Instruction manual

Hardware Overview
30 025-9416
Table 5. Operation of Front Panel LEDs
Blinking ON/OFF Conditions
Not during normal operation. Blinks intermittently during boot-up cycle. Short flash every 3 seconds indicates ZLINK connection is active, but no data is being transferred. Blinks intermittently during boot-up cycle. Short flash every 3 seconds indicates ZLINK connection is active, but no data is being transferred. Blinks during end-to-end and pulse telco calls Blinks during DID DTMF telco calls. Blinks twice at beginning of boot-up and then flickers rapidly at end of boot cycle.
Solid ON Conditions
Whenever power is on and boot-up cycle is complete. May flicker rapidly enough to appear solid-on during data transfers. May flicker rapidly enough to appear solid-on during data transfers. During DID DTMF telco calls. When the trunk is initially answered and during active telco calls. When the trunk is initially answered and during active telco calls. During most of initial boot-up cycle. During pulse telco calls and DTMF digit decoding When sending analog pages. When sending digital pages. When the transmission equipment asserts a busy condition (pin 41 of trunk and radio station interface connector).
Description
Indicates the Model 640 is powered up and ready for operation. Indicates local ZLINK communication between the office computer (or dumb terminal) and the Model 640. Indicates modem ZLINK communication between the office computer and the Model 640. Indicates the trunk (phone line) is in use; that is, loop current is being drawn from a DID telco line. Indicates trunk supervision (answer status) between the CO and the Model 640. Indicates digit feed or voice activity on the trunk. Indicates paging (voice or tones) transmission to radio station. Indicates paging (binary digital) transmission to radio station. Indicates the radio channel is busy. The transmitter may be shared (cross-busy applications).
LED Label
READY COM MODEM LINE ANS ACT ANA PTT DIG PTT BUSY