Enhanced 911 (E911) Service/NPA Relief
Type of Change:
On or about June 1, 1997, Bell Atlantic will implement a geographic split in the 201 and 908 New Jersey numbering plan areas (NPAs). This implementation increases the number of NPAs in the state of New Jersey from 3 to 5. The state of New Jersey E911 network is currently a standard E911 configuration that can only accommodate 4 NPAs and major changes will be required to accommodate more than four NPAs. Changes will be necessary to interconnecting carrier outpulsing formats, E911 tandem switch outpulsing formats, E911 database processes, and Public Safety Answering Point (PSAP) customer premises equipment (CPE). More information about the changes is provided in the impact statement below.
Date changes are to occur:
Permissive dialing for the new NPA codes 973 (201 area code relief) and 732 (908 area code relief) begins on or about June 1, 1997. The E911 changes described in this notice will be implemented at that time.
Location changes are to occur:
Changes are necessary to all switching systems and PSAP locations that interconnect with 0. the state of New Jersey E911 network and all tandem switches and databases that make up the state of New Jersey E911 network.
Reasonably foreseeable impact of changes.
All switching systems that interconnect with the state of New Jersey E911 network will have to be modified to outpulse the 10-digit callers emergency service identification (CESID) number to the enhanced 911 tandem switches using the following new protocol:
The automatic location identification (ALI) database will have to bemodified to process 10-digit CESID numbers.
- The MF signaling protocol between an end office and an enhanced 911 tandem switch will begin with the usual end-office seizure (off-hook) signal and the corresponding wink-start(140 to 290 millisecond off-hook) signal from the tandem switch.
- After receiving the wink-start signal and delaying a minimum of 50 milliseconds, the end-office should outpulse the new NPA sequence described below rather than the traditional KP-911-ST, KP-11-ST, or KP-1-ST sequences. The new NPA sequence will be KP-NXX-ST where NXX represents the NPA (area code) of the CESID (N is any digit 2 through 9, and X is any digit 0 through 9).
- After the enhanced 911 tandem switch receives the initial NPA sequence and is ready to receive the last 7-digits of the CESID, the tandem switch will return the usual CESID request (steady off-hook) signal.
- After the receiving the CESID request signal and delaying a minimum of 50 milliseconds, the end-office should outpulse the usual CESID sequence of KP-I-NXX-XXXX-ST where NXX-XXXX represents the last seven digits of the CESID (N is any digit 2 through 9, and X is any digit 0 through 9).
All enhanced 911 tandem switches in New Jersey will have to be modified to outpulse the new 10-digit CESID sequence described below to enhanced 911 PSAP locations. The new sequence will be KP-NXX-NXX-XXXX-ST where the first NXX represents the NPA (area code) of the CESID and where the subsequent NXX-XXXX represents the last seven digits of the CESID (N is any digit 2 through 9, and X is any digit 0 through 9). The information digit used in the current 7-digit CESID format (KP-I-NXX-XXXX-ST) will not be used in the new 10-digit CESID format.
All enhanced 911 PSAP CPE at locations that interconnect with the state of New Jersey enhanced 911 system will have to be modified to process the new 10-digit CESID format.
For more information contact:
John A. Guthmann
Specialist - Regional 911
13100 Columbia Pike
Silver Spring, MD 20904
(301) 236 - 8372