FMX 2
The flexible multiplexer FMX2R3.2 is a PCM30 system for building and extending flexible networks, and is suitable for linear, cascade and ring structures. It is intended mainly for use in corporate networks, but can also be used for subscriber-side termination of a V5.1/V5.2 access network.
Companies and administrations like railway operators and utilities operate corporate networks along oil or gas pipelines, railway tracks and radio links, which are used for monitoring and maintenance purposes. Due to the ongoing worldwide success of the Ethernet technology more and more control engineering components have been introduced with an Ethernet interface. FMX2R3.2 offers the possibility to use data interfaces based on Ethernet technology.
The FMX2R3.2 operates as terminal or drop/insert multiplexer for the following services:
- POTS, POTS with local batteryISDN-BA (S0, Uk0 with line code 4B3T or 2B1Q), also semipermanent
- Analog 2/4 — wire transmission as leased lines or with E&M signaling
- V.24/V.35/V.36/RS530 and X.21 data transmission with subrates up to 30/31 ﾴ 64 kbit/s, G.703 with 30/31 ﾴ 64 kbit/s
- Data transmission with up to 30/31 ﾴ 64 kbit/s via Ethernet 10/100Base-T.
The features and properties of the multiplexer correspond to ITU-T Recommendation G.797. In the transmission network direction, it implements up to two 2-Mbit/s interfaces according to ITU-T G.703/9. The signaling codes are transmitted using CAS (Channel Associated Signaling). As a special signaling variant, FA signaling is also available. Essential tasks of the multiplexer are:
- Multiplexing functions for speech and data signals.
- Provision of appropriate subscriber interfaces
- Control of subscriber interfaces with CAS or FA signaling.
The CAS code frame corresponds to ITU-T Recommendation G.704/5.1.3. Fig. 2.1 displays an example for an FMX2R3.2 corporate network:
Fig. 2.1 FMX2R3.2 Corporate Network
Fig. 2.2 shows the typical application scenario, if FMX2R3.2 is used for monitoring and controlling along an oil pipeline. The FMX2R3.2 elements along the pipeline provide Ethernet interfaces for data transport between Ethernet based sensors, valves or similar and the maintenance centre.
Multiplexer FMX2R3.2 can be accomodated as follows:
- up to 2 x in FMX2S (Flexible Multiplexer Shelf)
- up to 2 x in MXS19C (Multiplexer Shelf 19’’)
- in SNUS (Service Network Unit Shelf) in combination with the cross-connect multiplexer CMXC and the FastLink system module SMX1/4c
- in ONU 30 FTTB or
- in ONU 20 FTTO.
ONU 30 FTTB and ONU 20 FTTO each connect a multiplexer to the transmission net — work by means of a line termination unit (LTx). It is possible to cascade several ONUs or to operate two ONUs in a point-to-point connection for fixed analog or digital connections.
Network termination units which are connected to the multiplexer enable one or two data interfaces to access the subscriber directly. Network termination units for the basic access connect remote ISDN subscribers via Uk0 (4B3T or 2B1Q) to the multiplexer.
Fig. 2.4 Connecting the Network Termination Units to the Multiplexer
The multiplexer supports the following network termination units:
- Network termination unit NTU for interfaces in accordance with G.703 (64 kbit/s), V.24 (Subbit rates, 64 kbit/s), V.35, V.36, X.21 (subbit rates, 1 or 2 ﾴ 64 kbit/s), linked to the FMX2R3.2 via Uk0/2B1Q
- Network termination unit for basic access NTBA via Uk0 (4B3T/2B1Q).
Operating modes of FMX2R3.2
The FMX2R3.2 multiplexer supports the following applications:
- Operating modes, chosen from
— TMX2 ﾴ 30 terminal multiplexer, which contains two complete multiplexers
— DIMX drop-insert multiplexer, with which individual channels of a signal which is connected between the two 2-Mbit/s ports of the multiplexer can be tapped off and inserted
— TMX30(1+1) terminal multiplexer with 1+1 standby operation, which switches a
2-Mbit/s link to another on a fault
The transmission capacity of the multiplexer in the TMX2ﾴ30 and DIMX operating modes is 60 channels each with 64 kbit/s, and in TMX30(1+1) operating mode it is
30 channels. The assignment of timeslots to the two 2-Mbit/s ports is independent of the channel plug-in unit positions in the multiplexer. If no signaling is transmitted, up to 31 or 62 channels each with 64 kbit/s are available.
