Nortel Networks 1000 User Manual

Page 673

Operation

673

Incoming calls

The far-end initiates calls as follows:

•

The ground is placed on the E lead in E and 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 244 "Operation Mode" (page 673)

—

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 244
Operation Mode

Operation mode

Start arrangement

Immediate start

IMM

Delay dial

DDL

Wink start

WNK

The far-end initiates calls as follows:

•

Ground is placed on the E lead in E and 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 may be operated in
any mode (immediate start, delay dial, or wink start), as assigned on a
start arrangement basis. See

Table 245 "Operation mode" (page 674)

—

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,

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008