Specifications

Reference Guide 3-81

System Configuration and Operation WAN Card Redundancy

Figure 3-65. Typical WAN Port Redundancy Switch in CPU RCON System

3.22.2 Cross-Connect WAN Card Redundancy Switching

In cross-connect systems, WAN redundancy requires a WAN-R DUAL card in slot W4 (as

marked on its faceplate ejector). This card becomes a redundant card for the WAN cards in

slots W1 through W3 if it is equipped with matching DSX/CEPT, CSU, or HDSL modules,

and if those modules are installed in the same positions on both WAN cards. This protection

scheme is known as 1-in-N redundancy. When a switch occurs, a relay on the WAN-R card

switches the output of that card to the corresponding pins on the WAN connector of the

Interface card.

The following restrictions apply to cross-connect WAN redundancy:

You must install the WAN-R card in slot W4 for redundancy.

If you install it in slot W1,

W2 or W3, it will work only as a standard WAN card with two ports.

If the plug-in modules on the WAN-R card do not match those on a card in slot W1, W2,

or W3, the WAN-R card will not behave as a backup for that active WAN card.

The

system will not reject the card, but it will not switch even if the active WAN card fails.

If a standard WAN card is in slot W4, the system does not support WAN redundancy.

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Slot Installed Status Slot Installed Status

C1 CPU RCON IF INTF+modem

C2 U1 ALR ssss

P1 U2 E&M 4Wx8-6 ssssssss

P2 U3 FXS 2Wx8-9 ssssssss

P3 U4 FXO 2Wx8-9 ssssssss

W1 DSX+DSX rr U5 HSU 366x2 ss

W2 CEPT+CEPT aa U6 OCU-DPx5 sssss

W3 CSU+CSU as U7 FRAD-10 ssssssss

W4 DSX+DSX aa U8 SRU 232x10 ssssssssss

F1 PS1 R1 RINGER

F2 PS2