Dataprobe T-APS Rack - Manual (Page 13)

T1/E1 Auto Protection Switch 1+1, 1:1 or Blind
Comparison Chart
Item Function 1+1 1:1 Blind 1 Blind 2
1 Switching Time (within) 12ms 25ms 12ms 12ms
2 Ability to retrieve protection path status (Good or Bad)
from CO or CPE. No Yes No No
3 Ability to provide protection path status (Good or Bad)
from LOS only Yes Yes Yes No
4 Manual switching to working path on both ends (CO or
CPE) No Yes No No
5 Single Ended Application Yes No Yes Yes
6 Duplicate CPE Signal in both Active and Protective
Path Yes No Yes No
Note: Referring T-APS installed in both CO to CPE sides
CO: Central Office
CPE: Customer Premises Equipment
Redundant CPE Applications
The T-APS can be used for switching a T1/EI circuit between two sets of CPE for redundant equipment
operation. The Working Mode selection can be either 1+1, Blind 1 or Blind 2.
In the 1+1 and Blind 1 modes, TX signals from the CO will be present at each of the two CPE devices.
In Blind 2 mode only the current selected working path will see the TX signals. The alternate path will not
provide TX to it’s associated CPE while the Protective Path is working.
CO to Dual CPE
CO
T1/E1
CSU/DSU
CPE
T1/E1
T1/E1
CSU/DSU
CPE
T-APS
E S C
E n t e r
Auto Protection Switch
Dataprobe Inc T-APS
T - A P S
ACO
R u n 1:1 E 1 T 1 L 1 L 2 L O S OOF AIS R A I Fail 1:1 CHK ACO LOS OOF RAI AIS
Active Path
Protection Path
T1/E1
T1/E1