Verilink PRISM 3002 (34-00277) Product Manual - Manual (Page 14)

2-2 I NSTALLATION
Port
Connections The front of the PRISM 3002 has one port connection: the Supervisory (SUPV),
discussed on page 2-3. The rear of the PRISM 3002 has three port connections:
DBU, NET, and Data Port as shown in Figure 2-1.
NET
(Network)
The network (NET) port provides connection to the network and contains an automatic
line build out (ALBO) allowing the unit to be located a substantial distance away from
the telco network interface with a receive signal level down to -27 dB.
The network interface LBO
level should be set as instructed
in section Line Parameters on
page 4 -15. Maximum suggested
cable lengths for the connection
from the unit to the network are
listed in Table 2-1. Calculations
are based on a 70
°
F cable
temperature, a 0.083-
µ
F /mile
capacitance, a 27- dB line loss,
and a 100-
Ω
, non-loaded,
twisted pair cable.
The network physical interface is a standard
RJ-48C 8 -pin modular jack. Table 2-2
displays the pinout assignments.
In accordance with FCC Rules, Part
68.218(b), notify the telephone company before disconnecting this product.
DBU
(Dial
Backup)
The Dial Backup 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 such as a Verilink PS500.
Table 2-3 displays the pinout assignments. See Dial
Backup Parameters on page 4-20 for more
information.
Table 2-1 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 2-2 Network Interface Pinout
Pin T1 NET Interface
1 Data In (Tip)
2 Data In (Ring)
3, 6 Not used
4 Data Out (Tip)
5 Data Out (Ring)
7, 8 Chassis Ground
Table 2-3 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
9 DCD In
10 Tx Clock In