Black Box 5000 series Reference Manual page 49

Considerations:
The state of the Logical ISDN type option is saved when performing a software upgrade. This means that
when the P1700 restarts, it will return to the operation state that was enabled before the upgrade was
performed.
The following options appear if an ISDN module is present and Logical ISDN Type is set to Digital_Leased:
4 – Frame Relay
The Frame Relay option allows you to select between a frame relay circuit or a PPP leased circuit to configure the router
to match the type of service connected to this interface module.
Default: If International software loaded: [disabled] – router is in Leased Line mode.
If North American software loaded: [enabled] – router is in FrameRelay mode.
The router will request confirmation of the change when this menu item is selected, enter "yes"
Considerations:
The state of the Logical Leased type option is saved when performing a software upgrade. This means that when the
P1700 restarts, it will return to the operation state that was enabled before the upgrade was performed.
5 – Frame Relay Set-Up
The Frame Relay Set-up option takes you to the Frame Relay Set-up menu where frame relay LMI parameters may be set.
Note: this option appears only if the ISDN Type is set to Digital Leased and FrameRelay is enabled.
5/6 - Phantom Power Detect
Most NT-1s provide a signal to the connected ISDN device to indicate that the NT-1 is powered up and functioning
correctly. This signal is generally called phantom power. Some NT-1s do not support phantom power. This option
should be disabled if the NT-1 connected to the ISDN link module does not support phantom power.
If the P1700 is having difficulty obtaining a connection to the NT-1, this option should be disabled.
Default: [disabled]
Considerations: This option will not appear when the link module is an ISDN type U interface.
6/7 - Link B Channel
When the digital leased circuit option is configured on an ISDN BRI link, the ISDN B-channels must be assigned to
link numbers for normal operation. When a B-channel on the BRI is assigned to a link number, the P1700 then treats
the ISDN B-channel as a 64 Kbps leased line connection. If only one B channel is set to digital leased and the other is
set to ISDN, then the B channel is automatically assigned and is not changeable (B1 for even link numbers, B2 for odd
links). If both B channels on the BRI are set to digital leased, the B channels may be assigned as follows:
Link 1 may be assigned B-channel 1, B-channel 2 or both.
If link 1 is assigned B-channel 1, the other channel is available to service link 2 on the ISDN module; if link 1 is
assigned B-channel 2, the other channel is not available.
This option is available only when the Digital Leased Circuit option is enabled.
Menus Reference Manual: Link Set-Up Menu
49