Figure 36: ISL in dedicated mode using leased line
ISL in dedicated mode using dial-up modem
The requirements are as follows:
•
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
• NT8D09 500 set line card.
Overview
ISDN Primary Rate Interface Maintenance November 2011 167
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