- Port-to-port connections for V.24, V.35, V.36, RS530 or X.21 interfacesEnd-to-end protection on n ﾴ 64-kbit/s level for analog 2-wire/4-wire interfaces (with or without E&M) and for V.24, V.35, V.36, RS530, X.21 interfaces
- Broadcasting for POTS with local battery, analog 2-wire/4-wire leased lines and all digital interfaces
- Ethernet layer 2 switchEthernet over TDM mirror
— Ethernet switch with 4 Ethernet ports and 1 or 2 TDM uplinks ports per module
— 2 modules per CPF2 possible
— TDM multiplexer as two times terminal or drop and insert mode
— Data rate at TDM: 1 up to 31 time slots per E1 port
— L2 switch support for multiple address data bases on a per port, for transparent router applications
— 4 Ethernet 10/100 PHYs according to IEEE802.3 and 802.3x
— Quality of service support with four traffic classes
— Flow control and back pressure
— automatic MDI/MDIX crossover
— CLI interface for link status and control, statistic counters
- Digital conference and point-to-multipoint operation
- Voice channel in common frequency radio networks
This application is realized using system modules FMX2R3.2 (with CUD and
UAC68) and CMXC, see also user manual UMN CMXC.
1+1 protection switching of n 64-kbit/s and 2-Mbit/s signals is not supported in this case.
- ﾷ IWU submodules of the CPF2 convert digital subscribers, which are connected at a given customer network with X.50/X.51 data structures, into one of the system-internal data structures V.110/X.30 or I.4601).
- Timer jobs for one or two complete channels over a maximum of two timeslots
- Software-controlled configuration, operation and operation monitoring
Suitable interfaces are present for connecting a local operating PC and for connecting to a TMN. Connected network termination units can be operated and monitored via the multiplexer.
Overview
The multiplexer includes the following units, see Fig. 2.5:
- A central unit drop/insert CUD
- Up to 6 line cards LC, of the following types:
— SUB102 subscriber converter, a/b wire, subscriber side
— SLX102 or SLX102E subscriber converter, a/b wire, switching side
— SLB62 subscriber converter for local battery, a/b wire
— UAC68 universal analog line card, 2/4-wire leased lines or with E&M
— SEM106C 2-wire E&M converter1)
— SEM108HC 4-wire E&M converter1)
— LLA102/104C line card for analog 2-wire/4-wire leased lines
— I8S0P ISDN line card, S0 interface
— IUL82C ISDN line card, Uk0 interface 2B1Q
— I4UK2NTP ISDN line card, Uk0 interface 2B1Q, switching side
— IUL84C ISDN line card, Uk0 interface 4B3T
— I4UK4NTP ISDN line card, Uk0 interface 4B3T, switching side
— DSC104C digital signal channel, 64 kbit/s, codirectional, G.703 interfaces
— DSC6-n64C digital signal channel, n 64 kbit/s, G.703 interfaces
— CPF2 digital signal channel
with maximum of 4 interface modules for
— subrates up to 31 ﾴ 64 kbit/s, V.24/V35/V36/RS530 or X.21 interfaces
— protocol conversion X.50/X.51 to X.30/V.110/I.460
with maximum of 2 interface modules, each interface module with
— 4 Ethernet 10/100Base-Tinterfaces
— CM64/2 (digital signal card, 2 Mbit/s channel multiplexer, G.703)
- Optionally a bus extension card BEC, if up to 12 line cards are connected to the CUD2).
The multiplexer is operated and monitored via the QD2 slave interface (QD2-S) of the central card, which is connected to a supervision unit.
1) only in MXS19C shelf and ONU 20 FTTO
