High-Performance Parallel Interface

HIPPI Description

The HIPPI specification defines the mechanical, electrical and signalling protocol for a high performance simplex interface [data transmits in one direction only]. An additional HIPPI interface is required to transmit data in a full-duplex mode.

Parallel HIPPI operates bi-directionally (point to point) at 100 MBps [HIPPI-800] or with a throughput of 200 MBps [HIPPI-1600], up to 25 meters, using copper cabling [wire]. Serial HIPPI will run at 100 MBps [HIPPI-800 Serial], or 200 MBps [HIPPI-1600 Serial] using coaxial cable for distances up to 25 meter, and fiber optic cabling for distances up to 1K meter (Multi Mode) or 10K meters (Single Mode) HIPPI-6400 will run at 1.6Gbps [1.2 Gbaud rate]. The term HIPPI-800 means 800M bits per sec or 100M Bytes per sec, HIPPI-1600 refers to 1600 Bits per sec or 200M Bytes per sec. The HIPPI specification defines the physical layer and is used with LAN [Local Area Networks]. The data bus consists of either 32 bit data lines [D00 to D31] or 64 bit lines [D00 to D63].

Parallel HIPPI (HIPPI-PH) [PH is Physical] uses two 100 pin shielded twisted pair (STP) cables [50 twisted pairs, 28AWG wire], using differential ECL [copper wire interface]. Of course by definition all Emitter Coupled Logic [ECL] devices require Trace Termination. The Drain wire is also 28AWG, and the Braid shield wire is 36AWG. The HIPPI cables are grounded at both ends via the cable shield and connector shell bond. The pin out is defined in the HIPPI-PH Specification.
HIPPI-6400 is also termed Super-HIPPI, and may also be produced under the commercial name of Gigabyte System Network 'GSN'.

A HIPPI-PH channel transmits data in one direction [simplex interface], two channels are required for full-duplex operation.
The HIPPI interface is a point-to-point bus that does not support multi-drop operation. Data runs in bursts, each burst contains between 1 and 256 words.

HIPPI Standards and Specifications

ANSI X3.183-1991: High-Performance Parallel Interface - Mechanical, Electrical, and Signaling Protocol Specification (HIPPI-PH)
ANSI X3.210-1992: High-Performance Parallel Interface - Framing Protocol (HIPPI-FP)
ANSI X3.218-1993: High-Performance Parallel Interface - Encapsulation of ISO 8802-2 (IEEE Std 802.2), Logical Link Protocol Specification (HIPPI-LE)
ANSI X3.222-1993: High-Performance Parallel Interface - Physical Switch Control Specification (HIPPI-SC)
ANSI X3.283-1995: Encapsulation of Frames of the Fibre Channel Physical and Signalling Interface (HIPPI-FC)

HIPPI Working Documents, www.hippi.org/cDOCS.html {not active}
Also try the Technical Committee T11 [www.t11.org] for HIPPI information

Also refer to the Fiber Channel page.

HIPPI IC Manufacturers

HIPPI uses Differential ECL ICs. A listing of ECL [Emitter Coupled Logic] Manufacturers may be found on the;
ECL Standard Logic page, or for all other IC Manufacturers, or select the components icon below.

HIPPI ECL Interface Circuit
HIPPI ECL Interface Circuit

All HIPPI lines are Differential ECL as shown in the graphic above. Of course the nominal voltage levels over the HIPPI interface are normal ECL voltage levels.
Each differential signal is transmitted over a twisted-pair conductor. The far end termination is 110 ohm resistor [+/- 2%] as shown in the graphic.
The cable impedance is 108 ohms

Editor note; I'm not sure what usage HIPPI gets within the industry at this point.
The last specification shown above dates back to 1996.
However after you give a few years to get products released, and a few more years for them to be adopted, HIPPI might not be that old.
Although when a standard isn't updated after some number of years it may give an indication that interest has dropped.

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Modified 6/13/15
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