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RELEASED
PM4354 COMET-QUAD
DATASHEET
PMC-1990315
ISSUE 6
FOUR CHANNEL COMBINED E1/T1/J1
TRANSCEIVER / FRAMER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMERS’ INTERNAL USE
56
In Transmit Clock Slave: Full T1/E1 mode, the backplane transmit interface is clocked by the
backplane transmit clock (BTCLK[x]). The transmitter is either frame-aligned or superframe-
aligned to the backplane transmit frame pulse (BTFP[x]). BTFP[x] is configurable to indicate the
frame alignment or the superframe alignment of BTPCM[x]. BTSIG[x] contain the signaling data to
be inserted into Transmit Data[x], with the four least significant bits of each channel on BTSIG[x]
representing the signaling state (ABCD or ABAB). BTCLK[x] can be enabled to be either a 1.544
MHz clock for T1 links or a 2.048 MHz clock for T1 and E1 links.
Figure 19:
- Transmit Clock Slave: Clear Channel
TJAT
FIFO
TRANSMITTER
Transmit Data[1:4]
BTCLK[1:4]
BTPCM[1:4]
TJAT
Digital PLL
Transmit CLK[1:4]
BTPCM[x] Timed
to BTCLK[x]
BTIF
Backplane
Transmit
System
Interface
In Transmit Clock Slave: Clear Channel mode, the backplane transmit interface is clocked by the
externally provided backplane transmit clock (BTCLK[x]). BTCLK[x] must be a 1.544 MHz clock
for T1 links or a 2.048 MHz clock for E1 links. The Transmit Clock[x] is a jitter attenuated version
of BTCLK[x].
Figure 20:
- Transmit Clock Slave: H-MVIP
CMV8MCLK
CMVFPC
MVBTD
CCSBTD
CASBTD
Inputs Timed
to CMV8MCLK
CMVFPB
TJAT
FIFO
T1-XBAS/E1-TRAN
BasicTransmitter:
Frame Generation,
Alarm Insertion,
Signaling Insertion,
Trunk Conditioning
Line Coding
TRANSMITTER
Transmit Data[1:4]
TJAT
Digital PLL
Transmit CLK[1:4]
BTIF
Backplane
Transmit
System
Interface
When Transmit Clock Slave: H-MVIP mode is enabled, a 8.192 Mbit/s H-MVIP backplane transmit
interface multiplexes up to 128 channels from 4 T1’s or E1’s, up to 128 Channel Associated
Signaling (CAS) channels from 4 T1’s or E1’s and Common Channel Signaling (CCS) from up to
4 T1’s or E1’s. The H-MVIP interface uses common clocks, CMV8MCLK and CMVFPC, and
frame pulse, CMVFPB, for synchronization.
The H-MVIP data signal, MVBTD, provides H-MVIP access to 128 data channels.
A separate H-MVIP signal, CASBTD, provides access to the Channel Associated Signaling (CAS)
for 128 channels. The CAS H-MVIP signal is time division multiplexed exactly the same way as