ATM Option System Reference - Comtech EF Data

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ATM Option 1.3.1 PowerCell in the ATM Network As we have seen from Figure 1-3, the proprietary PowerCell protocol can be used over an ATM network. • PowerCell allows for the convergence of voice, video, LAN and SNA traffic onto a single PVC. • Frames created by PowerCell are transmitted using ATM AAL5, and comply to the FRF.8 interworking standard. • The remote device must be another NetPerformer, which can be connected to either an ATM network or a Frame Relay network. PowerCell over ATM allows devices connected on either Frame Relay or ATM networks to interwork together via an FRF.8 compliant interworking device. The interworking device translates the Q.922 core to AAL5, but does not perform RFC-1483 to RFC-1490 protocol translation. Local IAD Remote IAD PowerCell Q.922 CORE PHY Q.922 CORE In ATMPVCR mode, the Explicit Forward Congestion Indicator (EFCI) and Cell Loss Priority (CLP) fields of the ATM cell are always set to 0. 1.3.2 AAL1 Circuit Emulation Services (CES) Figure 1-5: PowerCell Translation NOTE: AAL1 support is available on the SDM-9360, SDM-9380 and SDM-9585 running V9.1.0 or higher. AAL1 Circuit Emulation Services (CES) are used to carry 64 Kbps bearer channels at a constant bit rate (CBR) over ATM networks. CBR is required for carrying uncompressed voice, which is very sensitive to traffic delays. The services provided by AAL1 to the AAL user are: • Transfer of service data units with a constant source bit rate, • Delivery of these data units with the same bit rate, • Transfer of structure information between source and destination. 1-16 Memotec Inc. PHY I/W Device FRF.8 AAL5 PHY PowerCell AAL5 PHY
Product Overview The NetPerformer provides CBR through support of the structured DS1/E1 Nx64 Kbps service (where N represents the number of subchannels configured in the VC). • This is a fractional DS1/E1 service that supports structured AAL1 framing with CAS for either DS1 (D4 or ESF) or E1. • It does not support structured or unstructured framing without CAS signaling. • A maximum of 24 subchannels for all AAL1 VCs can be configured on the Net- Performer when using an E1 connection, or 20 subchannels for a T1 connection. AAL1 Voice Path The AAL1 voice path is similar to a passthrough voice channel in the sense that voice is not compressed (TDM) and no voice traffic is passed through the NetPerformer baseboard. During call setup, the Signaling Engine assigns a DSP to digit detection and tone generation. When the remote subchannel (or partner channel) is detected, the Signaling Engine allocates another DSP to process digit forwarding. Once call setup is complete, only the DSP assigned to the AAL1 subchannel is used. This DSP also handles echo cancellation. Digit Detection for AAL1 Incoming Calls: Incoming calls from AAL1 subchannels may be in predefined or switched mode. • The mode of an AAL1 subchannel is predefined if there is a user voice channel in predefined mode attached to this AAL1 subchannel. In this case, digits are passed. • The mode of an AAL1 subchannel is switched if there is no user voice channel in predefined mode attached to this AAL1 subchannel. In this case, digits are received and interpreted as for voice channels in a digital span. AAL1 Cell Coding The CES specification defines the concept of a block, which is one multiframe containing a fixed number of DS0 channels. • This block is fragmented into ATM cells. • If the block does not fit within a single cell, then the sequence of blocks is fragmented into multiple ATM cells with no space left unused in the cells. It is thus possible to have a cell containing the end of one block and the beginning of the next block. The AAL1 ATM cell structure includes: • Generic ATM header (5 bytes). • AAL1 header (1 or 2 bytes): - The first byte contains a one-bit flag (CSI) indicating whether the second byte is present, a 3-bit CRC, a parity bit and a 3-bit sequence number. Memotec Inc. 1-17
Page 1 and 2: ATM Option NetPerformer ® System R
Page 3 and 4: Contents Chapter 1: Product Overvie
Page 5 and 6: 4. 10 ILMI Channel VCI . . . . . .
Page 7 and 8: 5.8.1 ATM Adaptation Layer . . . .
