Lucent Technologies Inc.
Lucent Technologies Inc.
15
Preliminary Data Sheet
October 2000
T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator-II)
Functional Description
(continued)
The Lucent T7630 Dual T1/E1 Terminator (Terminator-
II) provides two complete T1/E1 interfaces each con-
sisting of a fully integrated, full-featured, short-haul line
interface transceiver and a full-featured primary rate
framer with an HDLC formatter for facility data link
access. The T7630 provides glueless interconnection
from a T1 or E1 analog line interface to devices inter-
facing to its CHI; for example, the T7270 Time-Slot
Interchanger or T7115A Synchronous Protocol Data
Formatter.
The line interface receiver performs clock and data
recovery using a digital phase-locked loop, thereby
avoiding false lock conditions that are common when
recovering sparse data patterns with an analog imple-
mentation. The receiver’s equalization circuit guaran-
tees a high level of interference immunity. The receive
line unit monitors the amplitude at the receive input for
analog loss of signal (ALOS) detection and the pulse
density of the receive signal for digital loss of signal
(DLOS) detection. The receive line unit may be pro-
grammed to detect bipolar violations. The line interface
unit may be optionally bypassed. It is recommended
that the LIU/framer interface be placed in dual-rail
mode, which allows the framers error/event detector to
detect and report code and bipolar violation (BPV)
errors.
The line interface unit’s transmit equalization is done
with low-impedance output drivers that provide shaped
waveforms to the transformer, guaranteeing template
conformance. The transmitter will interface to the digital
cross connect (DSX) at lengths up to 655 feet for DS1
operation, and line impedances of 75
or 120
for
CEPT-E1 operation. The transmit line unit monitors
nonfunctional links due to faults at the primary of the
transmit transformer and periods of no data transmis-
sion.
The line codes supported in the framer unit include
AMI, T1 B8ZS, per-channel T1 zero code suppression
and ITU-CEPT HDB3.
The T7630 supports T1 D4, T1DM, and SLC-96 SF,
ESF; ITU-CEPT-E1 basic frame; ITU-CEPT-E1 time
slot 0 multiframe; and time slot 16 multiframe formats.
The receive framer monitors the following alarms: loss
of receive clock, loss of frame, alarm indication signal
(AIS), remote frame alarms, and remote multiframe
alarms. These alarms are detected as defined by the
appropriate ANSI, AT&T, and ITUstandards.
Performance monitoring as specified by AT&T, ANSI,
and ITU is provided through counters monitoring bipo-
lar violation, frame bit errors, CRC errors, CEPT E bit =
0 conditions, CEPT Sa6 codes, errored events, errored
seconds, bursty errored seconds, severely errored sec-
onds, and unavailable seconds.
In-band loopback activation and deactivation codes
can be transmitted to the line via the payload or the
facility data link. In-band loopback activation and deac-
tivation codes in the payload or the facility data link are
detected.
System, payload, and line loopbacks are programma-
ble.
The default system interface is a 2.048 Mbits/s data
and 2.048 MHz clock CHI serial bus. This CHI interface
consists of independent transmit and receive paths.
The CHI interface can be reconfigured into several
modes: a 2.048 Mbits/s data interface and 4.096 MHz
clock interface, a 4.096 Mbits/s data interface and
4.096 MHz clock interface, a 4.096 Mbits/s data inter-
face and 8.192 MHz clock interface, a 8.192 Mbits/s
data interface and 8.192 MHz clock interface, and
8.192 Mbits/s data interface and 16.384 MHz clock
interface.
The signaling formats supported are T1 per-channel
robbed-bit signaling (RBS), channel-24 message-ori-
ented signaling (MOS), and ITU-CEPT-E1 channel-
associated signaling (CAS). In the T1, RBS mode voice
and data channels are programmable. The entire pay-
load can be programmed into a data-only (no signaling
channels) mode, i.e., transparent mode. Signaling
access can be through the on-chip signaling registers
or the system CHI port in the associated signaling
mode. Data and its associated signaling information
can be accessed through the CHI in either DS1 or
CEPT-E1 modes.
Extraction and insertion of the facility data link in ESF,
T1DM, SLC-96, or CEPT-E1 modes are provided
through a four-port serial interface or through a micro-
processor-accessed, 64-byte FIFO either with HDLC
formatting or transparently. In the T7630’s SLC-96 or
CEPT-E1 frame formats, a facility data link (FDL) is pro-
vided for FDL access. The bit-oriented ESF data-link
messages defined in ANSI T1.403-1995 are monitored
by the receive framer’s facility data link unit and are
transmitted by the transmit framer FDL
The receive framer includes a two-frame elastic store
buffer for jitter attenuations that performs control slips
and provides indication of slip directions.
Accessing internal registers is done via the demulti-
plexed/multiplexed address and data bus microproces-
sor interface using either the Intel 80188 (or 80X88)
interface protocol with independent read and write sig-
nals or the Motorola MC680X0 or M68360 interface
protocol with address and data strobe signals.