Chapter 2 — Feature descriptions
Page 35 of 492
Option 11C
ISDN BRI Administration and Maintenance
The following describe the bearer capability encodings used by ISDN BRI
terminals that support TLINK protocol. Only calls originating from ISDN
BRI with these bearer capability encodings are allowed to terminate to a
MCA:
— 64k clear: Octet 3 = unrestricted digital information, octet 4 = 64 kbits/s,
no octet 5s are included.
— 64k restricted: Octet 3 = restricted digital information,
— octet 4 = 64 kbits/s, no octet 5s are included.
— 56k: Octet 3 = restricted or unrestricted digital information,
— octet 4 = 64kbits/s, octet 5 = v.110 and octet 5a = 56kbits/s.
ISDN BRI accessing ADM trunks
ADM trunk is not a trunk; it groups ADM devices in a route to allow an idle
ADM device defined in the given route to be searched or hunted easily when
the route access code is dialed. The Meridian Communication Unit (MCU)
may be defined as an ADM trunk with the MCU trunk as a subtype. Because
MCU can support TLINK protocol, an ISDN BRI terminal accessing this type
of ADM route is allowed to terminate to an idle device found in the route and
the conditions described for accessing MCA apply here. However, if the
ADM route is not an MCU trunk subtype, then ISDN BRI is blocked from
accessing the ADM routes because of incompatible protocols.
ISDN BRI terminals may access an ADM trunk that are not MCU subtype
under one condition: ISDN BRI terminals that support TLINK protocol can
access an ADM trunk if the circuit-switched data call is placed across an
ISDN PRI or DTI link. This access is possible because the ISDN PRI or DTI
pack provides protocol conversion from TLINK to DM-DM and vice versa.
ISDN BRI accessing ISDN PRI
The ISDN PRI interface supports three bearer capability encodings:
— 64k clear: Octet 3 = unrestricted digital information, octet 4 = 64 kbits/s,
no octet 5s are included.
— 64k restricted: Octet 3 = restricted digital information, octet 4 = 64
kbits/s, no octet 5s are included.
— 56k: Octet 3 = restricted or unrestricted digital information, octet 4 =
64kbits/s, octet 5 = v.110 and octet 5a = 56kbits/s.
Summary of Contents for Meridian 1 Option 11C
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Page 4: ...553 3011 311 Standard 7 0 May 1999...
Page 12: ...viii Contents 553 3011 311 Standard 7 0 May 1999...
Page 14: ...Page x About this guide 553 3011 311 Standard 7 0 May 1999...
Page 166: ...Page 152 of 492 Chapter 4 Network clocking 553 3011 311 Standard 7 0 May 1999...
Page 318: ...Page 304 of 492 Chapter 6 ISDN BRI trunk implementation 553 3011 311 Standard 7 0 May 1999...
Page 434: ...Page 420 of 492 Chapter 8 Service changes and maintenance 553 3011 311 Standard 7 0 May 1999...
Page 446: ...Page 432 of 492 Chapter 9 ISDN BRI traffic reports 553 3011 311 Standard 7 0 May 1999...
Page 492: ...Page 478 of 492 Appendix A 2Mb PRI implementation 553 3011 311 Standard 7 0 May 1999...