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| 型號(hào)： | PEB80900H |
| 英文描述： | ?Network Termination Controller? |
| 中文描述： | ？網(wǎng)絡(luò)終端控制器？ |
| 文件頁(yè)數(shù)： | 60/181頁(yè) |
| 文件大小： | 3288K |
| 代理商： | PEB80900H |
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PEB 80900
Part I
’
NTC-T
’
: Functional Description
Data Sheet
48
2001-04-02
3.4
S-Transceiver
Transmission over the S/T-interface is performed at a rate of 192 kbit/s. Pseudo-ternary
coding with 100 % pulse width is used. 144 kbit/s are used for user data (B1+B2+D),
48 kbit/s are used for framing and maintenance information. The NTC-T AM with NTC-
T functionality selected uses two symmetrical, differential outputs (SX1, SX2) and two
symmetrical, differential inputs (SR1, SR2). These signals are coupled via external
circuitry (
Figure 29
) and two transformers onto the 4 wire S-interface. The nominal pulse
amplitude on the S-interface is 750 mV (zero-peak).
3.4.1
Modes
In NT1 applications the S-transceiver is in NT mode.
However, if pins DDD = DDU =
’
0
’
(Auxiliary IOM-2 interface active) the timeslot and
state machine mode of the S-transceiver can be selected according to the application.
In todays intelligent NTs it is recommended to select the NT-state machine which
requires activation of the U-interface for completion of an S-bus activation. On the other
hand, if the intelligent NT allows internal calls it may be more convenient to use the LT-
S state machine. This state machine is typically used in PBX applications and allows
complete activation of the S-interface independently of the U-interface.
Pin ICS selects the timeslot of the S-transceiver as well as the default setting of the state
machine. The S-transceiver is mapped to IOM-2 channel 0 and uses the NT mode state
machine if ICS = 1. Otherwise, if ICS = 0, IOM-2 channel 1 is selected and the LT-S state
machine is applied.
The state machine can be toggled between LT-S and NT mode by programming the
internal registers of the S-transceiver. The internal registers are accessed via the
Monitor channel. Please refer to the data sheet of the PEB 8191 (INTC-Q) or the PEB
2081 (SBCX) manual for a description of the S-transceiver
’
s internal registers, the LT-S
state machine and the S/Q channel access.
The main functions of the S-transceiver are:
line transceiver functions for the S/T interface according to the electrical specifications
of ITU I.430 and ETSI ETS 300 012;
conversion of the frame structure between IOM and S/T interface;
conversion from/to binary to/from pseudo-ternary code;
level detection
receive timing recovery for point-to-point, passive bus and extended passive bus
configuration;
S/T timing generation using IOM timing synchronous to system;
D-channel echo bit generation by handling of the global echo bit;
activation/deactivation procedures, triggered by primitives received over the IOM C/I
channel or by INFO's received from the line;
execution of test loops.
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