Lucent Technologies Release 7 Manuel D’Utilisation
DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-642
DS1-FAC (DS1 Facility)
9
CRC
This field determines if CRC is enabled for all facilities on the TN1654 circuit
pack. The field is set to
pack. The field is set to
yes if a cyclic redundancy check (CRC) is to be
performed on transmissions that the board receives.
CRC is applicable only to E1 operation. Thus, this field appears on the fiber-link
form only for TN1654 DS1 CONV circuit packs whose bit rate is administered to
2.048 Mbps.
form only for TN1654 DS1 CONV circuit packs whose bit rate is administered to
2.048 Mbps.
DS1 CONV-1 and DS1 CONV-2 Line Compensation
The DS1 facility line signal is pre-equalized at the transmitter on the DS1 CONV
circuit pack so that DS1 line pulses have correct amplitude and shape when they
reach the Network Interface (see
circuit pack so that DS1 line pulses have correct amplitude and shape when they
reach the Network Interface (see
). The amount of equalization
necessary is determined by the distance to the Network Interface and also by the
type of wiring used to connect to the Network Interface. If the equalization is not
set to the correct value, potentially high error rates (errored seconds) will be
observed on the DS1 facility. Equalization values are determined as follows:
type of wiring used to connect to the Network Interface. If the equalization is not
set to the correct value, potentially high error rates (errored seconds) will be
observed on the DS1 facility. Equalization values are determined as follows:
Line compensation is applicable only to T1 operation, thus these fields will not
appear on the fiber-link form if the TN1654 DS1 CONV is administered for a bit
rate of 2.048 Mbps.
appear on the fiber-link form if the TN1654 DS1 CONV is administered for a bit
rate of 2.048 Mbps.
Line Coding
This field is used to administer the line coding for the DS1 facility. For the TN574
board and the TN1654 board in T1 mode, the field may be set to
board and the TN1654 board in T1 mode, the field may be set to
ami-zcs or b8zs.
If the TN1654 board is set for E1 operation, the line coding may be set to either
ami-basic or hdb3. The line coding must be the same at each end of the DS1
CONV Complex.
ami-basic or hdb3. The line coding must be the same at each end of the DS1
CONV Complex.
Framing Mode
Either
esf or d4 framing mode can be selected for the DS1 facility. The same
framing mode must be used at each end of the DS1 CONV Complex
For TN574 DS1 CONV boards, the framing mode field is administrable.
Equalizer
Setting
Setting
Distance to Network Interface (feet)
Cable type 22 AWG ABAM &
24 AWG PDS
Cable type 26 AWG PDS
1
1 to 133
0 to 90
2
133 to 266
90 to 180
3
266 to 399
180 to 270
4
399 to 533
270 to 360
5
533 to 655
360 to 450