Primary Rate Interface equipment: overview
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ISDN PRI Installation
ISDN Signaling Link hardware
Equipment required for shared mode.
— QPC757 DCHI or NT6D80 MSDL
— QPC720 PRI
— QPC471 or QPC775 Clock Controller
A Clock Controller is not needed for analog applications. Both QPC471
and QPC775 Clock Controllers cannot be in one system.
Equipment required for dedicated mode using leased lines.
— QPC757 DCHI or NT6D80 MSDL
— Modem set in synchronous mode
This equipment is required for dedicated mode using a DTI.
— QPC757 DCHI or NT6D80 MSDL
— QMT11 Asynchronous/Synchronous Interface Module (ASIM)
— QMT21 High Speed Data Module (HSDM)
— Meridian Communications Unit (X11 release 18 and later)
— Data line card
— QPC472 DTI
Equipment required for dedicated mode using a dial-up modem.
— QPC757 DCHI or NT6D80 MSDL
— Modem with auto-dial capability
Note:
This configuration is the least reliable because of lockup problems
inherent in smart modems from power splices and noisy lines. To
increase the reliability on this configuration, use a constant power source
when powering the modems. Also, verify that tie lines meet data grade
specifications. Northern Telecom takes no responsibility for ISL
D-channel outages due to modem lockup.
