Verilink PRISM 3111 (34-00242) Product Manual - Manual (Page 72)

64 C HAPTER 4: T ERMINAL I NTERFACE
maintained by the idle channels rather than placing any restrictions on the high
speed data but reduce the available bandwidth from 1.536 kbps to 768 kbps.
Start Channel #
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 DS0 Channel Assignment. The choices
are 1 through 24.
Port Rate
Pressing the <spacebar> increases the required port bit rate in increments of 56 or
64 kbps, depending on the Rate Multiplier setting. The Nx multiplier ranges in
value from 0 to 24.
# of Channels
This display-only field shows the number of channels to be passed through to the
DTE. The number is determined by the Port Rate value divided by the Rate
Multiplier.
Transmit Clock
This field is used to select the clock that the unit will use to sample the data
transmitted from the DTE. When set to Internal, the data is automatically
edge-aligned and sampled directly with the transmit data clock that is also supplied
to the DTE as Transmit Clock. The External option uses the external clock
supplied by DTE. The Oversample option is used to operate the port as a low
speed asynchronous port. In this mode, the port rate should be set to at least 4
times the asynchronous data rate (depending on the degree of allowable distortion
for the particular DTE equipment used).
LL Detect
The Local Loop Detect allows you to enable or disable pin J (V.35) or pin 18
(EIA-530) to loop-up the near (local) unit.
RL Detect
The Remote Loop Detect allows you to enable or disable the monitoring of pin BB
(V.35 ) or pin 21 (EIA-530) to loop-up the far unit.
V.54 Loop
Selecting Enable allows the unit to respond to inband V.54 loop codes. If you
select Disable, the unit ignores these codes.
Invert Data
In the invert mode (Yes), transmit and receive data are inverted at the port
interface. This function may be used as a means of guaranteeing ones density
when the data is composed of SDLC type protocols. The choices are Yes and No.