more topics

Automatic Route Selection (ARS) Feature

Enhanced 911 Service

E911 Adjunct

The second way to support Enhanced 911 service is to have calls routed through trunks connected to an auxiliary piece of equipment called the "E911 adjunct." You can assign up to five trunks to be E911 Adjunct trunks.

When a user calls 911, the ground-start or loop-start trunk sends the extension information to the E911 adjunct. The E911 adjunct reads the extension information and sends the appropriate telephone information out to the 911 Emergency Service. If the E911 adjunct cannot decipher the extension information, it should send the main billing telephone number and billing address. If all the trunks programmed for E911 service are busy, the call is routed through the main pool.

When the E911 adjunct detects an error condition (such as the disconnection of the trunk cable between the E911 adjunct and the PSTN), the contacts on the front panel ALARM relay close. You must wire this ALARM relay to a system tip/ring extension jack and then program that extension jack as an E911 Adjunct Alarm extension. An E911 Adjunct Alarm extension uses the Hotline feature to place a call automatically to the system operator when the ALARM relay contacts close. This causes an alarm LED to light on the operator's console and places the E911 Adjunct trunks into a Trunk Maintenance Busy state. While the E911 Adjunct trunks are in this state, any 911 calls go directly to the main pool. A major alarm error is also generated. See the "Maintenance and Troubleshooting" chapter in the Installation, SPM, Maintenance, and Troubleshooting Guide for further information.

E911 Adjunct trunks can be loop-start trunks or ground-start trunks with the following exceptions. However, ground-start trunks can only be used on modules with upgradeable firmware (the 800 GS/LS-ID module and the 408 GS/LS-MLX-ID module).

• No Music-On-Hold trunks
  
  
• No Loudspeaker Paging trunks
  
  
• No data trunks
  
  
• No maintenance alarm trunks
  
  
• No unassigned T1 trunks
  
  
• No PRI lines that are not assigned to a B-channel group
  
  
• No PRI lines assigned as the D-channel
  
  
• No trunks used in pools
  
  
• No trunks used as Personal Lines
  
  
• No trunks assigned to an E911 partition

Follow these steps to program the E911 Adjunct option:

1. Program the E911 adjunct equipment according to its user manual.
   
   
2. Assign ground-start (recommended) or loop-start trunks to the E911 adjunct.
   
   
3. Connect the E911 adjunct to the ground-start or loop-start trunks assigned to it.
   
   
4. Assign the E911 Adjunct Alarm Extension and the extension number (the first operator position is the factory setting) to which the E911 Adjunct Alarm calls will be sent.
   
   
5. Connect the E911 adjunct alarm relay to the E911 Adjunct Alarm extension.
   
   
6. Change the E911 Option to "E911 Adjunct."
   
   

   Do not enable the E911 Adjunct option until after the E911 adjunct has been connected and tested, the Adjunct Alarm port has been connected, and the E911 Adjunct trunks and the E911 Adjunct Alarm have been programmed.

   
   
   
7. Enable "Allow-11" as desired.
   
   
8. Remove 911 from any of the programmable ARS tables.
   
   
9. Create an Allowed List with 911 and assign it to Outward Restricted and Extension Status Restricted extensions that should be allowed to call the 911 Emergency Service.
   
   
10. Program an operator Alarm button on any operator Direct-Line Consoles (DLCs).

Topics
	Description
	Tables Programmable Tables Star Codes & Automatic Route Selection Wild Card Characters in 6-Digit Tables ARS Restrictions for VMI Ports How ARS Works Table Selection Route Selection Within the Table Subpatterns Restrictions
	At a Glance
	Enhanced 911 Service
	E911 Partition E911 Adjunct Allow-11
	Considerations & Constraints
	System Programming
	Mode Differences
	Feature Interactions