Dataprobe T-APS Rack User 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