Nortel Networks Video Gaming Accessories 553-3001-211 Manual De Usuario

 NT8D15 E&M Trunk card

The functions provided by each unit on the E&M trunk card include 2-wire 
signaling, 4-wire signaling, and paging operation as follows:

•

2-wire, E&M Type I signaling (see Figure 141 on 

) with:

— near-end seizure and outpulsing with M lead

— ground detection with E lead

— voice transmission through tip and ring for transmit and receive

•

4-wire, E&M Type I and II signaling (see Figure 142 on 

2-way dial repeating with:

— echo suppression for Type I signaling

— switchable 7 dB and 16 dB pads for carrier interface 

— voice transmission and reception through two separate paths

— Type I signaling through E&M leads

— Type II signaling with near-end seizure by SB/M leads and far-end 

detection by E/SG lead

•

4-wire, DX signaling (see Figure 143 on 

•

paging trunk operation (see Figure 144 on 

) with support access 

by low-resistance path at the PG/A1 leads

Note: Paging end-to-end signaling is not supported.