NWK954

Expansion Port (Continued)

Signal

Pin no.

Type

Description

 

 

 

 

 

 

BPACTIN_N7

89

Digital input,

Backplane activity inputs. Indicate activity on up to 7

 

BPACTIN_N6

90

no pull-up

other hubs connected to the backplane. Received from the

 

BPACTIN_N5

91

 

backplane via external receivers. Each NWK954

 

BPACTIN_N4

92

 

connected to the local expansion bus receives all of these

 

BPACTIN_N3

101

 

backplane activity inputs. Unused inputs must be pulled

 

BPACTIN_N2

102

 

high or connected directly to DIGVDD. Inputs are sampled

 

BPACTIN_N1

103

 

on the rising edge of TXCLKIN.

 

 

 

 

 

 

BPDIE_N

107

Standard digital

Backplane data input enable. Enables the external

 

 

 

output and digital

receivers that pass backplane data and clock onto the local

 

 

 

input with pull-up

IRD[4:0] and BPCLK lines. Only one of the local NWK954s

 

 

 

 

is required to drive this signal, the others should be left

 

 

 

 

unconnected. This signal changes asynchronously.

 

 

 

 

Polarity defaults to active low but may be switched to

 

 

 

 

active high by adding an external 10kΩ pull-down.

 

 

 

 

 

 

BPDOE_N

108

Standard digital

Backplane data output enable. Enables the external

 

 

 

output and digital

drivers that pass the local IRD[4:0] and BPCLK signals

 

 

 

input with pull-up

onto the backplane. Output changes on the rising edge of

 

 

 

 

TXCLKIN. Only one of the local NWK954s is required to drive

 

 

 

 

this signal, the others should be left unconnected. Polarity

 

 

 

 

defaults to active low but may be switched to active high by

 

 

 

 

adding an external 10kΩ pull-down.

 

 

 

 

 

 

BPCLK

96

High drive open

25MHz backplane clock. Data transitions on IRD[4:0] are

 

 

 

drain digital output

synchronised to this clock. When another hub in the stack

 

 

 

and digital input

is sourcing data, this clock is received from the backplane

 

 

 

with pull-up

to all local NWK954s through an external receiver. When a

 

 

 

 

local NWK954 is sourcing data, BPCLK is supplied to the

 

 

 

 

backplane through an external driver. Requires external

 

 

 

 

pull-up for correct operation

 

 

 

 

 

 

BPCOL_N

95

High drive open

Backplane collision. This signal may be driven by any of

 

 

 

drain digital output

the local NWK954s to indicate that a collision has been

 

 

 

and digital input

detected, and is supplied to the backplane through an

 

 

 

with pull-up

external driver. Output transitions are synchronous to

 

 

 

 

the rising edge of TXCLKIN and the input is sampled on the

 

 

 

 

rising edge of TXCLKIN. Requires external pull-up for correct

 

 

 

 

operation.

 

 

 

 

 

 

BPCOLIN_N

104

Digital input,

Backplane collision input. Indicates that a collision has

 

 

 

no pull-up

been detected by any hub in the stack. Received from the

 

 

 

 

backplane via an external receiver. Connects to all local

 

 

 

 

NWK954s. Must be pulled high or connected directly to

 

 

 

 

DIGVDD if not used. Input is sampled on the falling edge of

 

 

 

 

TXCLKIN.

 

 

 

 

 

 

BPCOLOE_N

106

Standard digital

Backplane collision output enable. Enables the external

 

 

 

output and digital

driver that passes BPCOL_N onto the backplane. Only one

 

 

 

input with pull-up

of the local NWK954s is required to drive this signal, the

 

 

 

 

others should be left unconnected. Output changes on the

 

 

 

 

rising edge of TXCLKIN. Polarity defaults to active low but

 

 

 

 

may be switched to active high by adding an external 10kΩ

 

 

 

 

pull-down.

 

 

 

 

.

 

 

 

 

 

 

 

Table 5 (continued)

10

Page 10
Image 10
Mitel NWK954 manual Backplane data input enable. Enables the external, Backplane data output enable. Enables the external

NWK954 specifications

The Mitel NWK954 is a powerful, versatile networking device designed to meet the demands of modern communication systems. This device is tailored for businesses seeking robust networking capabilities while offering a suite of features that enhance connectivity and communication efficiency.

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