Nortel 1000 Installation And Commissioning Manual page 285

Figure 89
ISL in dedicated mode using leased line
ISL in dedicated mode using dialup modem
The requirements are as follows:
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Copyright © 2003-2007, Nortel Networks
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NTAK02 SDI/DCH D-channel handler interface.
Modems such as the Ventel 2400, Hayes 2400 (the Hayes Smartmodem
2400 cannot be used on leased lines) or Gandalf 2400 that can support
2 or 4-wire leased line operation. 4-wire operation must be specified
when ordering. Otherwise, modems are factory shipped for 2-wire
operation. Modems capable of the following:
— autodial capability
— minimum of 2400 baud
— synchronous operation
— programmable so that one modem originates the call while the other
auto-answers
NTAK19BA 4-port SDI cable.
NT8D09 500 set line card.
Nortel Communication Server 1000
ISDN Primary Rate Interface Installation and Commissioning
NN43001-301 02.03 Standard
Release 5.5 7 December 2007
ISL hardware requirements 285