Table of Contents
Advertisement
Functional Block
DTMF Receiver
On-board Ringer
On-board DC/DC Power
Supply
Power Failure Forwarding
Function
Self-Diagnostic Function
ASIC
Controller
LED Display Circuit
External Interface
Connector
5. NAMES AND LOCATIONS
Overview
Inside View
Eight lines for each port
20/25Hz 75Vrms
Phase control (Three-phase / Four-phase)
Input +15V
Output +15V, +5V, +3.3V
Two lines supported
Carried out with outsire-line interface in a pair (DHLC8 card has only
Speech path test, Dial pulse test, DTMF test
EC bus interface function
CT bus interface function, Digital PLL function
Local bus interface function
Time switch function, Gain controlling function, DPRAM function
Private telephone controlling interface function
Parallel IO function
CPU
SH-1/SH7020 (12.288MHz)
Flash ROM
1 Mbyte
SRAM
256 kbyte
Card status indicating LED: Two colors (Red/Green)
Extension
50pin Amphenol connector: 1
interface
Power failure
4pin modular jack: 1
forwarding
6
Functional contents
Advertisement
Table of Contents
