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CG-EWCG-001 Wireless E911 Guide
Issue 3, January 6, 2004 Network Specifications and Ordering
3.3.2 Data Connections Required For Wireless Carrier Owned Hardware - Phase 1
Only
In addition to the Type 2C CAMA or SS7 trunks, the Wireless Carrier will be required to purchase
two(2)data link connections from their protocol conversion hardware directly to the BellSouth ALI Host
computers. Two(2) data links are required because the BellSouth ALI Host computers are mated pairs
for redundancy, and are located in different locations for diversity.
These data links are 9.6 or 19.2 Kbps asynchronous or up to 56Kbps synchronous for X.25. The Secondary
Channel feature is required in order to deploy end-to-end diagnostic and configuration capability from
the master end (BellSouth Data Center) without disruptive consequences. The characteristics of the
equipment used to modulate the data links are:
• Sub-rate digital Channel Service Unit/Data Service Unit (CSU / DSU) compatible with
Memotec SC56
• 10 bit data character
-
1 start bit
- 8 data bits (8th bit ignored)
- 1 stop bit
• Full Duplex
• Continuous Carrier
For additional information and details concerning the data interface, please refer to the following document
which can be found on website www. interconnection.bellsouth.com/guides/html/tech_ref.html: and may
be amended from time to time:
TR 73610
BELLSOUTH E911 REAL-TIME DATA INTERFACES FOR WIRELESS AND
COMMERCIAL MOBILE RADIO SERVICE (CMRS) CONNECTION
In most cases, these data links will be interlata / interstate connections. As such, they must be ordered
through the Wireless Carriers Interexchange Carrier of choice. The BellSouth portion of these circuits
will be provisioned and maintained through the appropriate BellSouth Interexchange Access Customer
Advocacy Center (ACAC).
Wireless Carriers must work with Intrado to ensure wireless solutions are compatible with the supported
interfaces to the BellSouth ALI host computers.
3.4 Wireless Phase 2
BellSouth supports the implementation of Wireless E911 Phase II through the nondiscriminatory access to
its ALI database for those companies wishing to provide Mobile Position Center (MPC) functionality. For
the purposes of this document, GMLC and MPC are considered equivalent although a GMLC is unique
to a GSM environment. This access is facilitated through the BST ALI Interface. The MPC is defined
as the network entity that provides location information to the ALI database. Each MPC provider must
execute a contract with BellSouth. This contract must be signed and in place prior to testing Phase II.
Wireless Carriers should ensure they have contracted with an MPC provider prior to negotiating Phase
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