PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 102

• Manufacturer Part Number: PEB2085
• Description: ISDN SubscribernAccess Controller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

2.5.9
The PEB 2086 offers the capability to control the start of the S-frame as well as the start of the
multiframe from external signals. Applications which require synchronization between different
S-interfaces are possible. Such an application is the connection of DECT base stations to PBX
line cards.
Figure 54
Multiframe Synchronization using the M-Bit
2.5.9.1
The CP-input can be used as S-frame trigger. Therefore, a 4 kHz signal must be applied.
If no signal is applied (CP = 0) the S-frames are triggerd internally.
2.5.9.2
The X2 pin can be used to synchronize the multiframe structure between several
S-transceivers. Multiframe generation must be enabled.
The value of X2 is sampled at the falling edge of CP or at the start of the F-bit of the S-frame
whatever occurs earlier.
If the input on X2 is "1", the multiframe counter is reset to frame no.1 and as a result, the M-bit
is transmitted as "1".
Semiconductor Group
M-Bit
S-Frame and Multiframe Synchronization (PEB 2086 only)
S-Frame Start (LT-S, NT mode)
Multiframe / Superframe Synchronization (LT-S, NT-Mode)
X2
PEB 2086
ISAC -S
TE
R
S-Interface
102
PEB 2086 CP
LT-S,NT
ISAC
Functional Description
R
-S
X2
ITS03735
M-Bit
4 kHz