13_TP1N	*1
15	ETH13_TP1P	*1
8	ETH14_TP0N	*1
9	ETH14_TP0P	*1
6	ETH14_TP1N	*1
7	ETH14_TP1P	*1
10	ETH15_TP0N	*1
4	ETH15_TP0P	*1
17	ETH15_TP1N	*1
18	ETH15_TP1P	*1
25	ETH16_TP0N	*1
26	ETH16_TP0P	*1
34	ETH16_TP1N	*1
35	ETH16_TP1P	*1
22	ETH17_TP0N	*1
24	ETH17_TP0N	*1
21	ETH17_TP0P	*1
23	ETH17_TP0P	*1
2	ETH18_TP0N	*1
3	ETH18_TP0P	*1
5	ETH18_TP1N	*1
1	ETH18_TP1P	*1
11	ETH19_TP0N	*1
12	ETH19_TP0P	*1
19	ETH19_TP1N	*1
20	ETH19_TP1P	*1
36	ETH20_TP0N	*1
27	ETH20_TP0P	*1
43	ETH20_TP1N	*1
44	ETH20_TP1P	*1
29	GND	Signal/System Ground
30	GND	Signal/System Ground

Notes

*1: TTE Switch Ethernet signal definitions:

      ETHnn_TPx(y) where:  
      nn = Ethernet Switch Port number  
      x = Twisted pair/differential signal number (0, 1, 2, or 3)  
      y = Differential signal polarity (P=positive(+) and N=negative(-))

10/100BASE-T ports use two twisted pairs (TP0, TP1). 10/100/1000BASE-T ports use four twisted pairs (TP0 through TP3).

POWER-UP & OPERATIONAL DESCRIPTION

Panel LEDs & Functions

Front Panel LEDs indications.

Figure 10. NIU2A-TT2 Status LEDs Location

NIU2A-TT2 Status LEDs Function

LED	STATUS / FUNCTION
	ILLUMINATED	EXTINGUISHED
POWER (GRN):	Power-On (TBD)	Power-off
STATUS (RED/GRN):	TT2 Switch Module status indication, bi-color (TBD - contact TTTech/factory)
SYNC:	TTE synchronization status indication (TBD - contact TTTech/factory)
DEF CONF:	Default Configuration indication (TBD - contact TTTech/factory)

Note

DRAFT: Conferring with Engineering on full descriptions of LEDs.

ETHERNET WIRING CONVENTION

RJ-45 Pin	T568A Color	T568B Color	10/100Base-T	1000BASE-T	NAI wiring convention
1	white/green stripe	white/orange stripe	TX+	DA+	ETH-TP0+
2	green	orange	TX+	DA-	ETH-TP0-
3	white/orange stripe	white/green stripe	RX+	DB+	ETH-TP1+
4	blue	blue		DC+	ETH-TP2+
5	white/blue stripe	white/blue stripe		DC-	ETH-TP2-
6	orange	green	RX-	DB-	ETH-TP1-
7	white/brown stripe	white/brown stripe		DD+	ETH-TP3+
8	brown	brown		DD-	ETH-TP3-

TT2 TTE SWITCH MODULE - OVERVIEW

The NIU2A-TT2 is pre-configured with the TT2 Time-Triggered Ethernet (TTE) Switch Module, which is based on TTTech’s certifiable TTEthernet® SMC2 Ethernet Switch Module Core (Certifiable Flight Hardware). The following high-level information is based on the NIU2A-TT2 data sheet.

Ethernet Switching Capability

• 18x 10/100BASE-T ports
• 6x 10/100/1000BASE-T ports
• 1x 10/100/1000BASE-T Mirror port

Switch Processor Configurable Traffic Classes

The TT2 supports concurrent operation of three traffic classes:

• Best-effort traffic (IEEE 802.3)
• Rate-constrained traffic (full ARINC 664 Part 7 / AFDX®)
• Time-triggered traffic (SAE AS6802 Standard)

By supporting all three traffic classes, the NIU2A-TT2 configuration allows users of IEEE 802.3 Ethernet to upgrade to Deterministic Ethernet (ARINC 664 Part 7 AFDX® or Time-Triggered Ethernet SAE AS6802) protocols in the future without requiring hardware changes.

End System Interoperability

The NIU2A-TT2 seamlessly communicates with the NAI TE2, a single-port, tri-redundant, deterministic Ethernet communications End System module built on TTTech’s certifiable TTEthernet® IP core, enabling access to NAI’s COSA® family of products.

Configuration & Maintenance

Switch configuration selection and maintenance functions are supported via the J3 Maintenance connector, including the TTE Configuration Select discretes (TTE-CONF_SEL [0..5]), RS-232 management & debug port, I2C, and mode/control discretes (Maintenance Mode, Ground Mode, Shop Mode, Power Down, Write Protect, External Reset, Watchdog Disable). Refer to the J3 connector section of this manual for signal details.

Certifiable Artifacts Package

• To DAL A: DO-254, DO-178C (Pending - contact factory)

Note

This section intentionally provides only high-level information about the TT2 TTE Switch Module. Detailed information regarding the TTEthernet® SMC2 Switch Module Core - including switch configuration and loading, network design and scheduling, traffic class provisioning, synchronization, toolchain, and certification artifacts - is provided by TTTech. For more information, users should contact TTTech.

NIU2A-TT2 PART NUMBER DESIGNATION

For a complete breakdown of product configuration and option details, click here for the NIU2A-TT2 part number designation.

REVISION HISTORY

Revision Date	Description
2026-07-13	Preliminary draft of NIU2A-TT2 manual.

NAI Cares

North Atlantic Industries (NAI) is a leading independent supplier of Embedded I/O Boards, Single Board Computers, Rugged Power Supplies, Embedded Systems and Motion Simulation and Measurement Instruments for the Military, Aerospace and Industrial Industries. We accelerate our clients’ time-to-mission with a unique approach based on a Configurable Open Systems Architecture™ (COSA®) that delivers the best of both worlds: custom solutions from standard COTS components.

We have built a reputation by listening to our customers, understanding their needs, and designing, testing and delivering board and system-level products for their most demanding air, land and sea requirements. If you have any applications or questions regarding the use of our products, please contact us for an expedient solution.

Please visit us at: www.naii.com or select one of the following for immediate assistance:

Documentation

https://www.docs.naii.com

FAQ

http://www.naii.com/faqs

Application Notes

http://www.naii.com/applicationnotes

Calibration and Repairs

http://www.naii.com/calibrationrepairs

Call Us

(631) 567-1100

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