Verilink PRISM 3101 (34-00212) Product Manual - Manual (Page 14)

Installation 2-4 PRISM 3101/3102
linecoding of the network interface. ESF to D4 conversion
is supported.
NET
The Network interface connection contains an automatic
line build out (ALBO) allowing the unit to be located a sub-
stantial 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 the Line Parameters section on page 3-10. Maximum
suggested cable lengths for the connection from the unit to
the network are listed in Table 2-D. Calculations are based
on a cable temperature of 70
°
F, 0.083 uF /mile capacitance,
a 27 dB 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-E displays the pinout assignments.
In accordance with FCC Rules, Part
68.218(b), you must notify the tele-
phone 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 perfor-
mance 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 TxPORT
PS500. Table 2-F displays the pinout assignments. See page
3-13 for information on DBU parameters and settings.
Data Port Connections
The PRISM 3101 is equipped with either a V.35 port (on a
standard 34-pin connector) or with an EIA 530 port (on a
standard 25-pin DB-25 connector). The PRISM 3102 is avail-
able with either two V.35 ports or with two EIA 530 ports.
A standard EIA 530 to RS-449 conversion cable may be
used to adapt the DB-25 high speed port connection to 37-
pin RS-449 compatible data equipment. Pin functions for
both high speed port interfaces are listed in Table 2-G.
Default settings route all available DS0s to the T1 DTE port.
FCC rules require that interconnect-
ing cables carrying high speed data
be shielded appropriately in order to min-
imize radio frequency interference.
Table 2-C T1 DTE Pinout
Pin T1 DTE Interface
1 Data Out
2 Data Out
3,6 Not Used
4 Data In
5 Data In
7,8 Chassis Ground
Table 2-D 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-E 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-F 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
Table 2-G High Speed DTE Interface
Common Name
EIA 530
DB-25
V.35
34-pin
Frame Ground 1 A
Transmit Data 2, 14 P, S
Receive Data 3, 16 R, T
Request to Send 4, 19 C
Clear to Send 5, 13 D
Data Set Ready 6, 22 E
Signal Ground 7 B
Data Carrier Detect 8, 10 F
Transmit Clock 15, 12 Y, AA
Receive Clock 17, 9 V, X
Local Loopback 18 J
Data Term Ready 20, 23 H
Remote Loopback 21 BB
Terminal Timing 24, 11 U, W