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FC (Flow Control) This indicator lights when the DataTalker has stopped channel data flow because the channel buffer is almost full. If the DataTalker stops data flow at the request of a remote device, the Flow Control Received (FCR) indicator also lights. If the DataTalker stops data flow for any other reason, the FCR indicator remains off. Data Flow Async Async Composite Channel Host Channel Host Link Remote Remote DeviceCPU DataTalker DataTalker FC LED ON FCR LED ON FC LED ON Flow Control COM (Command) This LED indicates whether the data or the command channel is selected. It lights when the command channel is selected (DIP switch 3 is down), and is off when the data channel is selected (DIP switch 3 is up). Chapter 3 - Front and Rear Panel Descriptions Voice/Fax Channels FXS (Foreign Exchange Station) This indicator lights when the voice/fax channel is configured for FXS operation. FXO (Foreign Exchange Office) This indicator lights when the voice/fax channel is configured for FXO operation. E&M (E&M Operation) This indicator lights when the voice/fax channel is configured for E&M operation (voice/fax channel 1 only). FAX (Fax) This indicator lights when there is fax traffic on the voice/fax channel. XMT Transmit. This indicator lights when voice or fax data is being transmitted. RCV (Receive) This indicator lights when voice or fax data is being received. XSG (Transmit Signal) This indicator lights when the FXS-configured channel is off-hook, the FXO-configured channel is receiving a ring from the telco, or the M lead is active when the voice/ fax channel is configured for E&M operation (i.e., the DataTalker is receiving a ring from the PBX). RSG (Receive Signal) This indicator lights when the FXS-configured channel is ringing or the E lead is active on the E&M-configured channel. Composite Link Status RXT (Retransmit) This indicator lights when the local DataTalker is retransmitting a block of data on request. The RXT indicator lights for both internal and external link devices. FCR (Flow Control Received) This indicator lights when the remote DataTalker’s buffers are full and the local DataTalker has been told to stop sending data. This indicator lights for both internal and external link devices. RD (Remote Down) This indicator lights when the local DataTalker cannot establish communications with the remote DataTalker. The RD lights for both internal and external link devices. TM (Test Mode) This indicator lights when one of the diagnostic tests is active. V35 (V.35 Interface) This indicator lights when the V.24/V.35 shunt is in the V.35 position. EXT (External) This indicator lights when the DataTalker is configured for an external composite link device (DIP switch 2 is down). MDM (Modem) This indicator lights when the internal composite link device is a modem. DSU (Data Service Unit) This indicator lights when the internal composite link device is a DSU. TA (Terminal Adapter) This indicator lights when the internal composite link device is an ISDN terminal adapter. CD (Carrier Detect) This indicator lights when the composite link detects a carrier signal from a remote DataTalker or a local external DSU or modem. RCV (Receive) This indicator flashes as data is being received from a remote DataTalker. The RCV indicator flashes for both internal and external link devices. XMT (Transmit) This indicator flashes as data is being transmitted to the remote DataTalker. The XMT indicator flashes for both internal and external link devices. CTS (Clear To Send) This indicator lights when the composite link device is ready to transmit data. The CTS indicator lights for both internal and external link devices. DataTalker Owner’s Manual 28.8/56 (28.8K bps/56K bps) This composite link speed indicator displays the baud rate of the internal modem (28.8) or DSU (56K). The type of composite link device is indicated by which of the EXT, MDM, DSU, or TA indicators lights. This indicator lights steadily when a DSU is installed. It has three states when an internal MMH2834 modem is installed (ON, flashing seven or eight times per second). When the LED is ON solid, it indicates a link speed of 33.6K bps. When the LED flashes eight times with a one second off time, the link speed is 31.2K and when it flashes seven times with a one second off time, the link speed is 28.8K bps. RTS/DTR (Request to Send/Data Terminal Ready) This dual function indicator functions as a Request To Send (RTS) indicator when a DSU is the internal composite link device or as a Data Terminal Ready (DTR) indicator when an internal modem or an ISDN terminal adapter is the composite link device. NS/DBUP (No Signal/Dial Backup) This dual function indicator functions as a No Signal (NS) indicator when a DSU is installed. It lights when no signal at all is received from a DDS line or when the signal is too weak for normal operation. When a 33.6K bps modem is selected as the composite link device, it functions as a Dial Backup (DBUP) indicator, lighting wh...

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