Verilink PRISM 3111 (34-00242) Product Manual - Manual (Page 42)

34 C HAPTER 3: F RONT P ANEL I NTERFACE
Framing
Selects the type of framing for the T1 DTE side of the element. The unit will
support ESF to D4 or D4 to ESF conversions. Selections are ESF and D4.
Ln Code
Sets the network side line coding as either AMI or B8ZS.
Level
Specifies the DTE line build-out signal level as either 0-110 ft, 111-220 ft,
221-330 ft, 331-440 ft, 441-550 ft, 551-660 ft, or >660 ft.
Chan Assign
Selects channels to be assigned to the T1 DTE from 1 through 24. For each
channel, you can select one of three values:
Idle - Channel is not allocated to the T1 DTE.
Thru - Channel allocated to T1 DTE.
T+Sig - Channel allocated to T1 DTE with signal insertion enabled for robbed bit
signalling mode.
Port 1 and Port 2
Params
These menus establish the necessary parameters for connection with Port 1 and
Port 2.
Rate
The unit can operate at any data rate that is a multiple of 56 or 64 kbps. When
N x64K is selected, the ones density requirements of the T1 network line must be
ensured. When Nx 56K is selected, the unit maintains ones density for the selected
DS0 channel.
Ch Asign
Selects whether the channel assignment will be made as a Cont (contiguous) group
or as Alt (alternate) channels. Alternate channel mode assigns an idle channel
following each data channel. For example, data is 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 but reduces the available bandwidth from 1.536 kbps to 768 kbps.
Start Chan
The starting channel in the 24-channel DS1 bit stream must be selected in this
field. The unit then assigns the following channels automatically according to the
bit rate multiplier and the mode selected in Ch Asign. The choices are 1 through
24.