MX-2100/2104
Installation and Operation Manual
Chapter 1 General Information
Application Considerations
1-49
The KML.8 module uses the HDB-3 line code. Jitter performance complies with
the requirements of ITU-T Rec. G.823. The module has two line interfaces: a
120
Ω
balanced interface, and a 75
Ω
unbalanced interface.
ISDN "S" Interface (Module KML.10/S)
The ISDN basic rate access "S" interface complies with ITU-T Rec. I.430. The
interface operates at a nominal rate of 192 kbps, and carries two B data channels
(nominal rate - 64 kbps), one D signaling channel (nominal rate - 16 kbps), and
additional framing and maintenance overhead data. The line coding is 2B1Q. The
line impedance is 100
Ω
. The user can select whether to connect or not the
internal line termination of the module.
ISDN "U" Interface (Module KML.10/U)
The ISDN basic rate access "U" interface complies with the ANSI T1.601 and ETSI
DTR/TM3002 standards. The line data rate is 160 kbps, and the line coding is
2B1Q. The utilization of the B and D channels is similar to that described above
for the KML.10/S module. The line impedance is 135
Ω
.
Fiber-Optic Link Interface (Module KML.F)
The fiber-optic link interface of the KML.F module uses a proprietary signaling
format which ensures optimum performance. To optimally meet a wide range of
system requirements, the fiber-optic interface can be ordered for operation over
62.5/125 micron multi-mode fibers (typical attenuation - 3.5 dB/km), as well as over
low-loss 9/125 micron single-mode fibers (typical attenuation - 0.4 dB/km).
Each option can be ordered with ST or FC-PC connectors; SMA connectors are
also available at 850 nm.
provides information on the characteristics of the optical interface.
Typical range is up to 4.5 km at 850 nm over multimode fiber, up to 45 km at
1300 nm over single-mode fiber with LED transmitters, up to 60 km with 1300 nm
laser transmitters, and up to 100 km with 1550 nm laser transmitters.
Table 1-4. KML.F Fiber-Optic Interface Characteristics
Wavelength Fiber
Type Transmitter
Type
Power
Coupled
into Fiber
Receiver
Sensitivity
Optical
Budget
Maximum
Receiver
Input
Power
Receiver
Dynamic
Range
850 nm
62.5/125
µ
m
multi-mode
LED
-18 dBm
-38 dBm
20 dB
-10 dBm
28 dB
1300 nm
9/125
µ
m
LED
-18 dBm
-40 dBm
22 dB
-12 dBm
28 dB
single-mode
Laser
-12 dBm
-40 dBm
28 dB
-12 dBm
28 dB
1550 nm
9/125
µ
m
single-mode
Laser
-12 dBm
-40 dBm
28 dB
-12 dBm
28 dB
