Ovrrbu-bts. Pdf

AirLink 8000
1/30/00
BASE TRANSCEIVER STATION
Release 1.00
2 - 6
1.2.2 OVERALL SYSTEM
For purposes of understanding the placement of the BTS in the AirLink 8000 system, the following
diagram shows all of the elements of the Eagle AirLink 8000 system: 
The four main elements are the BTS, CPE, DSCO and EMS:
 

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AirLink 8000
1/30/00
BASE TRANSCEIVER STATION
Release 1.00
2 - 7
1.3 Hardware Description.
There are three primary subsystems in the Eagle Telephonics, Inc.’s AirLink 8000 system — the Eagle
Telephonics, Inc. Digital Switching Central Office (DSCO), Base Transceiver Station (BTS), and
Customer Premises Equipment (CPE). The CPE itself has three primary components — the Subscriber
Unit (SU), the Network Termination Unit (NTU), and the Uninterruptible Power Supply (UPS). The
DSCO and the BTS share the Eagle Management Suites (EMS) for all OAM&P functions, central office
control and subscriber programming. The DSCO connects to the public telephone network via analog or
digital trunks. The BTS connects to the DSCO using E1 trunks and to its master antenna using a coaxial
cable. The SU communicates with the BTS via the radio interface. At the customer premises the NTU
serves as the connection point between the SU and the subscriber’s standard telephony termination point,
and the UPS interfaces to the subscribers primary power using a standard cable. Further details are
presented below along with appropriate diagrams.
1.3.1 Digital Switching Central Office
The Digital Switching Central Office (DSCO) is the system’s interface to the public network. Its primary
purpose is to provide the specific protocols and signaling that are required by the public network. These
protocols can vary by the country as well as by the customer and even by the connecting point in the
network.
The DSCO can connect to a maximum of 15 RBUs using 1 to 4 E1 connections per RBU with 4 E1s
needed for a fully populated RBU. In addition, each DSCO may be configured for a maximum of 10,000
subscribers. Time Slot 16 on each E1 trunk is used for passing control information between the DSCO
and the attached RBUs as well as for passing information to and from the controlling EMS. Specific
functions provided by the DSCO include:
-- Provisioning of dialtone to the Subscriber Units
-- Set up and tear down of voice and data calls
-- Billing system interface
-- Call priority management (drop least priority when all channels are used)
-- Channel reassignment for calls in progress
-- Detection of hook flash to enable POTS+ calling features
-- 32 to 64 kbps rate change initialization
-- Pay phone capability (12/16 kHz tone detection, line reversal)
-- Priority and emergency number calling
-- Accommodation of country specific signaling interfaces such as E&M, R2, R2 variants, V5.1, V5.2, C7, 
and C7 variants
-- System modularity: analog/digital options for both line side and trunk side
-- Full redundancy and hot swap for all circuit cards 
Note: See the Eagle Telephonics, Inc. Installation and Maintenance Manual (IMM) for complete details of
operation and description for the DSCO.

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