Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 47
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 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 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 5 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.
Table 5 Configuration Options for the 6-port FXS Adapter Card
Configuration Supported Options
Companding type Mu-Law (the default)
A-Law
Fault signaling Idle (the default)
Seized
Line balance Nominal (the default)
800
To Next Page
Loading...
