6-port FXS Adapter Card

The 6-port FXS Adapter card provides the capability of transporting a large number of voice circuits from one 7705 SAR location and terminating them at another 7705 SAR location that is connected to a PBX.

The card can also be configured for a Private Line Automatic Ringdown (PLAR) application, which is typically used outside of a PBX network, in order to provide a site-to-site or remote site-to-control center hotline functionality.

The card has six Foreign Exchange Subscriber (FXS) ports. Each port provides a short-reach, on-premises analog interface to an analog telephone set. After an incoming analog signal from a set is terminated on one of the FXS interfaces, it is converted into a digital 64 kb/s Pulse Code Modulation (PCM) format using either Mu-Law companding (North America) or A-Law companding (Rest of World).

The signal is then mapped into the E1 Channel Associated Signaling (CAS) transport scheme for A-Law or the T1 Robbed Bit Signaling (RBS) transport scheme for Mu-Law and transmitted using a Cpipe over any 7705 SAR network interface that supports the Cpipe service. For standard TDM, the network interface can be a T1/E1 or OC3/STM1 channelized interface. For MPLS, an Ethernet, T1/E1, OC3/STM1 channelized MLPPP, or OC3/STM1 clear channel interface can be used.

For a PBX application, the signal is terminated at the 7705 SAR hub location that is connected to a PBX by either an FXO interface or a T1/E1 interface (assuming the signaling formats are compatible). The FXO interface can be provided by either an 8-port FXO Adapter card or 8-port Voice & Teleprotection card that is installed in a 7705 SAR-8 Shelf V2 or 7705 SAR-18 chassis at the 7705 SAR hub location.

For a PLAR application, the signal is terminated on an FXS interface on either another 6-port FXS Adapter card or an 8-port Voice & Teleprotection card that is installed in a 7705 SAR-8 Shelf V2 or 7705 SAR-18 chassis that is located at a remote location, or terminated on a 3600 MainStreet or 1511 MAX. The connection is made over an E1 interface (3600 MainStreet or 1511 MAX) or a T1 interface (3600 MainStreet). A hotline call can originate from a 3600 MainStreet or 1511 MAX and terminate on an FXS interface on a 6-port FXS Adapter card (or on an FXS interface on an 8-port Voice & Teleprotection card).

Table: Configuration Options for the 6-port FXS Adapter Card shows the configuration options available on a 6-port FXS Adapter card. The companding law type is configured at the card level; the other options are configured at the voice port level.