A-16 MAX TNT Hardware Installation Guide
Slot Card Specifications and Connection Information
Hybrid Access cards
Hybrid Access cards
Each ISDN call, and each channel of a dedicated session, requires a High-Level Data Link
Control (HDLC) channel to process the HDLC-encapsulated data received from or sent to a
WAN interface. Because the MAX TNT base system provides no HDLC resources, you might
need to install a Hybrid Access slot card in your unit. Keep in mind that the Series56 II and
Series56 III cards also provide up to 48 HDLC channels per slot card.
The following cards require HDLC channels:
• Eight-port E1 card
• Eight-port T1 card
• T3 slot card
The following cards do not require HDLC channels:
• DS3-ATM card
• DS3-ATM2 card
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