Quad Fast Ethernet Repeater Specification Sheet

ManualsBrandsMitel ManualsNetwork RouterNWK954

The NWK954 is a fully integrated, unmanaged, 4-port Fast

Ethernet Repeater conforming to the IEEE 802.3 100BASE-TX

Standard. The device integrates the 802.3 Repeater functions

with four 100BASE-TX PHY modules, enabling direct connection

to the isolation transformers with no additional PHY components.

It has built-in LED drivers for display of port activity and

network utilization. There is a local expansion port which allows

up to six NWK954s to be cascaded to form a 24-port repeater

with no additional components.

With the addition of simple backplane driver/receivers, up to

eight 24-port repeaters can be stacked.

The NWK954 is supplied in a 128-pin PQFP and interfaces

to the twisted pair media through 1:1 isolation transformers.

QUAD RJ45

QUAD

MAGNETICS

NWK954

QUAD

MAGNETICS

NWK954

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MAGNETICS

NWK954

QUAD

MAGNETICS

NWK954

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MAGNETICS

NWK954

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MAGNETICS

NWK954

CLOCK DRIVERS

OSCILLATOR

BACKPLANE BUFFERS

BACKPLANE CONTROLS

LOCAL EXPANSION BUS

Fig. 1 System block diagram

FEATURES

■ Compliant with IEEE 802.3 100BASE-TX Repeater

Unit Specification

■ Incorporates four IEEE 802.3 Compliant 100BASE-TX

Ports

■ Local Expansion Port for Cascading to 24 Ports

■ Stackable Backplane for Expansion up to 192 Ports

■ Link/Activity LED and Receive Error LED for each Port

■ Collision LED

■ Five LED Network Utilization Display

■ Base Line Wander Correction

■ Power Saving on Unused Ports

■ Driven from a Single 25MHz Clock

■ Single 5V supply

■ Low Power CMOS Technology

■ 128-pin PQFP package

ORDERING INFORMATION

NWK954D/CG/GH1N

NWK954

QUAD FAST ETHERNET REPEATER

PRELIMINARY INFORMATION

Supersedes January 1998 version, DS4842 - 1.1 DS4842-2.1 April 1998

Summary of content (16 pages)

