Nortel Networks 553-3001-211 Type II signaling, Operation Mode Operation mode Start arrangement

NT8D15 E&M Trunk card Page 633 of 894

Incoming calls

The far-end initiates calls as follows:

•The ground is placed on the E lead in E&M signaling.

•Dial pulses are subsequently applied from the far-end as ground open on the E lead.

•If the far-end is equipped for sending, the system can operate in any mode (immediate start, delay dial, or wink start), as assigned on a start arrangement basis. See Table 192.

—In immediate start mode, there is no start signal from the called office. The seizure signal (off hook supervisory state) from the far-end should be at least 150 ms. At the end of the seizure signal, the far-end can start pulsing after the standard delay (normally 70 ms minimum).

—In delay dial mode, a 256–384 ms off hook/on hook signal is returned to the far-end immediately after receipt of the seizure signal. When the far-end detects the on hook signal (start signal), the far-end can start pulsing after the standard delay (normally 70 ms minimum).

—In wink start mode, within a 128–256 ms period after receipt of the seizure signal from the far-end, the called office transmits a 250 ms, wink start, off hook/on hook signal to the calling office.

Table 192

Operation Mode

Operation mode	Start arrangement
Immediate start	IMM
Delay dial	DDL
Wink start	WNK

E&M Type II signaling

Figure 148 on page 635 shows E&M Type II signaling patterns for incoming and outgoing calls. Figure 149 on page 636 shows Type II signaling patterns

Circuit Card Description and Installation