Section 311-580-20B
030-101527 Rev. B
5
0407IBRB
Figure 5.
3115-80 Detailed Block Diagram
FAC-to-CPE
Regen
OFF
ON
17
5
15
55
49
CT1
CR1
CPE Out
CT
CR
CPE In
7
13
T
R
TP1
TP2
GND
P201
SPAN
LOCAL
SPAN
P201
LOCAL
T1
R1
41
47
PWR
LB
FAC Out
FAC
MON
System
Controller And
PM Registers
Provisionable/
Self-Aligning
LBO
LB
Relay
10
Ω
LB
LB
CPE
MON
Power
Converter
LOCAL
SPAN
P201
TO CPE
FROM CPE
TO
FACILITY
FROM
FACILITY
RCV In
35
MAN
LB
LB1
LB1
LB1
Relay
Network
Loopback
CPE
Loopback
ESF
CPE-to-FAC
Regen
22.5 dB
15 dB
27
FRM GND
-V
OVER CURRENT
PROTECTION
Control
Code
Detector
Performance
Monitor &
LOS Detector
FLOS
AIS to CPE
Generator
LB
CPE LOS
(LB/AIS/Idle/RAI-CI)
Generator
0 dB
7.5 dB
AB15 dB
AB22.5 dB
OVER CURRENT
PROTECTION
OFF
ON
Performance
Monitor &
LOS Detector
CLOS
DB-9
Craft Port
PROTECTION
SURGE
PROTECTION
SURGE
LBO
15
7.5
0
B8ZS
If FAC IN level is 0dB and CPE IN level is 15dB, and the
Binder Level selection is set for 22.5dB, the LBO circuit
would adjust itself to 7.5dB.
3.2.2.5
The resulting signal is then output over the FAC OUT
port toward the Telco Facility. To facilitate circuit testing, a
front-panel bantam jack (CPE MON) provides monitor access
to the path.
3.3
Monitored Line Coding - AMI/B8ZS
The Monitored Line Code option determines if B8ZS octets and
8 consecutive 0’s are reflected in the Line Errored Seconds and
B8ZS Errored Second performance parameters. This option
does not effect the unit’s transmission path. When the Moni-
tored Line Coding is set for AMI, occurrences of 16 consecutive
0’s will be disregarded and occurrences of B8ZS octets will be re-
flected in the B8ZS Errored Count. When the Monitored Line
Coding is set for B8ZS, the front panel B8ZS LED is illuminated
(green) and occurrences of B8ZS octets will be disregarded and
occurrences of 8 consecutive 0’s will be reflected in the Line Er-
rored Seconds.
3.4
Monitored Framing - ESF/SF
The Monitored Framing option determines the framing refer-
ence that the performance monitoring (PM) section of the NIU
will use in it’s PM calculations. If the option is set for ESF", val-
id ESF-framing bits and CRC-bits are expected. Note, the
setting of this option does not affect the unit’s ability to pass sig-
nal. That is, if this option is set to "SF", the NIU shall still have
the ability to pass ESF framed signals AND inject NPRM’s into
the ESF data-link - despite the fact that the PM section will be
reporting Severe Errored Frame events due to the framing mis-
match (i.e. Monitored Framing = SF, Actual FACILITY
Framing = ESF). This option can be set remotely via TL1 or
16-bit commands or locally via the craft interface.
4.
LOOPBACK FEATURES AND OPTIONS
Loopback can be used during maintenance and circuit trouble-
shooting to verify the integrity of the Telco DS1 facility up to, and
including, the NIU. Loopback, when activated, loops the entire
DS1 payload from the receive facility back towards the transmit
facility. Also, when the unit is in loopback the front-panel Loop-
back LED (LB) will be on, and a loopback timeout circuit, if
