Verilink PRISM 3111 (34-00242) Product Manual - Manual (Page 21)

Port Connections 13
The network physical interface is a standard RJ-48C, 8-pin modular jack.
Table 2-5 displays the pinout assignments.
In accordance with FCC Rules, Part 68.218(b), you must notify the telephone
company prior to disconnecting this product.
DBU The Dial Back-Up (DBU) port provides an alternate path when the T1 network
interface service is disrupted or performance quality is degraded. This port is a
10-pin, RS-232 port that can connect, through a connector adapter, to a public
switched digital network (PSDN) device. Table 2-6 displays the pinout
assignments. See page 36 (front panel interface) or page 65 (terminal interface) for
information on DBU parameters and settings.
Table 2-4 Maximum Cable Lengths
Cable Type Loss per 1000' Max Cable Length
26-gauge PIC 6.8 dB 4,400 ft
24-gauge PIC 5.4 dB 5,500 ft
22-gauge PIC 4.2 dB 7,100 ft
19-gauge PIC 3.0 dB 10,000 ft
PIC - Plastic Insulated Cable
Table 2-5 Network Interface Pinout
Pin T1 NET Interface
1 Data In
2 Data In
3, 6 Not used
4 Data Out
5 Data Out
7, 8 Chassis Ground
Table 2-6 DBU Port Pinout
Pin Connection
1 Rx Clock In
2 DTR Out
3 RTS Out
4 Frame Ground
5 Data Out
6 Data In
7 Signal Ground
8 CTS In