Installation guide

LTU/NTU SZ-DOC-W5-1.pd
f
Operating Manual
V
ersion: 1.5
Revision: 2002-09-10 16
The detection of events and the state information are still valid as in normal PRA operation mode
(option 2).
Depending on the distribution of NT1 and LT functionality, two set-ups are possible for option 1:
• The master is E1 configured transparent, AIS-generation on and AIS-detection off; the slave
is PRA NT1 & LT, CRC4 processing off.
• The master is PRA LT with CRC4 processing off; the slave is PRA NT1 with CRC4 processing
off.
Note:
For proper operation in Option 1, the equipment at the customer side (NT2) and at the central
office side (ET) must be in CRC4 framed mode.
L
R
M
G
Local CRC error information
Remote CRC error information
CRC Monitor
CRC Generator
Optional
Mandatory
Digital Link
TV3'
M
G
G
M
NT2 ET
R
L
L
R
RX
TX
TX
RX
Figure 3-5: Digital Link without CRC Processing
3.3.2.2 Digital Link with CRC Processing in the NT1 (Option 2)
This is the usual PRA operating mode as described in ETS 300 233 and ITU-T Rec. G.962 Annex
B. The PRA interface is intended to be used in this mode.