HSSI Bus Description, EIA612, EIA613. High Speed Serial Interface pinout

HSSI

High Speed Serial Interface

[HSSI Description]
[HSSI Specification] [HSSI ICs]
[HSSI Connectors] [HSSI Cable] [HSSI Equipment]
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High Speed Serial Interface Description "HSSI"

HSSI operates at a maximum rate of 52Mbps [bits per second] using differential ECL [Emitter Coupled Logic].
Data is transmitted over shielded twisted pair [STP] cable (similar to SCSI II) with a maximum distance of 50 feet.
HSSI uses a DTE/DCE interface.
The Termination resistor is 110 ohms +/- 10 ohms.

HSSI Bus Electrical Interface Circuit implementation

HSSI Physical Interface

HSSI Online Standard

HSSI has been released in two sections; The physical layer as EIA-613, and the electrical layer as EIA-612.

EIA/TIA-613 HIGH SPEED SERIAL INTERFACE FOR DATA TERMINAL EQUIPMENT AND DATA CIRCUIT-TERMINATING EQUIPMENT.
Defines the physical layer specification. [1993]

EIA/TIA-612 ELECTRICAL CHARACTERISTICS FOR AN INTERFACE AT DATA SIGNALING RATES UP TO 52 MBIT/S.
Defines the electrical layer specification.

{HSSI Bus Index}

HSSI Bus Interface IC's

Uses Differential ECL [Emitter Coupled Logic] devices, Driver and Receiver; 10K and 100K series.
Possible Differential ECL receivers include 10H115, 10H116 [1vp-p max], or 10H125.
Possible Differential ECL drivers include 10H109, or 10H124.

ECL device Manufacturers
All other IC typesIC Manufacturers

{HSSI Bus Index}

HSSI Bus Connectors

The connector is a Micro D 50 pin, high density (50 mil), SCSI II type. 50-pins at 2 rows by 25 pins.
EIA613 defines the dimensions of the connector, but does not provide an example commercial style.
Reference part numbers: Plug type; Tyco 749193-2, Receptacle type; Tyco 749075-5, 749903-5.
Note that HSSI does use the same connector type as SCSI II, but the cable impedance is different.
SCSI II has a cable impedance of 70 ohms while HSSI impedance needs to be 110 ohms.

Connector Manufacturers {SCSI II Champ style connectors}

HSSI Style Connector

**HSSI Pinout** 50-pin Micro-D connector
Signal name		Pin # +	Pin # -
SG	Signal Ground	1	26
RT	Receive Timing	2	27
CA	DCE Available	3	28
RD	Receive data	4	29
LC	Loopback Circuit C	5	30
ST	Send Timing	6	31
SG	Signal Ground	7	32
TA	DTE Available	8	33
TT	Terminal Timing	9	34
LA	Loopback Circuit A	10	35
SD	Send Data	11	36
LB	Loopback Circuit B	12	37
SG	Signal Ground	13	38
--	Reserved	14 - 18	39 - 43
SG	Signal Ground	19	44
--	Reserved	20 - 23	45 - 48
TM	test Mode	24	49
Pin pairs 5 and 30, 14 and 39 to 18 and 43, and 20 and 45 to 23 and 48 are reserved for future use. To allow future backward compatibility, no signals or receivers of any kind should be connected to these pins.

{HSSI Bus Index}

HSSI Bus Cable

The HSSI cable is a 25 twisted-pair multi-conductor cable with an impedance of 110 ohm cable impedance.
The Wire Gauge 28AWG, using 7 strands of 36 AWG wire.

Cable Manufacturers

{HSSI Bus Index}

HSSI Equipment Manufacturers

HSSI devices will handle: NxT1, NxE1, T3 (45 Mbps), E3 (34 Mbps), and Synchronous Optical Network (SONET) STS-1 (51.82 Mbps) rates.

Emerging Technologies has a PCI Plu-in card w/ 1 HSSI port, Desk top/Rack mount HSSI (T3) Router.

{Back to High Speed Serial Interface [HSSI] Bus Index}


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