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tones. The end offices route calls to DAIS II on dedicated (direct) trunks.
These direct trunks can carry ANI traffic or ONI traffic, but not both.
If trunk concentrators are used, the concentrator trunks to DAIS II
may carry ANI calls, ONI calls, or both, depending on the types of trunks
coming into the concentrators from the end offices. The call is identified as
ANI or ONI through MF tones transmitted by the concentrators.
If an operator must be involved (due to ONI or further assistance),
DAIS II routes the call to the telco's ACD (Automatic Call Distributor), which
is a switching device that routes calls to any available operator.
The intercept data base resides on disk in the ARS (Audio Response
System). ARS processors known as Audio Response Controllers (ARCs) search the
intercept database. If a call requires an operator's services, the Marker
Decoder Unit (MDU) provides ACD routing information to the ARC.
The DAIS II Automatic Intercept Communications Controllers (AICCs)
route messages between the ARCs and the DAIS II subsystems. An intercept
subsystem that is housed at the same location as the database is called a
Colocated Automated Intercept System (CAIS). A subsystem located at a
distance from the database is known as a Local Automated Intercept System
(LAIS). Each subsystem can provide automated announcements without using
expensive trunking to route ANI calls to a centralized intercept office. Only
calls that require operator assistance are routed on trunks to the ARS site.
Because those trunks are only held white the operator identifies the number
and are released before the announcement begins, trunk requirements are
reduced. The automated announcement is always given by the intercept
subsystem.
Each CAIS or LAIS site contains a Trunk Time Switch (TTS) and DAIS II
Audio Response Units (DARUs). Intercept trunks from the concentrators and the
Class 5 End Offices terminate at the TTS. When an ONI call comes in on one of
these trunks, the TTS routes it to the ACD. When an ANI call comes in, the
TTS routes the called number to the ARC. After the ARC retrieves the
appropriate message from the database, it sends that information back to the
TTS, which connects a DARU port to the trunk on which the call came in. Then,
the DARU produces an automated announcement of the message and delivers it to
the caller. ARS hardware generates only DA announcements whereas DAIS II
hardware generates only intercept announcements.
Automatic Intercept Communications Controller (AICC)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The AICC routes messages between the ARC and the TTS. Two units are
required to enhance system reliability. Each pair of AICCs can communicate
with up to 4 CAIS or LAIS subsystems.
The AICCs are similar to the Audio Communications Controllers (ACCs)
in the ARS system, but AICCs use a Bisynchronous Communications Module (BSCM)
instead of a LACIM.
An AICC can be equipped with up to 8 BSCMs, each of which handles one
synchronous communication line to the TTS. The BSCM models selected depend on
the location of the AICC with respect to the CAIS/LAIS sites. Standard SLIMs
(Subscriber Line Interface Modules) are required for communication with the
ARC.
Trunk Time Switch (TTS)
~~~~~~~~~~~~~~~~~~~~~~~
The TTS has two types of components: the Peripheral Modules (PMs) and
the Common Controls (CCs).
The PM contains the printed circuit boards that provide the link
between the end office's ANI trunks and the ARC and between the ONI trunks and
the ACD. The activity of the PM is under direction of the CC
A PM rack contains five types of circuit boards: Multi-frequency
Receivers (MFRs), Analog Line Front Ends (ALFEs), T1 Front Ends (T1FEs),
Peripheral Module Access Controllers (PMACs), and Multi-purpose Peripheral
Devices (MPPDs).
The MFRs translate the intercepted number from multi-frequency tones
to ASCII digits for ANI calls; for ONI calls that come through a trunk
concentrator, the MFRs translate the tones sent by the concentrator to
indicate an ONI call. Based on the tones, the MFR determines the type of
call: regular, trouble, etc.
ALFEs convert incoming analog data to digital form so that it can be
switched on the digital network. They also convert outgoing digital data back
to analog. Incoming ALFEs provide the link between the TTS and the analog
trunks from the Class 5 End Offices. Outgoing ALFEs provide the link between
the TTS and the analog trunks to the ACD.
ALFE is subdivided into two types for both incoming and outgoing:
ALFE-A (contains the control logic, PCM bus termination, and ports for 8
trunks) and ALFE-B (contains ports for 16 trunks, but must be paired with an
ALFE-A in order to use the control logic and PCM bus on the backplane).
ALFE-As can be used without ALFE-Bs, but not vice versa.
Incoming ALFEs support E&M 2-wire, E&M 4-wire, reverse battery, and
3-way signalling trunks. Outgoing ALFEs support E&M 2-wire, reverse battery,
and high-low trunking.
T1FEs provide the links between the TTS and the D3-type T1 spans from
the end offices. They also link the DARU VOCAL board ports and the TTS. Each
board has 24 ports in order to handle a single T1 span which carries 24 voice
channels.
PMAC is based on a Motorola 68000 microprocessor that directs and
coordinates data flow within the PM.
MPPD boards provide bus termination and the system clocks for the