Verilink PRISM 3030 (34-00208.L) Product Manual - Manual (Page 24)

14 C HAPTER 2: I NSTALLATION
The network interface LBO level should be set as instructed in Line Build Out on
page 25. Maximum suggested cable lengths for the connection from the unit to the
network are listed in the following table. Calculations are based on a cable
temperature of 70
°
F, 0.083
µ
F/mile capacitance, a 27-dB loss, and a 100-
Ω
,
non-loaded, twisted pair cable. PIC refers to Plastic Insulated Cable.
The network physical interface is a standard RJ-48C connector with the following
pinout assignments.
Network
Disconnection
In accordance with FCC Rules, Part 68.218 (b), the user must notify the telephone
company prior to disconnecting the unit.
Alarm
Connection Alarm conditions detected by the unit are conveyed at the isolated Alarm Relay
output contacts on the rear panel. NC (Normally Closed) and NO (Normally Open)
refer to the alarm contact’s relationship to C (Common) under a no alarms
condition.
Alarm connections are made to the terminal strip using a 22 -gauge stranded, or
similar wire. The Normally Closed alarm connects to NC & C. The Normally
Open alarm connects to NO & C. Contacts are rated at 0.6 amperes AC or 2.0
amperes DC. Alarm parameters are discussed in Alarm Parameters on page 64.
External Clock
Connection If the unit is to receive its timing source from a user supplied clock other than the
DTE or T1 lines, the Station Clock input must be connected on the rear panel.
This input is designed to accept TTL or bipolar signal levels. The station clock is
commonly available as a 64 kHz, bipolar RTZ signal referred to as a composite
clock.
The unit also accepts any unframed all ones bipolar RTZ signal with a level of 1.5
to 4 volts peak and a frequency of 1.544 MHz or any multiple of 56 or 64 kHz. An
RS-423 compatible station clock input, with the same range of input frequencies,
is also available as an option.
Table 2-7 Network Cable Characteristics
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
Table 2-8 T1 Net Connector Pinout
Pin T1 NET Interface
1, 2 Data In
3, 6 Not used
4, 5 Data Out
7, 8 Chassis Ground