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How many Users does a Reader Expander retain when in offline mode?

Issue

Reader Expander loses communications to the SP-C, how are Users authenticated when they attempt to access Doors controlled from this Reader Module?

Environment

Security Expert

SP-C

SP-RDM2

Cause

The existing documentation is a bit vague on exactly which Users will still have access through Doors when the Reader Expander is offline to the Controller.

Resolution

There are three options with how to handle access when the Reader Expander is in offline mode (not communicating with the Controller).

 

1. No Users

Under Reader Expander | General tab > Offline Operation, the “No Users” option removes access for any cards badged at these Readers. no one will have access while the Reader Expander is offline to the Controller.

 

2. Any Card

Under Reader Expander | General tab > Offline Operation, the “Any Card” option allows for any card at all to be granted access when the Reader Expander is offline to the Controller. This is the least secure option as anyone with a valid tehnology card that the Reader can read will be granted access.

 

3. First 10 Users plus Cache

Under Reader Expander | General tab > Offline Operation, the “First 10 Users plus Cache” option allows for the below Users to be granted access when the Reader Expander is offline to the Controller.

  • The first 10 Users in that Controllers Database.
  • The last 150 Users that have badged with valid access.

 
Note: If RS-485 readers are used on the Reader Expander then this offline cache is extended to the first 35 users downloaded to the Controller + a rolling cache
(FIFO) of 150 of the last users to access the door.
Our design has utilized reader expanders that not only allow us to use the high security encrypted RS-485 reader
interface, but give us an extended offline cache of the first 35 users downloaded to that Controller + a rolling cache
(FIFO) of 150 of the last users to access the door.
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Revision #:
2 of 2
Last update:
‎2018-09-10 11:05 AM
Updated by:
 
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