RS8953 Conexant Systems, Inc., RS8953 Datasheet - Page 20

• Manufacturer Part Number: RS8953
• Description: High-bit-rate Digital Subscriber Line (hdsl) Channel unit
• Manufacturer: Conexant Systems, Inc.

1.0 HDSL Systems
1.1 HTU Applications
1.1.5 Point-to-Multipoint
Figure 1-6. Point-to-Multipoint (Fractional) System Block Diagram
1-6
NOTE(S):
1. SCC = Serial Communications Controller
2. LAPD = Link Access Procedure D-Channel
3. AUX = Auxiliary HDSL channel attaches to payload or Z-bits
T1/E1
Full
SCC
Management Protocol
LAPD Signaling or
RS8953B
SCC
Figure 1-6
remote sites in a Point-to-Multipoint (P2MP) application. The number of HDSL
wire pairs and PCM channel rates at each site is variable. The RS8953B provides
the ability to measure and compensate for misalignment between separate PCM
frame syncs coming from each remote site. By programming transmit delays from
PCM to HDSL frame syncs, each remote site can send its HDSL frames back to
the central office. The HDSL frames are then sufficiently aligned with the others
to be reconstructed into a single PCM frame at the central site. The RS8953B
accommodates large differential delays associated with the P2MP application. It
receives HDSL frame offsets to groom Channel Associated Signaling (CAS)
from different sites.
different LAPD channels are received from each remote site. The RS8953B
provides auxiliary HDSL channel inputs and outputs for the system to externally
insert and monitor transmitted or received HDSL payload bytes. Auxiliary HDSL
channels may alternately be configured to terminate the last 40 Z-bits through an
external data link controller.
P2MP applications of primary rate ISDN transport are also supported, where
SCC
shows fractional T1/E1 services delivered from the CO to multiple
Optional
CH1
CH2
CH3
Conexant
CH1
CH1
CH1
RS8953B
RS8953B
RS8953B
RS8953B/RS8953SPB
Site A
Site B
Site C
HDSL Channel Unit
Partial
Partial
Partial
N8953BDSB
T1/E1
T1/E1
T1/E1