PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 186

• Manufacturer Part Number: PM5366-PI
• Description: HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
• Manufacturer: PMC-Sierra, Inc.

PRELIMINARY
DATASHEET
PMC-2010672
12.11 SBI Bus Data Formats
PROPRIETARY AND CONFIDENTIAL
STM-1/VC4 TUG3 or STM-1/VC3 otherwise no loopback data will get through.
The ingress data path is not affected by the telecom line loopback. This loopback
is only available for VT1.5/VT2/TU11/TU12 mapped tributaries. DS3 mapped
tributaries must use the DS3 line loopback. The Telecom bus line loopback mode
is shown diagrammatically in Figure 26.
Figure 26
The TEMAP-84 uses the Scaleable Bandwidth Interconnect (SBI) bus as a high
density link interconnect with devices processing T1s, E1s, DS3s, E3s,
transparent virtual tributaries and arbitary bandwidth payloads. The SBI bus is a
multi-point to multi-point bus capable of interconnecting up to four TEMAP-84
devices in parallel (if connected to a 77.76 MHz bus) with other link layer or
tributary processing devices.
Multiplexing Structure
The SBI structure uses a locked SONET/SDH structure fixing the position of the
TU-3 relative to the STS-3/STM-1. The SBI is also of fixed frequency and
alignment as determined by the reference clock (SREFCLK) and frame indicator
signals (SAC1FP and SDC1FP). Frequency deviations are compensated by
adjusting the location of the T1/E1/DS3/TVT1.5/TVT2 channels using floating
tributaries as determined by the V5 indicator and payload signals (SDV5, SAV5,
SDPL and SAPL). TVTs also allow for synchronous operation where
LDDATA[7:0]
LADATA[7:0]
LAC1J1V1
LDC1J1
LDDP
LDPL
LADP
LAPL
LAC1
- Telecom Line Loopback Diagram
ISSUE 1
Processor
Processor
Payload
Payload
VT/TU
VT/TU
VTPP
VTPP
174
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
Tributary
Path O/H
Tributary
Path O/H
Transmit
Receive
RTOP
TTOP
AND M13 MULTIPLEXER
PM5366 TEMAP-84