Zhone 3921Plus Installationshandbuch

You have accessed an older version of aParadyne product document.Paradyne is no longer a subsidiary ofAT&T. Any reference to AT&T Paradyneis a

9The following customer-supplied equipment is required for the installation of a Model 3921Plus modem:• A COMSPHERE 3000 Series Carrier.• A 50-pin ma

10Connecting Model 3920Plus Modems with Supplied CablesFigure 3 shows how Model 3920Plus modems are connected to certain TELCO jack types using the ap

11Model 3920Plus 4-Wire/2-Wire Leased-Line ConnectionUse the following procedures to connect a Model 3920Plus to the leased-line network interface:1.

12Power Supply ConnectionUse the following procedures to connect the modem to an ac power outlet:1. Make sure the modem’s power switch is in the OFF p

13Using the Diagnostic Control Panel (DCP)The DCP’s liquid crystal display (LCD) consists of two 16-character lines which display modem status, contro

14Model 3921Plus Modem InstallationCAUTIONIf the Model 3921Plus is removed from the carrier, always use aground strap when handling the modem. Always

15Figure 4. Installing a Model 3921Plus ModemIf the modem is to communicate with an installed SDCP, install the modem as described above and perform t

166. Once you have determined that the modem is installed properly and completed its power-up self-test,rotate the circuit pack lock until it covers t

17Removing and Replacing Model 3921Plus ModemsCAUTIONIf the Model 3921Plus is removed from the carrier, always use aground strap when handling the mod

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Paradyne1COMSPHERE 3900 Series ModemsModels 3920Plus and 3921PlusInstallation InstructionsDocument Number 3920-A2-GK41-10April 1995OverviewThe COMSPHE

2Important Safety Instructions1. Read and follow all warning notices and instructions marked on the product or included inthis document.2. This produc

3NoticesGovernment Requirements and Equipment ReturnFor regulatory approval, refer to the product labeling or contact your local AT&T Paradyne rep

43. The ringer equivalence (REN) is used to determine the quantity of devices which may be connected to thetelephone line. Excessive RENs on the telep

5CanadaNOTICE TO THE USERS OF THE CANADIAN PUBLIC SWITCHED TELEPHONE NETWORKThe Canadian Department of Communications label identifies certified equip

6COMSPHERE 392xPlus ModelsThe 392xPlus family is available in two models: the Model 3920Plus, a 4-wire/2-wire standalone modem, and theModel 3921Plus,

7Carrier-Mounted Model 3921Plus 4-Wire/2-Wire ModemThe carrier-mounted Model 3921Plus modem (Figure 2) installs into a COMSPHERE 3000 Series Carrier.

8The Model 3921Plus derives ac power from the COMSPHERE 3000 Series Carrier’s backplane, which is acommon bus to all devices installed in the carrier.