Paradyne manual Comsphere 3000 Series Carrier

COMSPHERE 3000 Series Carrier

Make sure that all devices installed in each half of the carrier are configured with compatible digital/leased-line, dial/dial backup, or switched 56 kbps backup interfaces.

All devices installed in a particular carrier half must be capable of interfacing to the leased-line network, dial network, or switched 56 kbps digital service using the common interface connections on the rear of the carrier (see Figure 3-27). The digital/leased-line interface is provided through a 50-pin connector, while the dial/dial backup and switched 56 kbps backup interfaces are provided through Network Interface Modules (NIMs). The dial/dial backup interface NIMs are available with either Permissive or Programmable mode. The switched 56 kbps backup interface is provided through one of the Switched 56 NIMs, either the 2-wire or 4-wire version. A NIM must be selected for half a carrier if any devices in that half of the carrier use the dial backup or switched

56 kbps backup interface. The NIM selected defines the pinouts of the dial or switched 56 kbps connection for all devices within that half of the carrier.

When devices are mixed, it is recommended that they be clustered together, and that dial/lease modems be installed from the left, starting with Slot 1.

•When dial/lease modems are mixed with DSUs in the same half of the carrier (i.e., Slots 1± 8 or Slots 9 ±16), the dial/lease modem's leased-line connection may not occur on the proper pins; therefore, cross-connection may be required at the network interface.

•When populating the same half of the carrier with all DSUs with dial or 2-wire switched 56 backup

capability, the DBM network interface module (NIM) is used. When populating it with all dial/lease modems or a combination of DSUs with dial backup capability and dial/lease modems, the

DDDNIM must be used. Both NIMs are available in permissive or programmable versions. In addition, when populating it with all DSUs with 4-wire switched 56 kbps backup capability, the 4-wire Switched 56 NIM must be used.

The remainder of this section provides the following information:

•Digital or analog leased-line network interfaces

•Dial network interface

•Switched 56 kbps network interface

•COMSPHERE 3811 control interface

A number of possible interconnection schemes are available from the network interface connections to the network interface.

Figure 3-28 illustrates the cabling connections for a dial/lease modem, such as the Model 3811 or 3911.

Figure 3-29 illustrates the cabling connections for a DSU or a DSU with a V.32 or 2-wire Switched 56 DBM.

Figure 3-30 illustrates the cabling connections for a DSU with a 4-wire Switched 56 DBM.

3-38 December 1994 3000-A2-GA31-80