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BRI-SET, Various Adjuncts
Issue 1 June 2005 709
The TN2208 ESAI MFB provides the system with an Ethernet interface to Adjunct-Switch
Application Interface (ASAI) and Avaya adjuncts (for example, CONVERSANT
®
Voice System).
This circuit pack contains 8 ports of line circuit interface, each of which operates with two B
channels (referred to as B1 and B2 throughout this section) and one D channel. In this context,
the term ``ISDN-BRI port'' is used to refer collectively to ports on the TN2208 MFB circuit pack
that is connected to ASAI or Avaya adjuncts. The TN2208 ESAI MFB is handled by switch
software as it is an ISDN BRI compatible board and every maintenance action referring to ASAI
and Avaya Adjunct Links in this section applies.
In G3iV1.1-286 and G3iV2-386, two types of ISDN-BRI endpoints may be connected to
ISDN-BRI (ISDN Basic Rate Interface Line) TN556 and TN2198 circuit packs: ISDN-BRI station
endpoints, ASAI (Adjunct-Switch Application Interface) and Avaya adjuncts (for example
CONVERSANT
® Voice System). These circuit packs contain 12 ports of line circuit interfaces,
each of which operates at 192 kilobits per second (kbps) with two B channels and one D
channel. For BRI endpoints, each B channel may support voice or circuit-switched data and
may be circuit-switched simultaneously. The B channels are not used by ASAI or Avaya
adjuncts. The D channel is used for conveying signaling between the switch and a BRI
endpoint(s) or ASAI or Avaya adjuncts. Each ISDN-BRI D channel is connected to the switch
processor and the ISDN-BRI port through the PKT-BUS (packet bus).
ISDN-BRI endpoints come in a number of configurations. Every endpoint requires the D
channel to convey signaling information to the switch. A voice-only set requires only one B
channel. A voice and data-capable set requires both B channels (one for voice and one for
data). Therefore, each TN556 port can support either two voice-only sets or one voice and
data-capable set. Only a single ASAI or Avaya adjunct may be connected to an ISDN-BRI port.
Multiple adjuncts per line are not supported.
Figure 36: ISDN-BRI Set Interactions
on page 710 illustrates the physical connection (solid
line) between an ISDN-BRI circuit pack and a voice or voice/data set. Each physical connection
allows for two B channels, as stated above, plus one D channel. Each ISDN-BRI circuit pack
can support up to 12 of these PHYSICAL connections to different voice and voice/data sets or
ASAI and Avaya adjuncts.