Cabling and Connector Specifications
T1/PRI interface specifications
MAX TNT Hardware Installation Guide B-9
T1 RJ-48C-Loopback plug
The RJ-48C-Loopback plug loops the transmit signal back to the MAX TNT unit. Table B-8
shows the pinouts.
T1/PRI WAN connectors
Table B-9 lists the pins on the T1/PRI WAN port used for Transmit and Receive. The
remaining pins are not connected.
WAN switched services available to a MAX TNT unit
MAX TNT units are compatible with both AT&T and Northern Telecom central office
switches, and can access all T1/PRI switched digital services offered by AT&T’s ACCUNET
Switched Digital Services:
• MCI 56Kbps and 64Kbps services
• Sprint Switched 56Kbps and 64Kbps services
• MultiRate and GloBanD (and GVPN in CCITT countries) PRI network services
Note: MAX TNT units can only access Switched-56Kbps services on a T1 access line or a
Switched-56 line.
For a listing of the compatible switch types, see the Switch Type parameter listing in the
APX 8000/MAX TNT Reference. In addition to connecting to switched circuits, a MAX TNT
unit can connect to dedicated circuits and to aggregate dedicated and switched circuits.
Table B-8. RJ-48C-Loopback plug specifications
Pair # Signal Male RJ-48C
1 Receive 1 (connects to 5)
2 (connects to 4)
2 Transmit 5 (connects to 1)
4 (connects to 2)
Table B-9. Transmit and Receive pins
MAX TNT T1/PRI interface RJ-48C DTE
Receive (input) pair, Tip (T1)
Receive (input) pair, Ring (R1)
Position 2
Position 1
Transmit (output) pair, Tip (T)
Transmit (output) pair, Ring (R)
Position 5
Position 4
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