Nortel DMS-100 Series Maintenance Manual page 50

2-30 Star Remote System hardware
ISDN hardware. For this reason, the host LTC+, LGC+, or RCC2 does not
require the installation of the enhanced ISDN signaling preprocessor (EISP) or
enhanced D-channel handler (EDCH) cards.
The ILD-R communicates directly with the LTC+, LGC+, RCC2 over two
separate message channels that connect the ISDN drawer controller (IDC) to
the LTC+, LGC+, or RCC2. These message channels are independent of Star
Hub message channels which support
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The IDC provides the LAP-D termination. Circuit-switched messages that
originate at the ISDN loop are converted to DMSX protocol by the IDC and
transferred to the LTC+ or LGC+. Packet switched messages are converted to
frame switching and transferred to the packet handler through the network.
The ILD-R has 32 LAPD links, 28 for ISDN loops and four for other purposes.
The ILD-R contains flash memory and can be loaded while in the in-service
state.
The ILD-R supports intraswitching in the Star Hub. ISDN lines are not
supported during Star Hub emergency stand-alone (ESA). If the Star Hub
enters ESA, all ISDN calls are released.
User interface commands are available to support the added functionality
required by the ILD-R. These user interface commands are discussed in the
"Star Remote Hub user interface" chapter in this manual.
To upgrade a POTS line drawer to an ISDN line drawer in the Star Hub
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Note: This procedure does not cause other drawers to be removed from
service.
297-8353-550 Standard 05.01 March 2001
loading the IDC
Q.931 signaling messages between the terminal and the LTC+, LGC+, or
RCC2
maintenance and provisioning messages to the IDC
downloading parameters to ISDN terminals
delete all lines from that drawer
remove the POTS line drawer from service
physically replace the POTS line drawer with an ILD-R
declare the new ILD-R and return the ILD-R to service