Contents xi
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Verification of PRI facility on the DMS-250 switch 10-8
PRI datafill verification 10-8
Interpreting PRI trunk states on the DMS-250 switch 10-8
Interpreting carrier states on the DMS-250 switch 10-10
Interpreting PRI DTCI states 10-12
Interpreting DCH states 10-13
Engineering recommendations 11-1
PRI configurations 11-1
Single DS-1 per PRI 11-1
Single PRI per DS-1 11-1
Usage of non-PRI channels on DS-1 11-1
D-channel handler to DS-1 mapping 11-1
Recommended D-channel handler to DS-1 mapping on DMS-250 DTCI 11-1
Optimal DS-1/D-channel handler card assignments on DMS-250 DTCI 11-2
Signaling terminals 11-2
DTCI port allocation 11-2
DS-1 card locations 11-2
Reliability considerations 11-3
Backup trunk group 11-3
Non-PRI trunks as backup 11-3
Multiple PRI links 11-3
DMS-250 switch loss and level datafill 11-3
DS-1 to DS-30 channel mapping 12-1
ETSI PRI 13-1
Introduction 13-1
Protocol—network mode 13-1
Protocol—user mode 13-2
Messages 13-3
Parameters 13-3
Message formats 13-4
Protocol timers 13-4
Hardware configuration 13-4
DTCOi+ overview 13-4
D-channel handler 13-5
Interworking 13-5
Call processing for ETSI PRI originations 13-5
Identifying call type 13-6
Pretranslation name determination 13-6
OTG and OSID 13-6
B-channel negotiation 13-8
Charge Number/Calling Party Number Delivery 13-8
ANSI PRI 13-11
Standard cause and treatment handling 13-13
VNET services 13-15
Access to NCS/DAP 13-15
Remote access 13-17
Supplementary/account codes 13-17
In-band digit collection—answer supervision 13-18
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