Verilink PRISM 3030 (34-00208.L) Product Manual - Manual (Page 39)

DTE Port Configuration 29
Port Rate
Multiplier
The unit can operate at any data rate that is a multiple of 56 or 64 kbps. If N
×
64K
is selected, the ones density requirements of the T1 network line must be ensured.
If N
×
56K is selected, ones density for the selected DS0 channel is maintained.
When set to DISABLE, the port is not used and no other configuration choices for
that port are available.
Port Rate The N parameter selects the required port bit rate in increments of 56 or 64 kbps,
depending on the selection in Port Rate Multiplier. The N multiplier ranges in
value from 1 to 24. For example, if N is 23 and the base rate is 64 kbps, the data
rate is 1472 kHz (64 kbps
×
23).
Starting
Channel
Number
Selects the starting channel in the 24 -channel DS1 bit stream. The unit
automatically assigns the channels that follow according to the bit rate and the
mode selected in DS0 Channel Assignment. If some channels are already
allocated, the starting channel is adjusted to the first block of idle channels that
matches the bandwidth to be mapped. The starting channel should be checked
before bandwidth is allocated.
DS0 Channel
Assignment
Selects whether the DTE channel assignment is made as a CONTIGUOUS group
or as ALTERNATE channels. Selecting ALTERNATE assures ones density.
Port
Transmit
Clock
Used to select the clock that the unit uses to sample the data transmitted from the
DTE. When set to INTERNAL, the data is sampled directly with the transmit data
clock that is also supplied to the DTE as Transmit Clock. The EXTERNAL option
uses the external clock from the DTE. The OVERSAMPLED 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 three times the asynchronous data rate (depending on the
degree of allowable distortion for the particular DTE equipment used).
Invert Data In the invert mode (YES), transmit and receive data are inverted at the port
interface. This function can be used to guarantee ones density when the data is
composed of SDLC-type protocols. The choices are YES and NO.
CTS /DSR /DCD
Control
Setting any of these three fields to FORCE TRUE or FORCE FALSE allows the
forcing of the port control lead output state. INTERNAL allows for normal
operation as shown in Figure 3-12 on page 30.