參數(shù)資料
型號(hào)： TLIU04C1
英文描述： TLIU04C1 Quad T1/E1 Line Interface
中文描述： TLIU04C1四T1/E1線(xiàn)路接口
文件頁(yè)數(shù)： 63/100頁(yè)
文件大小： 1321K
代理商： TLIU04C1
Advance Data Sheet, Rev. 2
April 1999
TLIU04C1 Quad T1/E1 Line Interface
63
Lucent Technologies Inc.
Direct Logic Control Mode
(continued)
Pin Information
(continued)
Table 39. Pin Descriptions
(continued)
* I = input, O = output, I
u
indicates an input with internal pull-up; I
d
indicates an input with internal pull-down, P = power. Resistance value of all
internal pull-ups or pull-downs is 50 k
, unless otherwise specified.
Only one loopback mode can be enabled at a time. Enabling more than one results in all being deactivated.
Pin
Symbol
Type
*
Qty
Name/Description
137, 20,
65, 92
RND/
BPV[1—4]
O
4
Receive Data Negative Rail/Bipolar Violation.
If dual = 0 (single-
rail mode), this pin will be asserted (1 for ALM = 0, 0 for ALM = 1)
for one bit period after detection of a bipolar coding violation on the
receive analog data (RTIP RRING). If dual = 1, this pin is used as
the receive data negative rail.
Analog Loss of Signal (Active-Low).
This pin is asserted low
when the data signal at the receiver inputs falls below a threshold
level. The pin is deasserted high when the signal rises above
another, slightly higher threshold. The difference between these
threshold levels provides hysteresis to prevent alarm chatter.
Digital Loss of Signal (Active-Low).
Guarantees the receive
signal quality as defined in the appropriate ANSI, Bellcore, and ITU
standards. During DS1 operation, DLOS is asserted low if 100 or
more consecutive zeros occur in the receive data stream. In CEPT
operation, DLOS is asserted low when 255 or more consecutive
zeros occur in the receive data stream. The pin is deasserted high
when a ones density greater than 12.5% is detected over the 100 or
255 pulse positions.
Transmit Drive Monitor (Active-Low).
Transmit driver monitor
detects two conditions: a nonfunctional link due to faults on the
primary of the transmit transformer, and periods of no data
transmission. TDM = 0 for active alarm.
Loss of Transmit Clock (Active-Low).
LOTC = 0 when there is a
loss of any of the clocks in the transmit path including the TCLK
input, RCLK in remote loopback, jitter attenuator output clock (when
enabled), or the pulse-width controller clock.
Loss of XCLK.
This pin is asserted high when the XCLK signal is
not present.
Alarm Test Enable (Active-Low).
For ALMT = 0, alarm pins are
forced as follows; DLOS = 0, ALOS = 0, TDM = 0, LOTC = 0, and
BPV = activate state per ALM. LOXC is forced high if ALMT is
asserted for all four channels. ALMT does not affect data
transmission.
Full Local Loopback Enable (Active-Low).
This pin is cleared
for a full local loopback (transmit converter output to receive
converter input). Most of the transmit and receive analog circuitry is
exercised in this loopback.
Remote Loopback Enable (Active-Low).
This pin is cleared for a
remote loopback (DSX to DSX). In remote loopback, a high on
XAIS inserts the AIS signal on the transmit side.
Digital Local Loopback Enable (Active-Low).
This pin is cleared
for a digital local loopback. Only the transmit and receive digital
sections are exercised in this loopback.
6, 7, 78,
79
ALOS[1—4]
O
4
5, 8, 77,
80
DLOS[1—4]
O
4
4, 9, 76,
81
TDM[1—4]
O
4
3, 10, 75,
82
LOTC[1—4]
O
4
45
LOXC
O
1
144, 13,
72, 85
ALMT[1—4]
I
u
4
127, 30,
55, 102
FLLOOP[1—4]
I
u
4
126, 31,
54, 103
RLOOP[1—4]
I
u
4
125, 32,
53, 104
DLLOOP[1—4]
I
u
4
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