AVT Titan, Operator'S Manual

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1 – 2 1 040 7448 329657 (04.97) PC-SW 4.5
C H A P T E R 1 : S Y S T E M D E S C R I P T I O N
1.5.3.2 RS449 interface
The RS449 interface is implemented as a DTE and can be operated at data
rates from 56 kbit/s to 1920 kbit/s. The synchronisation is by loop timing. This
interface also requires that the data is switched en bloc, since there is no tran-
sit time compensation between the individual 64/56-kbit/s channels. The main
applications of this interface are satellite transmission and time-division multi-
plexing in company-internal networks.
Plug: RS449 (SUB-D 37pole)
Connect. Signal Electrical characteristics
1
SHIELD Shield Type: DTE
Data rate: 56 to 1920 kbit/s
Range: 100 m
Level: V.11, symmetrical
2
(SI) Signal rate indicator (n.c.)
3
not connected
4
SD a Send Data a
5
ST a Send Timing a = RT
6
RD a Receive Data a
7
RS a Request to Send a
8
RT a Receive Timing a = ST
9
CS a Clear to Send a
10
(LL) Local loopback (n.c.)
11
(DM a) Data mode (n.c.)
12
TR a Terminal Ready a
13
RR a Receiver ready a
14
(RL) Remote loopback (n.c.)
15
IC Incoming call
16
(SF/SR) Select freq./rate (n.c.)
17
TT a Transmit Timing a
18
(TM) Test mode (n.c.)
19
GND Signal ground
20
RC Receive common
21
not connected
22
SD b Send Data b
23
ST b Send Timing b = RT
24
RD b Receive Data b
25
RS b Request to Send b
26
RT b Receive Timing b = ST
27
CS a Clear to Send b
28
(IS) Terminal in service (n.c.)
29
(DM b) Data mode (n.c.)
30
TR b Terminal Ready b
31
RR b Receiver ready b
32
(SS) Select standby (n.c.)
33
(SQ) Signal quality (n.c.)
34
(NS) New signal (n.c.)
35
TT b Transmit Timing b
36
(SB) Standby indicator (n.c.)
37
SC Send common
DTE Data Terminal
Equipment
DCE Data Circuit Equipment
n.c. not connected