PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 9
PEB2085
Manufacturer Part Number
PEB2085
Description
ISDN SubscribernAccess Controller
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.PEB2085.pdf
(320 pages)
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General Information
Introduction
®
The PEB 2085/2086 ISAC
-S implements the four-wire S/T interface used to link voice/data
terminals to an ISDN.
The PEB 2085 combines the functions of the S-Bus Interface Circuit (SBC: PEB 2080) and the
ISDN Communications Controller (ICC: PEB 2070) on one chip.
The component switches B and D channels between the S/T and the ISDN Oriented Modular
®
(IOM
) interfaces, the latter being a standard backplane interface for the ISDN basic access.
The device provides all electrical and logical functions of the S/T interface, such as: activation/
deactivation, mode dependent timing recovery and D channel access and priority control.
The HDLC packets of the ISDN D channel are handled by the ISAC-S which interfaces them
to the associated microcontroller. In one of its operating modes the device offers high level
support of layer-2 functions of the LAPD protocol.
The ISAC-S is a CMOS device, available in a P-DIP-40 (PEB 2085 only), P-LCC-44 and
P-MQFP-64 (PEB 2086 only) package. It operates from a single + 5 V supply and features a
power-down state with very low power consumption.
Semiconductor Group
9
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