Nortel-networks Circuit Card Manual do Utilizador Página 634

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Page 634 of 906 NT8D15 E&M Trunk card
553-3001-211 Standard 3.00 August 2005
Trunk circuit features
Trunk unit functions
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 144 on page 635) 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 145 on page 636),
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 146 on page 637)
paging trunk operation (see Figure 147 on page 638) with support access
by low-resistance path at the PG/A1 leads
Note: Paging end-to-end signaling is not supported.
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