Page 9 and 10: Product Overview 1 Memotec Inc. 1-1
Page 11 and 12: Product Overview and higher capacit
Page 13 and 14: 1.2.2 Error Checking 1.2.3 Cell Tra
Page 15 and 16: Product Overview • Another diffic
Page 17 and 18: 1.2.7 ATM Addressing Product Overvi
Page 19 and 20: NOTE: Service categories can be def
Page 21 and 22: 1.3 ATM Support on the NetPerformer
Page 23: Product Overview 7. Link to another
Page 27 and 28: Product Overview page 1-21). Howeve
Page 29 and 30: Product Overview - Congestion is de
Page 31 and 32: 1.3.5 PPP Over AAL5 Product Overvie
Page 33 and 34: AAL0 Adaptation Layer Product Overv
Page 35 and 36: Product Overview On the SDM-9360A,
Page 37 and 38: SVC Modes Supported Product Overvie
Page 39 and 40: Configuration 2 Memotec Inc. 2-1
Page 41 and 42: Configuration When you execute the
Page 43 and 44: Unit ID> (main prompt) Figure 2-1:
Page 45 and 46: SE/GLOBAL example: with ATM license
Page 47 and 48: Configuration Included in this calc
Page 49 and 50: SE/SLOT example: with data channels
Page 51 and 52: 2.5 Configuring the Digital Link Co
Page 53 and 54: 2.6 Configuring the ATM Channel Con
Page 55 and 56: 2.7 Configuring the ATM PVCs Config
Page 57 and 58: SE/PVC/ ATMPVCR example: on the SDM
Page 59 and 60: 2.7.2 PVC in AAL1 Mode SE/PVC/AAL1
Page 61 and 62: SE/PVC/ RFC1483 example Configurati
Page 63 and 64: 2.7.6 PVC in ATM-MULTIPLEX Mode SE/
Page 65 and 66: 2.8.1 SVC in ATMPVCR Mode SE/SVC/ A
Page 67 and 68: SE/SVC/ ATMPVCR example: ANSWER Typ
Page 69 and 70: 2.8.4 SVC in ATMPPP Mode SE/SVC/ AT
Page 71 and 72: 2.9 Configuration Examples Configur
Page 73 and 74: SE/PVC/#/ ATMPVCR example PVC Confi
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Monitoring and Statistics 3 Memotec
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Monitoring and Statistics NOTE: Vie
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Monitoring and Statistics SVC 1> Nu
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SVC Status Console SNMP SVC Status
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DSVC/ATM example Monitoring and Sta
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3.3 Status of ATM PVCs DC/PVC examp
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DE/PVC example Monitoring and Stati
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3.4 Viewing Reserved Channels DP/GL
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3.5 Status of ATM Channels DC/SLOT
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SE/SLOT/CHANNEL Configuration Param
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4.4 Scrambling function 4.5 UNI Ver
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4.8 ATM Signaling Channel VCI SE/SL
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SE/PVC Configuration Parameters 5 M
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SE/PVC Configuration Parameters Val
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5.3.3 Service category Values: SDM-
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5.3.6 Maximum burst size (MBS) in c
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SE/PVC Configuration Parameters NOT
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5.3.16 IP RIP SE/PVC Configuration
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5.3.20 OSPF face on both sides of t
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5.3.24 OSPF Hello interval 5.3.25 O
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5.3.29 IP multicast protocol 5.3.30
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5.3.34 Broadcast group SE/PVC Confi
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5.3.37 Cell Packetization SE/PVC Co
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SE/PVC Configuration Parameters of
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SE/PVC Configuration Parameters M-l
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5.4.12 TONE ON (ms) 5.4.13 TONE OFF
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5.4.16 Fwd digits SE/PVC Configurat
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5.5 FRF.8 Mode 5.5.1 Port 5.5.2 DLC
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SE/PVC Configuration Parameters •
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5.5.8 Frame relay DE bit 5.5.9 Fram
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5.6 RFC1483 Mode 5.6.1 BRG connecti
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5.8.2 Remote PVC number 5.8.3 Class
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SE/SVC Configuration Parameters 6 M
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6.3 ATMPVCR Mode 6.3.1 SVC Destinat
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6.3.7 Call Retry Delay 6.3.8 Peak c
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Index A AAL service classes 1-4 AAL
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IP RIP password 5-12 IP RIP TX/RX 5
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ATM Option 5
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ATM Option System Reference - Comtech EF Data

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