tec.News - Harting

PHYSICAL LAYER SPECIFICA-
TION PICMG 2.5
Since the PICMG is responsible for
all CPCI-relevant specifications,
the H.110 recommendations of the
ECTF were integrated into the
Computer Telephony Specification
PICMG 2.5.
The 6SU standard board for computer
telephony on the Compact-
PCI bus contains the following
connectors:
• P1/J1 carries the 32-bit PCI bus
(the connector is Type A in compliance
with IEC 61076-101)
• P2/J2 contains the other connections
for the 64-bit PCI bus
(the connector is based on IEC
Type B, but in a shorter version)
• P3/J3 is not defined for CPCI-CT
but can be used for additional
input and output signals
• P4/J4 carries the CT bus to H.110
(the connector is IEC Type A)
• P5/J5 is reserved for input and
output signals to other equipment
in the network, which are
fed from the rear of the equipment
to the bus (the connector
is based on IEC Type B, but in a
shorter version)
SPECIAL CHARACTERISTICS
OF CONNECTORS AND
MODULAR SYSTEM
CT rack cards can be positioned directly
next to other rack cards in
the modular system. Coding elements
at P4/J4 ensure correct positioning.
For easier recognition, a colour coding
has been introduced in addition
to the physical contour: strawberry
red is defined for CT rack cards.
The input and output signals at position
P5/J5 can be fed via 80 millimetre
deep rear I/O transition boards
in compliance with IEEE P1101.11.
This permits a very compact housing
design with continuous screening of
the housing. With the aid of the I/O
transition boards, line terminations
and circuits can, for example, be integrated
for preparation of the incoming
and outgoing signals, or the
cable connectors can be simply
adapted to customer requirements.
The signal connection from the I/O
transition boards to the CT backplane
is via har-bus ® HM female
connectors and a guide shroud,
which is pushed onto the rear long
connection posts of the J5 connector.
To guide and centre the male
and female connectors in relation to
each other, a type complementary
to the standard, bearing the type
designation AB, is used at this point.
LOOKING TO THE FUTURE
The extremely rapid pace of development
in communications and
information technology will accelerate
still further in the new millennium.
Increasing bit rates and
falling signal levels are leading to
new requirements for signal integrity
and screening in connection
technology. For this reason,
the decisive factor influencing the
quality of a connector will be optimised
signal transmissions, which
depends on exact knowledge of
the influencing factors. HARTING
utilises Spice, IBIS and other models
for close-to-real simulation of
products. Consequently the harbus
HM marks the beginning of
a new generation of electronic
connectors.
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