ZyXEL Communications Multi-service Access Platform MSAP2000 - Manual (Page 61)

4. System Components
MSAP2000 Technical Manual V3.0 4-10
Current initiation, Voice Signaling transfer, and Tip-Ring Reversal
(Polarity Guard) for subscribers’ line. The FXO in the COT will
be associated with the FXS installed in the RT, to provide voice,
FAX, and modem dial-up services.
FXO-P
The FXO-P Module is installed within the COT Shelf, and provides
8 lines of 2-wire analog Payphone interfaces. FXO-P
automatically detects the charging signals sent from the Exchange
Station, and generates a corresponding charging signal on the RT
end, to initiate the Payphone’s charging mechanism. FXO-P
supports 12 KHz and 16 KHz charging signals (software
configurable) and battery reversal charging signal.
2W/4W E&M
The 2W/4W E&M Module (2W/4W Ear and Mouth Module)
provides 4 lines of 2-Wire or 4-Wire subscriber services. The dip
switch on the module can be used determine either a 2-wire or
4-wire setting. Both 2W and 4W interfaces conform to ITU-T
G.712 standards. E&M supports circuit status detection as well
as signaling, and its voice frequency gain is configurable by
software. E&M supports Type V and Transmit Only (TO) modes.
LUNT
Like NT1, LUNT works as a “Slave” Digital Subscriber Line
Transmitter. It is installed in the COT and connected to the
Exchange LT. LUNT receives 2B1Q DSL signals, and
multiplexes the signals into the 64 kbit/s timeslot channel of the
trunk interface. Each ISDN Module will occupy 3 64kbit/s trunk
interface timeslots. LUNT conforms to ITU-T G.797, ETSI ETR
080, and ANSI T1.601-1992 standards.
QE1M
QE1M provides 4 ITU-T G.703 E1 interfaces. QE1M can be
setup as the trunk interface module or the subscriber/network
testing module, via the LCT (Local Craft Terminal) or NMS.
QE1M can serve as the E1 interface for V5.2 Exchange Switch,
and it can also function as a Leased Line Network interface. As a
Leased Line Network interface, QE1M’s Grooming functions can
cross connect signals from the RT’s 2W/4W or E1 interface, at a
64 Kbit/s timeslot basis, to any E1 interface on the COT Network,
to form E1 signals. The same can be done for signals from
G.SHDSL GSH-R’s V.35 and E1 interface.
ETH
The ETH (Ethernet Interface Module) provides 10 Base-T and 100
Base-TX Auto-Negotiation Interfaces. ETH conforms to IEEE
802.3 Ethernet and IEEE 802.3u Fast Ethernet standard
regulations, and supports Full Duplex and Half Duplex
transmission. ETH provides Rate Limiting functions, and it can
support a transmission distance of up to 100 meters with Cat-5
UTP 10 copper cables. With a RJ-45 connector, its frequency
width can be configured to start at 1 Mbit/s, and increased up to 16
Mbit/s, at 1 Mbit/s per step. The final error rate is less than 10%.
The technologies used in ETH is the HDLC bit encapsulation and
ETH must be with another ETH or GSH + GSH-R (ETH interface)
to provide the leased line quality to the enterprise users.
EoSM
There are two kinds of the EoSM Modules namely the CEoSM and
REoSM. CEoSM and REoSM provide Ethernet over SDH
functions. They conforms to ITU-T G.7041 Generic Framing
Procedure (GFP), and also supports IEEE 802.3u 10 /100
Ethernet interfaces. One port is provided for one uplink in a pair of