C-12 Preliminary November 4, 1998 MAX 4000 Series Hardware Installation Guide
Cables and Connectors
T1/PRI interface specifications
T1 RJ-48C-Loopback plug
This plug loops the transmit signal back to the MAX.
T1/PRI WAN ports
Table C-11 lists the pins on RJ-48C sockets on the MAX used for T1/PRI WAN interface. Only
pins 1, 2, 4, and 5 are used. The remaining pins are not connected.
WAN switched services available to the MAX
The MAX is 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 56 Kbps and 64 Kbps services
• Sprint Switched-56 (Kbps) and 64 Kbps services
• MultiRate and GloBanD (and GVPN in CCITT countries) PRI network services
Note: The MAX can access only Switched-56 Kbps services on a T1 access line or a
Switched-56 line.
For a listing of the compatible switch types, see the Switch Type parameter in the Reference
Guide for the MAX. In addition to switched circuits, the MAX can connect to nailed-up
circuits and to aggregate nailed-up and switched circuits.
Table C-10. 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 C-11. Transmit and Receive pins
MAX 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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