3725 HDA FXS/FXO SRST

[bblaze1]

We are currently deploying a 3725 solution to our branch offices. We went with the Cisco recomended HDA-FXS card as it would shunt to 1 pair on the interface card to a b1 line in a total power failure so there could still be 1 phone that could have access to emergency services. I am looking for the pin configuration of the card so I know which pair to plug the b1 line into.

[tringwelski_2]

Table 17-3: RJ-21 Connections for the High-Density Analog Voice Network Module

RJ-21 Connector

Pair Tip Conductor Ring Conductor NM-HDA Port Network Module Reference

1 26 1 0 FXS

2 27 2 1 FXS

3 28 3 2 FXS

4 29 4 3 FXS Base card

5 30 5 4 FXS FXO

6 31 6 5 FXS FXO

7 32 7 6 FXS FXO

8 33 8 7 FXS FXO

9 34 9 8 FXS Unused

10 35 10 9 FXS Unused

11 36 11 10 FXS Unused

12 37 12 11 FXS Unused

13 38 13 12 Unused Unused

14 39 14 13 Unused FXO failover Expansion board in slot 0

15 40 15 14 FXS FXO

16 41 16 15 FXS FXO

17 42 17 16 FXS FXO

18 43 18 17 FXS FXO

19 44 19 18 FXS Unused

20 45 20 19 FXS Unused

21 46 21 20 FXS Unused

22 47 22 21 FXS Unused

23 48 23 22 Unused Unused

24 49 24 23 Unused FXO failover Expansion board in slot 1

25 50 25 -- Unused