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Dataprobe T-APS Rack User Manual

Page 13

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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