Verilink PRISM 3021 (34-00262) Product Manual - Manual (Page 35)

Terminal Operation 4-13 PRISM 3021
L INE P ARAMETERS
The Line Parameters screen (Figure 4 -13) allows reviewing
and setting line parameters for the selected element. This
screen has the following fields, most of which have user-
selectable options. To send the new line parameter to the
unit, either press ENTER on one of the fields, change the
Element selection, or exit the screen.
E1 -NET Framing: This field is used to select the type of
framing for the network side of the element as CCS CRC,
CCS, CAS, CAS CRC, and UNFRAMED.
E1 -NET Line Code: Sets the network side line coding as
either AMI or HDB3.
PRM Enable: This field allows the E1.403 Performance
Report Message, which is sent once a second, to be turned
on or off. The choices are ENABLE and DISABLE.
E1-National Bits: There are five national bits transmitted in
each E1 multiframe. The 3021 can use one of these bits to
create a data link between two units. The data link operates
at a rate of 4 kbps. Both endpoint units must have the same
bit selected. These bits may or may not be carried through
when the connection crosses service boundaries controlled
by different carriers. In cases where the bits are not carried
through, the remote communications channel option can be
used to communicate with the far-end unit (see Remote
Comm Channel below).
E1-NET Timing: Sets the timing source to synchronize the
unit’s internal timing.
Internal: The unit’s internal frequency standard is used for
all timing.
Port 1: Timing is synchronized to the external terminal tim-
ing clock supplied from the DTE and connected to the
selected port.
Verify that the external DTE clock is operating at
the data rate selected for Port 1.
Network: Timing is derived from the network recovered
clock (most applications use this selection).
E1-DTE: The unit synchronizes the clock recovered from
the E1 DTE port.
Station: Timing is derived from an external station clock.
When Station is selected, a field labeled Station Timing
appears directly below the E1-NET Timing with the fol-
lowing options:
64K x (number of channels), 2.048 MHz, 1.544 MHz, and
56K x (number of channels)
Figure 4-13 Line Parameters Screen
3021 DSU 1.00/1.01 P R I S M 3 0 2 1 Date: 03/15/96
No Far End Response Time: 13:52:43
-------------------------------- LINE PARAMETERS -----------------------------
E1-NET Framing: [CAS CRC ] Rem Comm Channel: ( 0)
E1-NET Line Code: [HDB3] E1-DTE Line Code: [HDB3]
PRM Enable: [ENABLE ] E1-DTE Channel: [8 ]
E1-National Bits: [Bit 1, SA4] Setting: [THRU]
E1-NET Timing: [Network ]
Channel Allocation: 1111111 DDDDDDDD SDDDDDDD DDDDDDDD
----------------------------------- Messages ---------------------------------