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NWK954 QUAD FAST ETHERNET REPEATER PRELIMINARY INFORMATION Supersedes January 1998 version, DS4842 - 1.1 DS4842-2.1 April 1998 The NWK954 is a fully integrated, unmanaged, 4-port Fast Ethernet Repeater conforming to the IEEE 802.3 100BASE-TX Standard. The device integrates the 802.3 Repeater functions with four 100BASE-TX PHY modules, enabling direct connection to the isolation transformers with no additional PHY components. It has built-in LED drivers for display of port activity and network utilization.
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NWK954 Hub 7 Hub 6 Hub 5 Hub 4 Hub 3 Hub 2 Hub 1 Hub 0 OSCILLATOR BACKPLANE CONTROLS BACKPLANE BUFFERS CLOCK DRIVERS LOCAL EXPANSION BUS NWK954 NWK954 NWK954 NWK954 NWK954 NWK954 QUAD MAGNETICS QUAD MAGNETICS QUAD MAGNETICS QUAD MAGNETICS QUAD MAGNETICS QUAD MAGNETICS QUAD RJ45 Fig.
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128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 IRD3 IRD2 DIGGND2 DIGVDD2 P0_RXLED_N P0_ERLED_N P1_RXLED_N P1_ERLED_N P2_RXLED_N P2_ERLED_N P3_RXLED_N P3_ERLED_N ACTLED_N4 ACTLED_N3 ACTLED_N2 ACTLED_N1 ACTLED_N0 DIGGND3 DIGVDD3 COLLED_N BPDOE_N BPDIE_N BPCOLOE_N BPACTOUT_N BPCOLIN_N BPACTIN_N1 BPACTIN_N2 BPACTIN_N3 DIGGND4 DIGVDD4 IRD1 IRD0 NWK954 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 3
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NWK954 P0_TXOP P0_TXON IRD [4:0] P0_TXREF PORT 0 TRANSCEIVER LACTOUT_N LACTIN_N P0_RXIP P0_RXIN BPACTOUT_N BPACTIN_ N [7:1] BPDIE_N BPDOE_N EXPANSION PORT P1_TXOP BPCLK P1_TXON BPCOL_N P1_TXREF PORT 1 TRANSCEIVER BPCOLIN_N BPCOLOE_N P1_RXIP P1_RXIN REPEATER CONTROLLER P2_TXOP P2_TXON ACTLED_N [4:0] P2_TXREF PORT 2 TRANSCEIVER COLLED_N P2_RXIP P2_RXIN P0_RXLED_N P0_ERLED_N P1_RXLED_N P1_ERLED_N LED DRIVERS P3_TXOP P2_RXLED_N P3_TXON P2_ERLED_N P3_RXLED_N P3_TXREF PORT 3 TRANSCEIVER
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NWK954 Basic Repeater Function The Repeater Controller monitors activity on the 4 twisted pair ports and on the Expansion Port. When a packet is received on one of the twisted pair ports it is forwarded to the other 3 twisted pair ports and to the Expansion Port. When a packet is received on the Expansion Port it is forwarded to all 4 twisted pair ports.
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NWK954 7 5 BPACTIN_ N [7:1] LACTIN_N [5:1] LACTOUT_N BPCOLIN_N TXCLKIN BPCOL_N BPCLK 5 7 5 IRD [4:0] BPACTIN_ N [7:1] LACTIN_N [5:1] LACTOUT_N BPCOLIN_N TXCLKIN BPCOL_N BPCLK 5 7 5 IRD [4:0] BPACTIN_ N [7:1] LACTIN_N [5:1] LACTOUT_N BPCOLIN_N TXCLKIN BPCOL_N BPCLK 5 BACKPLANE DATA IRD [4:0] 5 7 5 BPACTIN_ N [7:1] LACTIN_N [5:1] LACTOUT_N BPCOLIN_N TXCLKIN BPCOL_N BPCLK 5 BACKPLANE CLOCK 7 5 IRD [4:0] BPACTIN_ N [7:1] LACTIN_N [5:1] LACTOUT_N BPCOLIN_N TXCLKIN BPCOL_N BPCLK 5 BACKP
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NWK954 The IRD bus in each hub is connected to the 5-bit backplane bus via a bidirectional buffer. This allows data to be driven from any hub to all other hubs in the stack. The bidirectional buffer is controlled by 2 control signals (BPDOE_N and BPDIE_N) which can be taken from any one of the NWK954 devices in the hub. BPDOE_N and BPDIE_N default to being active low but can be independently changed to active high by the addition of an external pull-down resistor, as shown in Fig.7.
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NWK954 100BASE-TX Receiver 100BASE-TX Transmitter The 100BASE-TX receiver recovers data from up to 140m of Cat5 UTP cable. Received data is decoded and descrambled and presented to the repeater controller as 5-bit symbols. The Transceiver Controller sequences the start-up of the receiver and does not allow data to be passed to the Repeater Controller until the receiver is fully initialized and a link is established and the descrambler is synchronized.
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NWK954 PIN DESCRIPTIONS Active low signals are denoted by the _N suffix; all other signals are active high Network Interface Signal Pin no.
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NWK954 Expansion Port (Continued) Signal Pin no. Description Type BPACTIN_N7 BPACTIN_N6 BPACTIN_N5 BPACTIN_N4 BPACTIN_N3 BPACTIN_N2 BPACTIN_N1 89 90 91 92 101 102 103 Digital input, no pull-up Backplane activity inputs. Indicate activity on up to 7 other hubs connected to the backplane. Received from the backplane via external receivers. Each NWK954 connected to the local expansion bus receives all of these backplane activity inputs. Unused inputs must be pulled high or connected directly to DIGVDD.
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NWK954 LED Drivers Signal Pin no. Description Type COLLED_N 109 Standard digital output Collision LED. Drives an LED to indicate that a collision has occurred either locally or elsewhere in the stack. P0_RXLED_N 124 Standard digital output Port 0 activity LED. Drives an LED to indicate link/activity on port 0. The LED is turned on when a link is established and flashes off when a packet is being received. P1_RXLED_N 122 Standard digital output Port 1 activity LED.
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NWK954 Power Signal Pin no.
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NWK954 POWER SUPPLY Recommended Operating Conditions apply except where otherwise stated Characteristic Supply voltage Supply current Value Symbol VDD IDD Min. Typ. Max. 4·25 5·25 400 Units Conditions V mA Includes current through external components(see Fig. 8) DC ELECTRICAL CHARACTERISTICS Recommended Operating Conditions apply except where otherwise stated Characteristic Value Symbol Typ. Max.
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NWK954 AC ELECTRICAL CHARACTERISTICS Recommended Operating Conditions apply except where otherwise stated TXCLK and RESET_N Characteristic Value Symbol Min. TXCLKIN Frequency Duty cycle Typ. 25 ± 100ppm fTCLK 45 RESET_N Pulse width tWRES Units - 100 Conditions Max. 55 MHz % - ns TXOP/TXON Characteristic Reference The differential output voltage shall be in the range 950mV to 1050mV. TP-PMD 9.1.2.2 The differential overshoot shall not exceed 5%. TP-PMD 9.1.
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NWK954 =VDD RXON3 70 R4 P3_TXREF P3_RXIN P3_TXGND2 P3_RXIP 74 R2 R1 73 R2 R1 C1 C2 RXOP3 69 RXOC3 59 R4 P2_TXREF P3_TXON 60 R4 R6 R6 66 C3 P1_TXREF C3 P0_TXREF P2_TXOP 28 63 TXIN2 R3 P0_TXGND2 P2_TXON 108 TXIC2 R3 62 BPDOE_N TXIP2 C1 C2 RXOC2 107 BPDIE_N P2_RXIP 56 R2 R6 TXIN3 R3 P1_TXGND2 TXIC3 38 27 R4 TXIP3 R3 P3_TXGND2 P3_TXOP 37 67 106 R1 1:1 MAGNETICS RXOP2 BPCOLOE_N P2_RXIN 55 R2 R1 RXON2 NWK954 VALOR ST6184 RXON1 P1_RXIN R5 42 R2 R1 41
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NWK954 PACKAGE DETAILS Dimensions are shown thus: mm (in). PIN 1 0° - 7° 0·13/0·20 (0·005/0·008) PIN 128 3·35/3·60 (0·132/0·142) 3·60/4·00 (0·142/0·157) PIN 1 IDENT 27·90/28·10 (1·098/1·106) SQ. 24·80 (0·976) 31·65/32·15 (1·246/1·266) NOM. 0·65/0·95 (0·026/0·037) 0·30/0·45 (0·012/0·018) 128 LEADS AT 0·80 (0·0315) NOM. SPACING 0·25/0·40 (0·010/0·016) NOTES 1. Controlling dimensions are millimetres. 2. This package outline diagram is for guidance only.