MULTI-FUNCTION LD CARD
NOTE
We cannot guarantee that the Card will accurately detect small pieces of flat satin cable in the line if they are farther than 1500 ft. (457.2 m) from the local modem.
C.If one wire among the four twisted-pair wires is broken, the Error LED and the green CD LED will both light on at least one of the modems.
5.2.2DETECTING STREAMING ERRORS
When the Multi-Function LD Card is not in test mode (its green Test LED is dark), the front-panel Error LED can also indicate streaming errors. When the Card’s antistreaming circuitry is enabled (one or both of switch S3 positions 7 and 8 set to “On”), the RTS signal from the attached DTE is timer- controlled. The timer begins to count down when the DTE raises RTS. If RTS remains high for longer than the preset timeout period, the antistream circuit will force RTS low. The Error LED will light, indicating a streaming condition (RTS continually on). This feature prevents a malfunctioning terminal from tying up a computer port in a multidrop or polling environment.
When the DTE drops RTS, the antistreaming timer is automatically reset and the Error LED goes dark. The timeout period is user-selectable for 12.5 or 50 seconds. See Section 3.1.4.
5.3 Power-Up
There is no power switch on the Multi-Function LD Card: Power is automatically applied to the Card whenever—and for as long as—its card- edge connector is plugged into the MicroRack’s mid-plane socket and the MicroRack’s power supply is turned on.
NOTE
The Multi-Function LD Card is a “hot-swappable” card—it will not be damaged by plugging it in or removing it while the rack is powered up.
