Verilink PRISM 3111 (34-00242) Product Manual User Manual
Page 24
16
C
HAPTER
2: I
NSTALLATION
If the boot mode is set to Boot From Switches (S1-1=Dn) and you change any other
configuration switch, the unit will configure all possible parameters from the switch
settings.
SUPV Port Bit Rate
Switch S1-2 and S1 -3 set the supervisory port bit rate. This is a serial RS-232
DCE port configured for 8 bits, no parity, and 1 stop bit. Table 2-8 shows the
available speeds.
SLIP Port Bit Rate
Switch S1 -4 and S1- 5 set the SLIP port bit rate. This is a serial RS-232 DCE port
configured for 8 bits, no parity, and 1 stop bit. Table 2-9 shows the available
speeds.
Channel Assignment
Switch S1-6 selects the channel assignment mode for network T1 DS0s carrying
data to the high speed port. Contiguous channel mode (Dn) assigns the channels as
a block beginning at channel one for Data Port 1 and the first available channel for
Data Port 2, if installed. For example, if the high speed port data rate is to be 256
kbps (as defined by Switch S3), the unit assigns network channels one through
four to the high speed port.
Alternate (Up) channel mode assigns an idle channel following each data channel.
For example, data are carried on channels 1, 3, 5 and 7. Channels 2, 4, 6 and 8 are
idle (the idle setting is binary code 01111111). The advantage of alternate channel
assignment is that T1 ones density requirements are maintained by the idle
channels rather than placing any restrictions on the high speed data.
Data Port 1
Switch S1-7 sets the multiplier for the Data Port 1 input timing. The unit can
operate at any data rate that is a multiple of 56 or 64 kbps. Selecting N x 64K (Dn)
provides port bit rates that are multiples of 64 kbps. The ones density requirements
of the T1 network line must be ensured in this mode. Refer to the section entitled
Line Parameters on page 58 for more information. Selecting N x56K (Up) allows
Table 2-8 SUPV Port Bit Rate
S1-2
S1-3 SUPV
Port
Rate
Up
Up
1.2 kbps
Dn
Up
2.4 kbps
Dn
Dn
9.6 kbps
Up
Dn
19.2 kbps
Table 2-9 SLIP Port Bit Rate
S1-4
S1-5 SLIP
Port
Rate
Up
Up
1.2 kbps
Dn
Up
2.4 kbps
Dn
Dn
9.6 kbps
Up
Dn
19.2 kbps
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