Troubleshooting guide

Configuration Rules F-1
F. Configuration
Rules
Appendix F
Configuration Rules
When used with the new SLMO interface card, the Optiset E series
offers significant flexibility with option module configurations. Each
SLMO port can support two active B-channels. Each device uses a
separate primary telephone number known as a directory number
(DN). This capability enables applications such as 128 kbps desktop
video.
The following list identifies configuration rules:
• Each port can have a maximum of 3 directory numbers (DNs)
assigned to any combinations of telephones and data devices.
• In addition, each data device can support 1 alternate voice data
(AVD) directory number (DN) so that a total of 5 DNs can be
assigned to a given port.
• Only Primary Phones support the ISDN Adapter, Analog Adapter,
and Phone Adapter.
• You can configure an Analog Adapter or a Phone Adapter, but not
both.
B-channel Contention
B-channel contention can occur when both B-channels are active on
non-voice calls. When B-channel contention occurs the base telephone
cannot make or receive voice calls.
When B-channel contention occurs and the user attempts to use the
phone, the user will hear a fast busy signal and (if the phone is
equipped with a display) the message TRY AGAIN LATER appears
in the display.
B-channel contention can occur when the ports are over configured by
attempting to use all of the capability available. In other words, it may
be possible to configure 5 DNs to a port, but the user may not be
satisfied with the resulting performance. The customer, system
administrator, and end user should take this into account when
deciding the optimum configuration for a given port.