
Preliminary Data Sheet
October 2000
T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator II)
176
L Lucent Technologies Inc.
Framer Register Architecture
(continued)
Automatic and Manual Transmission of E Bit = 0 Control Register
The default value of this register is 00 (hex).
Table 156. CEPT Automatic Transmission of E Bit = 0 Control Register (FRM_PR28) (67C; C7C)
* Whenever bits (e.g., Si, Sa, etc.) are transmitted from the system transparently, FRM_PR29 must first be momentarily written to 001XXXXX
(binary). Otherwise, the transmit framer will not be able to locate the biframe alignment.
Bit
0
Symbol
SIS
Description
Si-Bit Source.
In CEPT with NO CRC-4 mode, a 1 transmits TSiF and TSiNF in the Si
bit position to the line in FAS and NOT FAS, respectively. A 0, in non-CRC-4 mode, trans-
mits system Si data to the line transparently*.
Transmit One E = 0.
In CEPT with CRC-4 mode, a 0 transmits E = TSiF in frame 13 and
E = TSiNF in frame 15. A 1 transmits one E bit = 0 for each write access to TSiF = 0 or
TSiNF = 0.
Transmit Bit 1 in FAS.
In CEPT with no CRC-4, this bit can be transmitted to the line in
bit 1 of the FAS. In CRC-4 mode, this bit is used for E-bit data in frame 13.
Transmit Bit 1 in NOT FAS.
In CEPT with no CRC-4, this bit can be transmitted to the
line in bit 1 of the NOT FAS. In CRC-4 mode, this bit is used for E-bit data in frame 15.
Automatic Transmit E Bit = 0 for Received CRC-4 Errored Events.
A 1 transmits
E = 0 to the line whenever the receive framer detects a CRC-4 errored checksum.
ATELTS0MFA
Automatic Transmit E Bit = 0 for Received Loss of CRC-4 Multiframe Alignment.
A
1 transmits E = 0 to the line whenever the receive framer detects a loss of CRC-4 multi-
frame alignment condition.
ATERTX
Automatic Transmit E Bit = 0 on Expiration of CEPT CRC-4 Loss of Multiframe
Timer.
A 1 transmits E = 0 to the line whenever the receive framer detects the expiration
of either the 100 ms or 400 ms timer due to the loss of CRC-4 multiframe alignment.
—
These Bits Are Zero.
T1E
1
TSiF
2
TSiNF
3
ATERCRCE
4
5
6—7