Verilink PRISM 3001 (34-00186) Product Manual - Manual (Page 18)

2-4 I NSTALLATION
Network Coding
Position S4-2 sets the network line coding to AMI or B8ZS.
Down: AMI Up: B8ZS
Network LBO
Positions S4 -3 and S4-4 set the line build out signal level of the transmit data
(TXD) from the unit to the network. The output level is factory set at 0 dB. It may
be attenuated by -7.5 dB, -15 dB, or -22.5 dB if operating conditions require that
it be changed. The telco should provide the proper setting to the user.
If unsure of
the exact setting, then leave it at the default value. The values are listed in the
following table.
Bit Rates
Position S4-5 works in conjunction with rotary switch S7 to set bit rate
configurations. Refer to Rotary Switch S7 on page 2-7 for further information. The
missing rates are N
×
56 and N
×
64, where N=15,17, 21, and 23. All 24 rate
configurations can be programmed through software control by using the NMS or
SUPV ports.
Clock Source
Positions S4 -6 and S4-7 determine the source of unit clocking. The most common
timing source for most CSU /DSU applications is to derive timing from the
network. The 3001 may also be optioned to time from an internal standard, from
the T1 DTE, or from the high-speed data interface as shown in Table 2-2.
Channel Assignment
Position S4-8 selects the channel assignment mode for network T1 DS0s that
carry data to the high-speed port. Contiguous assignment assigns the channels as a
block beginning at channel one. For example, if the high-speed port data rate is to
be 256 kbps (as defined by rotary switch S7 in on page 2-7), the unit would
assign network channels 1 through 4 to the high-speed port.
Table 2-1 Network Line Build Out
S4-3 S4-4 Network LBO
Down Down 0 dB
Up Down -7.5 dB
Down Up -15.0 dB
Up Up -22.5 dB
Table 2-2 Timing Source
S4-6 S4-7 Timing Source
Down Down Internal
Up Down Network
Down Up T1 DTE
Up Up high-speed port