Schmid Watson Przewodnik Instalacji Strona 35

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LTU/NTU SZ-DOC-W5-1.pd
f
Operating Manual
V
ersion: 1.5
Revision: 2002-09-10 26
framed PRA -
frE1
Aligned fractional D2048S
mode
TS0 & TS16
always
transmitted
transparent E1 -
nx64
Unaligned D2048S mode, n
= 32
framed E1 -
nx64
Aligned fractional D2048S
mode
TS0 not
transmitted,
TS16 only if frE1
>= 16
framed E1-
frE1& nx64
Aligned fractional D2048S
mode
TS0 not
transmitted,
TS16 only if frE1
>= 16
TS0 always
transmitted,
TS16 only if frE1
> 16
TS0 not
transmitted,
TS16 always
transmitted
TS0 & TS16
always
transmitted
nx64 - nx64 Aligned fractional D2048S
mode for n<32
Unaligned D2048S mode
for n=32
Table 3-2: Time slot mapping overview
Notes:
Mapping rules & configuration apply for LTU & NTU separately!
Shaded areas: mapping mode determined by application
3.6 TMN Interface (Minirack LTU only)
The Telecommunication Management Network (TMN) is connecting the Management Center
(MC), Agent Elements (AEs) and Modems. Towards the MC the network is based on a X.25 or a
LAN connection. Between AE and modems this network is established by means of a serial,
asynchronous bus with differential (balanced) line transmission according to TIA/EIA-485
standard. Independent if the bus is set-up by a 2- or 4-wire connection the bus communication
between Common Management Unit (CMU) and the Line Termination Units (LTUs) is always
operating in half-duplex mode. The CMU is representing the Agent Element and is working as
bus master on the EIA-485 side. The LTUs are representing the modem and work as bus slaves
on the EIA-485 side.
3.6.1 TIA/EIA-485 4-wire Bus
The default TMN communication between Minirack versions of CMU and LTU is using a 4-wire
transmission with different pairs for receive and transmit direction.
This bus system requires a crossing of RX and TX signals between CMU and LTU.
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