Multiple Services, Operation | ADTRAN 6530 instruction

Multiple Services

The NTU supports the configuration of multiple services. These services are routed to either the G.703/G.704 interface or the Nx64K interface. The Nx64K interface supports a single service with

1 <= N <= 36. The G.703 interface (with G.704 framing) supports multiple services (often termed “Stacked E1”). The G.703 interface without any framing supports a single 2048 kBit/s service. (See ITU-T G991.2 Annex. E.1-TPS-TC for European 2048 kbit/s digital Unstructured Leased Line (D2048U).)

The Nx64K service and G.703 service are capable of operating simultaneously. The total number of time slots must be less than or equal to the maximum number of SHDSL time slots (excluding TS0 if structured E1 is used). The G.703 interface with framing (G.704) runs over SHDSL in aligned mode and supports simultaneous services using the Nx64K port for the second service. (See ITU-T G991-2 Annex E.7 - TPS-TC for Aligned European 2048 kbit/s digital Structured Leased Line (D2048S) and Fractional.)

The SHDSL NTU supports CRC-4 detection/ generation toward the SHDSL network (Figure 22). The CRC-4 detection/generation can operate in the following modes (configurable via the management interface):

1.CRC-4 detection/generation disabled

2.CRC-4 detection/generation enabled

When less than 32 time slots are configured on the G.703 port, the NTU bases the CRC-4 detection/ generation on filling the unused time slots with a fixed pattern configurable via the management interface. This CRC-4 detection/generation is also required for multi-rate (single or simultaneous services) where less than 31 G.704 time slots are carried over the SHDSL line.

NOTE

All framed services operate in aligned mode.

Operation

The SHDSL NTU supports multiple rate line operation as specified in ITU-T G.991.2. All services described in this document operate in multiple rate mode, with a corresponding change in maximum payload. Unstructured E1 is supported for SHDSL rates equal to 32 and with all G.703 time slot assignments equal to the same G.703 service value (1 to 31).

The G.703 interface supports operation in the following modes that are selectable via the management interface:

1.Framed

2.Framed pass through

3.Unframed

Nx64K Service

SHDSL Time Slots

Nx64K Service (10x64K)

TS0

TS1

TS2

TS3

TS4

TS5

TS6

TS7

TS8

TS9

TS10

TS11

TS12

TS13

TS14

TS15

TS16

TS17

TS18

TS19

TS20

TS21

TS22

TS23

TS24

TS25

TS26

TS27

TS28

TS29

TS30

TS31

TS32

TS33

TS34

TS35

E1 Service (12x64)

E1 Service

Replace Nx64K Service TSs with an EOC defined pattern for CRC-4 calculations.

TS0

TS1

TS2

TS3

TS4

TS5

TS6

TS7

TS8

TS9