Frame Relay Async Polling Frad, BPF Broadcast Polling FRAD, SCADA FRAD

Frame Relay Broadcast Polling FRAD

BPF Async FRAD designed for polling SCADA networks

  • Allows async multipoint polling over frame relay networks
  • Async RS-232 interface up to 57.6 (38.4 Kbps on 8, and 16 port units)
  • Sync RS-232 composite to 128 kbps
  • Use for financial, traffic control, SCADA networks
  • Internal DSU option for 56 or 64 Kbps
  • Units with 1, 4, 8, or 16 ports, Conitel units with one or two ports
  • Simple to configure for DLCI drop mapping
  • Often more cost effective than multipoint polling modem networks
  • Supports DNP3, Modbus and other async byte oriented protocols (even 11 bit words)
  • Special firmware available for 31 bit Conitel and synchronous protocols
  • Automatic Backup Version available for dial or private line backup


Indicators (front panel)
Data Ports




The DCB BPF Frame Relay Broadcast Polling FRAD (frame relay access device) is a FRAD for async networks that will accommodate almost any byte oriented async polling protocol. Proven protocols include DNP-3, Modbus ASCII, Modbus RTU, Telegyr, Harris, and many others. A special version of the BPF supports the 31 bit Leads and Northrup Conitel Protocol. The FRAD encapsulates async polling protocols into frame relay format for private or public frame relay networks. The BPF is easily configured. A host BPF port is simply mapped to the remote DLCIs that will receive the host polling data. No detailed knowledge of the SCADA system's internal polling protocols is required.

The BPF makes it easy to convert async polling networks from multipoint modems to frame relay networks. Analog line facilities are being priced out of the market by digital facilities. At the same time, async polling system speed requirements are increasing from 1200 to 9600 bps and faster. Remote terminal units are becoming more capable, more data must be exchanged from the host to the remote units for financial, traffic control and SCADA networks. The BPF is the ideal product for this requirement. It supports async port speeds up to 57.6 Kbps and synchronous frame relay composite speeds to 128 Kbps.

The BPF is often more cost effective than analog high speed fast polling modems. Frame relay networks are becoming less expensive than analog networks, DSU's are less expensive than modems. The hardware cost savings provides a compelling reason to use the BPF.

The BPF can have 1 or 4 ports wite up to 40 DLCI's defined per port or 8 or 16 ports with up to 20 DLCI's defined per port. For example, a BPF-04 unit can be used to create 4 different SCADA polling networks via DLCI mapping using the same frame relay network. For systems larger than 16 host ports, a host frame relay switch is used. Contact DCB for more details. This allows multiple SCADA systems to be used over the same wide area network. For example, a power load-control system and substation automation systems may be run simultaneously over the same BPF system.

The BPF toggles RS-232 control leads as data goes out the port, and turns them off milliseconds after the data has exited the port. It also keeps blocks of up to 1024 bytes together, blocks that are output contiguously to avoid time out errors common to SCADA polling systems. This is the only FRAD that we've found to be totally reliable with SCADA protocols.

A one port BPF reads the DLCI number automatically from the frame relay network full status message. The larger BPF units require that the DCLI be explicitly set. The DLCI numbers can be duplicated on the ports of the multi-port BPF, allowing it to be used as a sharing device at a remote location.

Special firmware is available for 31 bit Conitel and similar synchronous protocols. The BPF reads the long data words and transmits them to the far end via frame relay. The 31 bit long data words are reconstructed at the far end and sent on to the RTU. DCB can supply 202T FSK modems for older RTU's that have embedded FSK modems.

The BPF firmware may also be customized for special and one-of-a-kind protocols. Versions are available for 11 bit word protocols, Racal Redac, and other protocols.

Another special version provides for automatic private line or dial line backup. If the frame relay link is lost, the remote BPF will automatically check the private line port and the dial up port to establish a backup link. When the frame relay link is re-established, the BPF automatically drops the dial backup link and reverts to frame relay again. Click here for a data sheet on how the backup operates. Standard firmware allows for redundant hosts, even at different locations.

BPF units have timers, buffers, control signal handling and data checking to accommodate typical SCADA equipment. And, with an internal DSU, you get the entire package in a single enclosure.

Controls and Indicators (front panel)
Front panel push button for loopback
Setup via the "Port One Setup", activated by the front panel push-button, or setup via rear panel setup port. (Use to define polling protocol and map DLCI addresses).
Indicators: Power, Activity, Line Error, Modem Ready, Port 1 Setup, Loopback
Network Management Port
Interface: CCITT V.24, RS-232-D
Connector: RJ-45 (8-wire)
Can be mapped to Port 1
Network Management Port to terminal cable included
Data Port
Power requirements: 120 VAC, wall mount power supply is standard. 220 VAC, 12 VDC, 48 VDC, 125 VDC also available, 18 Watts Temperature: -40 to +70 C for all DC supplies, up to +50C for 120 VAC & 220 VAC supplies. Hi-temp 120 VAC & 220 VAC supplies are special order 10 1/4" x 9 3/4" x 2 1/4" One Pound
56 Kbps internal DSU/CSU 12 VDC, 24 VDC, 48VCD, or 240Vac Power Supply

Rear view of DCB SR-01-BPF


Order the base BPF unit and any optional power supply you need. If an internal DSU is required, order
either the 56 Kbps or the 56/64 Kbps internal optional DSU.

Need it fast?  Buy on-line or call toll free 800-432-2638!

Item Number Description Price Buy Now!
BPF-01 Frame Relay Async Polling FRAD, 1 port, w/ 120VAC Power supply $ 775 Qty:
BPF-04 Frame Relay Async Polling FRAD, 4 ports, w/ 120VAC Power supply $ 1,125 Qty:
BPF-08 Frame Relay Async Polling FRAD, 8 ports, w/ 120VAC Power supply $ 2,125 Qty:
BPF-16 Frame Relay Async Polling FRAD, 16 ports, w/ 120VAC Power supply $ 4,250 Qty:
BPF-BUFrame Relay Async Polling FRAD, Automatic Backup Version $ 1,125 Qty:
BPF-12VDCOptional 12 VDC (9-18 VDC) power supply in place of standard power supply $ 75 Qty:
BPF-24VDCOptional 24 VDC (19-36 VDC) power supply in place of standard power supply $ 75 Qty:
BPF-48VDCOptional -48 VDC (36-72VDC) power supply in place of standard power supply $ 75 Qty:
BPF-125VDCOptional 125 VDC power supply in place of standard power supply $ 125 Qty:
BPF-125VDCOptional 220-240 VAC power supply in place of standard 120VAC power supply $ N/C Qty:
BPF-DSU-64 Factory installed internal 56/64 Kbps DSU option for BPF $ 325 Qty:

Data Comm for Business Inc.
2949 County Road 1000 E
Dewey, Il 61840
Voice: 217-897-6600
Toll Free: 800-4-DCB-NET
Toll Free: 800-432-2638
Email: Contact Page
Fax: 217-897-8023
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