Single Line Long Loop Adapter - Viking extend analog PABX station loop length to 30,000 feet - Turn a standard station into an on-premise or off-premise extension - Give any low voltage line or station from an ISDN terminal, KSU, PABX, etc. the talk battery and ringing power of a standard CO line - Convert a polarity reversal DC ring signaling line to a typical 20Hz AC ringing line - Convert an analog KSU/PABX station to a standard voltage OPX - Provides 48 VDC talk battery - Provides 20 HZ, 10 REN sine wave ringing - Passes Caller ID information - Passes hook switch flash - DTMF and pulse dialing compatible - Passes CPC signals - Electrically isolates PABX station from extended loop - Provides additional lightning and surge protection - Selectable ring protocols VKLLA1