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DS0 Wholesale Local Platform Service – 2 Wire ISDN BRI
BellSouth Interconnection Services
Your Interconnection Advantage
SM
8
June 15. 2004
Version 1
digital loop, a DSO facility, directly into an ISDN digital switch port. These ports can only be
used for DS0 terminations on the line side of the switch. This DS0 Wholesale Local Platform
Service offering will be limited to the above arrangement.
DS0 Wholesale Local Platform Service – 2-Wire ISDN/BRI provides the Basic Rate Interface for
ISDN service at the point of demarcation. BRI provides the end user access of up to two 64
Kbps (B) channels and one 16 Kbps (D) channel per exchange access line.
The D channel carries the out-of-band signaling information associated with the B and D
channels.
B channel circuit switched services offer up to 64 Kbps intra-office transmission of voice or data.
This permits the end user to use circuit switched voice or data transmission paths on a per call
selection basis. Transmission on the B channel will be circuit switched at 64 Kbps within the
switch and/or equipped facilities between ISDN compatible central offices.
ISDN interconnection to non-ISDN equipped central offices is potentially subjected to analog
transmission or sub-rated to 56 Kbps. Each Access to a B channel for Circuit Switched
Voice/Circuit Switched Data (CSV/CSD) includes one directory number (DN).
The following are set parameters for B channel and D channel Switched Services:
• Each B channel terminal will be provided logical channels up to the technical capability
of the serving central office.
• Each logical channel can carry an independent call with throughput of up to 64 Kbps.
• Each D channel terminal will be provided logical channels up to the technical capabilities
of the serving central office.
The 2-wire digital loop is a dedicated digital transmission facility from the end-user to the
BellSouth switch. System Signaling 7 (SS7) or Multi-Frequency (MF) protocol may be utilized
across the network. The facility allows the end user to send and receive circuit switched voice
and circuit switched data telecommunications traffic. The DS0 2-Wire Digital Port is a dial-up
facility that provides signaling features, functions and capabilities of the line side termination of
the switch, hunting, and access to other services such as E911, PIC/LPIC options and routing.
The Selected Carrier Routing option, if chosen, allows the CLEC to route its end users’ calls to
the CLEC’s own Operator Services platform or its Business Office. The port also includes
switching functionality, which determines where the call needs to be terminated, and routes it
onto the interoffice transport-shared portion of the network. Calls that can be carried on these
services include: local 10 digit, Operator, Credit Card 0+ InterLATA toll, Credit Card 0+
intraLATA toll, 1+ InterLATA toll, 1+ intraLATA toll, Local Directory Assistance, Long Distance
Directory Assistance, 1+800 Inter- and intraLATA, and 1+900.
Usage data is available via CLEC subscription to Access Daily Usage File (ADUF) and Optional
Daily Usage File (ODUF). To receive ADUF messages, CLEC must have Network Data Mover
(NDM) software, which is available from BellSouth.