ADC Kentrox ISDN NT1 1010 Especificaciones descargar pdf (Pagina 56)

2-2

Reference Guide

Model No.

Running Head

Sample Applications Applications

2.2 Sample Applications

2.3 Voice Modules and Applications

2.3.1 Foreign Exchange Station (FXS) Card

This integrated access system supports two variants of Foreign Exchange Station (FXS) cards:

•

8129 FXS Card provides eight 2-wire analog ports with a terminating impedance of 600

ohms.

•

8125 FXS Card provides four 2-wire analog ports with a terminating impedance of 600

ohms.

FXS cards can be installed in any User Slot in the system chassis. FXS cards encode the

incoming analog voice signals into 64 Kbps PCM format before transmission onto the

network. Each FXS card provides a single 50-pin female AMPHENOL connector (RJ27X).

All port parameters are software configurable on a port by port basis. The Mode setting

specifies whether the port is to be used for standard Foreign Exchange Station, Foreign

Exchange Software Defined Network, Private Line Automatic Ringdown (PLAR), or Dial

Pulse Origination applications. For example in the case of a PLAR circuit, the port can be

programmed to provide Ringback Tone towards the caller. The Type setting specifies Loop

Start, Loop Forward, Ground Start, Ground Start Immediate and Ground Start Automatic

operation. If the PLAR mode is selected, then the two options supported under Type are "D3"

and "D4" which meet the pre-1988 and post-1988 specifications for PLAR circuits. The PCM

Coding options supported include

-Law, A-Law and inverted A-law, and the user may also

select the Trunk Conditioning mode (busy or idle) that should be applied towards the attached

equipment should the WAN facility that the port is connected to fails. In addition, both the

Transmit (Tx) and Receive (Rx) TLP levels can be set in increments of 0.1 dB. The Tx TLP

range is from -10.0 dB to +5.0 dB. The Rx TLP range is from -10.0 dB to +2.0 dB.

The user may also specify, on a port-by-port basis, whether to use North American ANSI

standard ABCD signaling (which is the default) or ITU (CCITT) ABCD signaling by turning

the signaling conversion setting "on" or "off". The trans-hybrid balance may be specified as

one of eight values as well as for a customized user-specified terminating impedance. At the

present time, all eight values are identical and are set for a terminating impedance of

[email protected]µF in the case of a Model 8125 or 8129 FXS card.

Software-initiated testing and diagnostics supported on FXS cards include the setting of both

analog and digital loopback towards the network and the generation of a Digital MilliWatt

(DMW) signal on a port-by-port basis. A robust set of Test functions allow the user to monitor

and set the state of the analog Tip and Ring leads of any FXS port and to set and monitor the

state of the ABCD signaling bits of the digitized voice signal. In cross-connect systems, the

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