Digital Data Ports
available for Internet connection, or for alternate routes or carriers. Doubling the bandwidth capacity of a conventional digital channel bank allows the Access Bank II SNMP to dedicate the built-in V.35 DCE data port to Internet, video, or Wide-Area Network (WAN) applications, while also performing such advanced networking tasks as Drop and Insert (D&I), and DS-0 Digital Access & Cross-connect Switching (DACS). Both diagnostic CSUs are fully integrated, respond to all standard inband and out-of-band network loop codes, and can be polled for ANSI T1.403 one-second Performance Report Messages (PRMs) or AT&T 54016 Maintenance Messages over the 4 Kbps ESF Facility Data Link (FDL).
1.5 Digital Data Ports
1.5.1 V.35 DCE Port
To fully utilize the extra bandwidth supplied by the dual T1 interfaces, the Access Bank II SNMP has a built-in V.35 DCE data port for connection to Wide Area Network (WAN) devices such as Internet routers and Frame Relay Access Devices (FRADs). This high-speed serial interface supports syn- chronous data connections from 56 Kbps to 1.536 Mbps, all rates. When used in conjunction with the internal BER tester, the V.35 interface is also capable of generating V.54 loop codes for activating and deactivating remote loopbacks in DCE devices at the far-end. The intervening transmission link then can be stress tested using a selectable range of industry standard QRSS patterns (QRSS, All Zeros, All Ones, 511, 2047, 215-1, 220-1, 2023-1, etc.). Use of the V.35 DCE port requires an optional V.35 data cable.
1.5.2 RS-232 Data Port
The Control Panel of the Access Bank II SNMP also contains an RS-232 secondary data port that can be configured to provide a 56/64 Kbps synchronous data channel for connection to SNA cluster con- trollers, data multiplexers, routers, or SCADA (Supervisory Control and Data Acquisition) links.
When configured for asynchronous operation, this same RS-232 data port can also be used, alter- nately, to implement a point-to-point dedicated communications channel between two Acess Bank II units at 1.2, 2.4, 4.8, 9.6, 14.4, 19.2, 28.8, 38.4, or 57.6 Kbps rates. Use of the RS-232 data port requires an optional dual purpose RS-232 user data and management cable.
1.6 Analog Line Interfaces: FXS, & FXO, and 4-Wire E&M
To meet individual site-specific communications requirements, the Access Bank II SNMP can be equipped with a full range of “hot-swappable” slide-insert analog line interface cards. Please contact CAC for details and availability of these and other card options:
•The Foreign Exchange Station (FXS) 12-channel voice card delivers high quality loop- start or ground-start dial tone telephone line connections to key systems, Off Premise Extensions (OPXs), facsimile machines, modems, PBXs and other conventional analog telephone devices.
•The Foreign Exchange Office and Dial Pulse Termination (FXO/DPT) voice card com- pliments the FXS by supplying 12 standard loop-start or ground-start telephone line con-
